├── README.md
├── images
├── favicon.ico
├── qutip-logo.png
├── wavefunction.png
├── research-word-cloud.png
├── numericalpython-cover.jpg
├── research-word-cloud-2.png
├── research-word-cloud-3.png
├── research-word-cloud-4.png
├── numericalpython-cover-ed3.jpg
└── theory-experiment-computation.png
├── css
├── main.css
├── bootstrap-theme.min.css
├── bootstrap-theme.css.map
└── bootstrap-theme.css
├── index.html
├── qdpack.html
├── qdpack_example.html
├── numericalpython.html
├── files
└── Robert-Johansson-RIKEN-Public.asc
├── computing.html
├── js
└── bootstrap.min.js
└── research.html
/README.md:
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1 |
2 | Repository for github web pages:
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4 | http://jrjohansson.github.com
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1 |
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5 | J Robert Johansson
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82 | A book about scientific and technical computing using Python. Source code listings are available in the form of IPython notebooks, which can be downloaded or viewed online.
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89 | Lectures on scientific computing with Python, computational quantum mechanics with Python, scientific computing projects (QuTiP, SymPsi, Wavefunction), and several other scientific-computing related projects.
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Physics research page, including publications, presentations, posters, and research related software.
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105 | Copyright © J Robert Johansson.
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QDpack - Quantum Dynamics Package
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22 | QDpack (Quantum Dynamics Package) is a free open-source software package (LGPL), implemented in C, for calculating the time-evolution of quantum systems. QDpack includes solvers for both unitary and dissipative dynamics, which can be applied to arbitrary quantum systems as long the total numbers of states is moderate (~100 to 300, depending on the stiffness of the problem). QDpack is a low-level C library. In order to solve a particular problem a C program needs to be created. A good starting point is one of the many examples that are included in the distribution tarball. It is often sufficient to create a new definition of a Hamiltonian to get started with a new calculation.
23 |
24 |
25 | Change Log
26 |
27 |
28 | 2010-10-01: qdpack 1.1: Added steady-state solver for driven systems, routines for calculating wigner and Q functions, minor bug fixes, sparse matrix support for steady state calculations.
29 | 2008-06-01: qdpack 1.0: First public release.
30 |
31 |
32 | Download
33 |
34 |
38 |
39 | Features
40 |
41 |
42 | Unitary evolution with arbitrary time-dependent Hamiltonians.
43 | Dissipative evolution using the Lindblad master equation formalism, with arbitrary time-dependent Hamiltonian.
44 | Evolution (unitary and dissipative) in time-dependent basis (i.e. instantaneous eigenbasis of a time-dependent Hamiltonian).
45 | Calculation of expectation values of arbitrary operators as a function of time.
46 | Calculation of steady state for time-independent systems.
47 | Calculation of two-time expectation values (correlation functions) of arbitrary operators as a function of time.
48 | Calculation of entanglement measures for two-level quantum systems.
49 | Pre-configured Hamiltonians:
50 |
51 | Coupled qubits (spin chains, etc.).
52 | Two-level system coupled to a single-mode harmonic oscillator (Jaynes-Cummings model).
53 | Multiple qubits (two-level system) coupled to a single-mode harmonic oscillator (Qubits coupled via a harmonic oscillator bus).
54 | Two coupled single-mode harmonic oscillators.
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56 |
57 |
58 |
59 | Build and install instructions for Ubuntu Linux
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61 |
62 | Requirements: CBLAS , CLAPACK , GSL and UMFPACK (for sparse matrices) . First install these packages. In Ubuntu Linux, run:
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64 | sudo apt-get install libblas-dev liblapack-dev
65 | sudo apt-get install libatlas-base-dev libatlas3gf-sse2
66 | sudo apt-get install libgsl0-dev libgsl0-dbg
67 | sudo apt-get install libf2c2 libf2c2-dev f2c
68 | sudo apt-get install libsuitesparse-dev
69 |
70 |
71 | Download and unpack the QD package tarball: tar zxfv qdpack-1.1.tar.gz
72 | Edit the Makefile. Make sure that the CFLAGS and LDLIBS correctly specifies the locations of the dependency libraries (i.e., BLAS, LAPACK, GSL, etc.).
73 | Run "make" to compile, and optionally "make install".
74 | Edit the simulation files run_qubits.c, run_ho.c, etc., compile and run a simulation by running e.g. "./run_qubits ...", etc. The simulation produces output files in "tab-separated values" (TSV) format which are stored in the "data" directory.
75 |
76 |
77 | Documentation
78 |
79 |
80 | To get started get started using the QD package
81 | have a look at this example , as well as the examples that are included in the source
82 | code distribution.
83 | Also, the QDpack source code is partially documented using Doxygen,
84 | which automatically generates API reference pages that can be found in the source code distribution.
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86 |
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89 |
90 | Copyright © Robert Johansson
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/qdpack_example.html:
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1 |
2 |
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4 |
5 | QDpack example - Coupled qubits
12 | QDpack example - Coupled qubits
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19 |
20 | This document describes how to use the QD package to calculate the dynamics of a simple quantum system. The example is a
21 | system of two coupled qubits that are initially in their ground states. An RF field is applied to the first qubit which
22 | gradually excite it (Rabi oscillations). The static interaction between the qubits cause energy exchange between the
23 | qubit once energy is pumped into the first qubit via the RF field. The example program is configured to output the
24 | occupation probabilities for each qubit.
25 |
26 |
27 | Model and parameter values
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29 |
30 | The model and parameter values used in this example are the following:
31 |
32 |
33 | Example source code
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37 |
38 | The example programs source code is available for download here , and it is also
39 | available in the QDpack source code distribution.
40 |
41 |
42 | Program structure
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44 |
45 |
46 | First the parameters for the Hamiltonian is configured by initializing a data structure of the type
47 | "solver_param".
48 |
49 |
50 |
51 | Next, a Hamiltonian is set up (either a new Hamiltonian is implemented, or one from the QDpack library
52 | is used).
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54 |
55 |
56 | The quantum system data structure is created and initialized, i.e., the number of quantum levels in
57 | each subsystem is configured.
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59 |
60 |
61 | Dissipation is configured: A list of operators and rates that appear in the master equation (OPTIONAL).
62 |
63 |
64 |
65 | Initial state is configured.
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67 |
68 |
69 | Finally, the solver is called. For each time-step the solver call a callback function where application
70 | specific processing of the density matrix at time t (extraction of occupation probabilites, calculation
71 | of expectation values, etc.) is be done.
72 |
73 |
74 |
75 | Build and run
76 |
77 |
78 | Build the example by typing "make run_qubits" in the QDpack directory. This will produce a executable file called
79 | "run_qubits". Run this program from the same directory, after making sure that the data output directory (data/qubit.dynamics)
80 | exists:
81 |
82 |
83 |
84 | $ mkdir -p data/qubit.dynamics
85 | $ time ./run_qubits
86 | Quantum system with 2 sub systems: 2 2
87 | DEBUG: combining (tensor product)
88 | DEBUG: combining (tensor product)
89 | DEBUG: starting dm_evolve_lme_t (Lindblad-type Master Eqaution)
90 |
91 | real 0m1.078s
92 | user 0m0.972s
93 | sys 0m0.108s
94 | $
95 |
96 |
97 |
98 | The program output is stored in the directory data/qubit.dynamics/ :
99 |
100 |
101 |
102 | $ wc data/qubit.dynamics/*
103 | 1001 3003 27028 data/qubit.dynamics/qubit_population_0.dat
104 | 1001 3003 27028 data/qubit.dynamics/qubit_population_1.dat
105 | 3003 9009 81084 total
106 | $
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108 |
109 |
110 | The occupation probabilities of each qubit is stored in individual files with and integer identifier in the file name. The
111 | data is formatted in the tab-separated values (TSV) ascii format, and column one to three is: 1) time, 2) probability to be in the
112 | ground state, and 3) probability of being in the excited state, respectively"
113 |
114 |
115 |
116 | $ tail data/qubit.dynamics/qubit_population_0.dat
117 | 9.910000 0.869513 0.130487
118 | 9.920000 0.869527 0.130473
119 | 9.930000 0.869539 0.130461
120 | 9.940000 0.869553 0.130447
121 | 9.950000 0.869568 0.130432
122 | 9.960000 0.869587 0.130413
123 | 9.970000 0.869608 0.130392
124 | 9.980000 0.869634 0.130366
125 | 9.990000 0.869666 0.130334
126 | 10.000000 0.869703 0.130297
127 | $
128 |
129 |
130 | Plotting results
131 |
132 |
133 | Plotting the results for the occupation probabilities for the three qubis gives the following figures:
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136 |
137 | $ enplot -x 0 -y 1,2 -X "time t (ns)" -Y "Occupation probabilities" -t "Occupation probability of qubit 1" -p qubit_1_populations.png data/qubit.dynamics/qubit_population_0.dat &
138 | $ enplot -x 0 -y 1,2 -X "time t (ns)" -Y "Occupation probabilities" -t "Occupation probability of qubit 2" -p qubit_2_populations.png data/qubit.dynamics/qubit_population_1.dat &
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141 |
145 | Figure caption: Left (top), the occupation probabilities of the first qubit. Fast oscillations are Rabi oscillations due
146 | to the RF driving. Slow oscillations are due to the static interaction with the second qubit. Right (bottom), the occupation
147 | probabilities of the second qubit. The oscillations are due to interaction with the first qubit. The gradual decay
148 | of oscillation visibility is due to dissipation in the second qubit (first qubit is dissipationless in this simulation).
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154 | Copyright © 2008 Robert Johansson
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Numerical Python
57 | Scientific Computing and Data Science Applications with NumPy, SciPy and Matplotlib
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65 |
66 |
68 |
69 | ISBN13: 979-8-8688-0412-0 (ebook 979-8-8688-0413-7)
70 |
71 |
72 |
73 | Author: Robert Johansson
74 |
75 |
76 |
77 | Publisher: Springer / Apress
78 |
79 |
80 |
81 | For more information, see the
82 | book's page on publisher's web site.
83 |
84 |
85 |
86 |
87 |
88 |
Summary
89 |
90 | Numerical Python by Robert Johansson shows you how to leverage the numerical and mathematical capabilities in Python, its standard library, and the extensive ecosystem of computationally oriented Python libraries, including popular packages such as NumPy, SciPy, SymPy, Matplotlib, Pandas, and more, and how to apply these software tools in computational problem solving.
91 |
92 |
93 |
94 | Python has gained widespread popularity as a computing language: It is nowadays employed for computing by practitioners in such diverse fields as for example scientific research, engineering, finance, and data analytics. One reason for the popularity of Python is its high-level and easy-to-work-with syntax, which enables the rapid development and exploratory computing that is required in modern computational work.
95 |
96 |
97 |
98 | After reading and using this book, you will have seen examples and case studies from many areas of computing, and gained familiarity with basic computing techniques such as array-based and symbolic computing, all-around practical skills such as visualisation and numerical file I/O, general computational methods such as equation solving, optimization, interpolation and integration, and domain-specific computational problems, such as differential equation solving, data analysis, statistical modeling and machine learning.
99 |
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202 |
203 | Copyright © J Robert Johansson.
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J Robert Johansson
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Scientific computing projects
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63 |
64 |
65 | QuTiP is an open-source python framework for simulating the dynamics of quantum systems.
66 | QuTiP is based on the excellent Numpy and Scipy numerical packages, and graphical output is provided by Matplotlib . QuTiP aims to provide user-friendly and efficient numerical
69 | simulations of a wide variety of quantum mechanical problems commonly found in physics applications in fields
70 | such as quantum optics, trapped ions, superconducting circuits, and quantum nanomechanical resonators.
71 |
72 |
73 |
74 | More information and documentation is available at the QuTiP web page , and at the
75 | QuTiP github repositories .
76 |
77 |
78 |
79 |
80 | is a Python package for calculating wavefunctions, energy levels, transition rates, etc., for 1 and 2 dimensional potentials. It includes examples for the harmonic oscillator, flux and current bias phase qubits, the Morse potential, and Flux qubits.
81 |
82 |
83 |
84 | More information and documentation is available at the
85 | github repository .
86 |
87 |
88 |
IPython extensions
89 |
90 | Various extensions for use with the IPython notebook.
91 |
92 |
93 |
94 | version_information : An IPython
95 | extension for showing version information for dependency modules. See the
96 | example notebook
97 | for installation and usage instructions.ipython-circuitikz :
99 | An IPython extension for generating and displaying electrical circuit diagrams in the
100 | IPython notebook, using LaTeX and the CircuiTikz package. There is an
101 | example notebook with installation and usage instructions.ipython-asymptote :
103 | An IPython extension for generating and displaying scientific figures in the
104 | IPython notebook, using the Asymptote vector graphics language. See the
105 | example notebook for details.
107 |
108 |
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110 |
Lectures on QuTiP
111 |
112 | A series of computationally-oriented lectures on quantum mechanics and quantum optics using QuTiP and iPython notebooks .
114 | The notebooks can be downloaded from the qutip-lectures github repository (ZIP ), or viewed online (read-only) using the links below.
115 | The following topics are covered:
116 |
117 |
118 |
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218 |
Symbolic quantum mechanics
219 |
220 | IPython notebooks on symbolic quantum mechanics with SymPy and SymPsi . The notebooks are available from the sympsi-notebooks repository at github, and can
221 | be view as static HTML pages via these links:
222 |
223 |
224 |
231 |
232 |
Wavefunction notebooks
233 |
234 | IPython notebooks with examples for the
235 | wavefunction python package.
236 | More examples are available in the
237 | github repository .
238 |
239 |
240 |
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248 |
249 |
250 |
251 |
252 |
253 |
Lectures on scientific computing with Python
254 |
255 | A series of lectures on scientific computing using python. The lectures are written as IPython notebooks, which means that you can interactively edit and run the code. Download the notebooks from the scientific-python-lectures github repository (ZIP ), or browse them online (read-only) using the these links:
256 |
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258 |
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299 |
300 |
Reproduced papers
301 |
302 | A collection of IPython notebooks with reproduced numerical results (to varying degree of detail) for some interesting
303 | papers. The notebooks are available for download at the
304 | reproduced-papers github repository, and
305 | can be previewed online using the following links:
306 |
307 |
308 |
309 | Orlando et al., Phys. Rev. B 60 , 15398 (1999) You et al., Phys. Rev. B 71 , 024532 (2005) Bose et al., Phys. Rev. A 56 , 4175 (1997) Schmidt et al., Phys. Rev. B 82 , 100507 (2010) Petersson et al., Nature 490, 380 (2012) Johansson et al., Phys. Rev. A 87 , 043804 (2013) Mirrahimi et al., SIAM JCO 46 , 445 (2007)
317 |
318 |
319 | See also
320 | reproduced-papers.github.io .
321 |
322 |
323 |
324 |
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326 |
327 |
328 |
329 |
330 |
331 | Copyright © J Robert Johansson.
332 |
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338 |
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1 |
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5 | J Robert Johansson
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J Robert Johansson, Ph.D.
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82 | Previously at the iTHES research group , RIKEN.
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Research
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195 | I work with theoretical and computational solid-state physics, with focus on quantum mechanics in superconducting electrical circuits. I have worked on qubits for quantum computing, artificial-atom and resonator circuits for on-chip atomic and quantum-optics-like physics in the microwave regime, and on quantum vacuum related phenomena, such as the dynamical Casimir effect.
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Publications
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205 |
206 |
207 | M.F. Gonzalez-Zalba, S.N. Shevchenko, S. Barraud, J.R. Johansson, A.J. Ferguson, F. Nori, and A.C. Betz
208 | Gate-Sensing Coherent Charge Oscillations in a Silicon Field-Effect Transistor ,
209 | Nano Lett. 16 (3) 1614–1619 (2016)
210 | [
211 | NanoLett ,
212 | PDF
213 | ]
214 |
215 |
216 |
217 | A.M. Zagoskin, A. Chipouline, E. Il'ichev, J.R. Johansson, F. Nori,
218 | Toroidal qubits: naturally-decoupled quiet artificial atoms ,
219 | Sci. Rep. 5 , 16934 (2015)
220 | [
221 | arXiv:1406.7678 ,
222 | SREP ,
223 | PDF
224 | ]
225 |
226 |
227 |
228 | G.-W. Deng, D. Wei, J.R. Johansson, M.-L. Zhang, S.-X. Li, H.-O. Li, G. Cao, M. Xiao, T. Tu, G.-C. Guo, H.-W. Jiang, F. Nori, and G.-P. Guo,
229 |
230 | Charge number dependence of the dephasing rates of a graphene double quantum dot in a circuit QED architecture,
231 |
232 | Phys. Rev. Lett. 115, 126804 (2015).
233 | [
234 | PRL ,
235 | PDF
236 | ]
237 |
238 |
239 |
240 | G.-W. Deng, D. Wei, S.-X. Li, J. R. Johansson, W.-C. Kong, H.-O. Li, G. Cao, M. Xiao, G.-C. Guo, F. Nori, H.-W. Jiang, G.-P. Guo,
241 | Coupling two distant double quantum dots to a microwave resonator ,
242 | Nano Letters 5 , 02400 (2015).
243 | [
244 | ACS NL ,
245 | PDF ,
246 | arXiv:1310.6118
247 | ]
248 |
249 |
250 |
251 | X.-Y. Lü, Y. Wu, J.R. Johansson, H. Jing, J. Zhang, F. Nori
252 | Squeezed Optomechanics with Phase-matched Amplification and Dissipation ,
253 | Phys. Rev. Lett. 114 , 093602 (2015)
254 | [
255 | PRL ,
256 | PDF ,
257 | arXiv:1412.2864
258 | ]
259 |
260 |
261 |
262 | E.-J. Kim, J.R. Johansson, F. Nori
263 | Circuit analog of quadratic optomechanics ,
264 | Phys. Rev. A 91 , 033835 (2015)
265 | [
266 | PRA ,
267 | PDF ,
268 | arXiv:1412.6869
269 | ]
270 |
271 |
272 |
273 |
274 | P. D. Nation, J. R. Johansson, M. P. Blencowe, A. J. Rimberg,
275 | Iterative solutions to the steady-state density matrix for optomechanical systems ,
276 | Phys. Rev. E 91 , 013307 (2015).
277 | [
278 | PRE ,
279 | PDF ,
280 | arXiv:1411.4356
281 | ]
282 |
283 |
284 |
285 | J.R. Johansson, G. Johansson, F. Nori,
286 | Optomechanical-like coupling between superconducting resonators ,
287 | Phys. Rev. A 90 053833 (2014).
288 | [
289 | PRA ,
290 | PDF ,
291 | arXiv:1403.4341
292 | ]
293 |
294 |
295 |
296 | J.R. Johansson, N. Lambert, I. Mahboob, H. Yamaguchi, F. Nori,
297 | Entangled-state generation and Bell inequality violations in nanomechanical resonators ,
298 | Phys. Rev. B 90 , 174307 (2014).
299 | [
300 | PRB ,
301 | PDF ,
302 | arXiv:1402.4900 ,
303 | Source code
304 | ]
305 |
306 |
307 |
308 |
309 | J.R. Johansson, G. Johansson, C.M. Wilson, P. Delsing, F. Nori,
310 | Nonclassical microwave radiation from the dynamical Casimir effect ,
311 | Phys. Rev. A 87 , 043804 (2013).
312 | [
313 | PRA ,
314 | PDF ,
315 | arXiv:1207.1988
316 | ]
317 |
318 |
319 |
320 |
321 | J.R. Johansson, P.D. Nation, F. Nori,
322 | QuTiP 2: A Python framework for the dynamics of open quantum systems ,
323 | Comp. Phys. Comm. 184 , 1234 (2013).
324 | [
325 | CPC ,
326 | PDF ,
327 | arXiv:1211.6518
328 | ]
329 |
330 |
331 |
332 |
333 | J. Stehlik, Y. Dovzhenko, J.R. Petta, J.R. Johansson, F. Nori, H. Lu, A.C. Gossard,
334 | Landau-Zener-Stückelberg interferometry of a single electron charge qubit ,
335 | Phys. Rev. B 86 , 121303(R) (2012)
336 | [
337 | PRB ,
338 | PDF ,
339 | arXiv:1205.6173
340 | ]
341 |
342 |
343 |
344 | J.R. Johansson, P.D. Nation, F. Nori,
345 | QuTiP: An open-source Python framework for the dynamics of open quantum systems ,
346 | Comp. Phys. Comm. 183 , 1760 (2012).
347 | [
348 | CPC ,
349 | PDF ,
350 | arXiv:1110.0573
351 | ]
352 |
353 |
354 |
355 | P.D. Nation, J.R. Johansson, M.P. Blencowe, F. Nori,
356 | Stimulating Uncertainty: Amplifying the Quantum Vacuum with Superconducting Circuits ,
357 | Rev. Mod. Phys. 84 , 1 (2012).
358 | [
359 | RMP ,
360 | PDF ,
361 | arXiv:1103.0835
362 | ].
363 |
364 |
365 |
366 | N. Lambert, J.R. Johansson, F. Nori,
367 | A macro-realism inequality for opto-electro-mechanical systems ,
368 | Phys. Rev. B 82 , 245421 (2011).
369 | [
370 | PRB ,
371 | PDF ,
372 | arXiv:1106.3138
373 | ].
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375 |
376 |
377 | C.M. Wilson, G. Johansson, A. Pourkabirian, M. Simoen, J.R. Johansson, T. Duty, F. Nori, P. Delsing,
378 | Observation of the dynamical Casimir effect in as superconducting circuit ,
379 | Nature 479 , 376 (2011).
380 |
381 |
382 | [
383 | Nature ,
384 | PDF ,
385 | Supplementary information ,
386 | arXiv:1105.4714 ].
387 | Quantum physics: Shaking photons out of the vacuum by D.A.R. Dalvit.
389 | [
390 | Nature ,
391 | PDF
392 | ].
393 | Physics World
394 | [PDF ]
395 |
397 |
398 |
399 |
400 | J.R. Johansson, G. Johansson, C.M. Wilson, F. Nori,
401 | Dynamical Casimir effect in superconducting microwave circuits ,
402 | Phys. Rev. A 82 , 052509 (2010).
403 | [PRA ,
404 | PDF ,
405 | arXiv:1007.1058 ].
406 |
407 |
408 |
409 | N. Lambert, Y. Chen, J.R. Johansson, F. Nori,
410 | Quantum chaos and critical behavior on a chip ,
411 | Phys. Rev. B 80 , 165308 (2009).
412 | [PRB ,
413 | PDF ,
414 | arXiv:0905.4794 ].
415 |
416 |
417 |
418 | J.R. Johansson, G. Johansson, C.M. Wilson, F. Nori,
419 | Dynamical Casimir effect in a superconducting coplanar waveguide ,
420 | Phys. Rev. Lett. 103 , 147003 (2009).
421 | PRL ,
424 | PDF ,
425 | arXiv:0906.3127 ].Synopsis in Physics
427 | [PDF ]. Selected as Editor's Suggestion.
428 |
429 |
430 | S. Ashhab, J.R. Johansson, A.M. Zagoskin, F. Nori, Single-artificial-atom lasing using a voltage-biased superconducting charge qubit , New J. Phys. 11 , 023030 (2009).
431 | [NJP ,
432 | PDF ,
433 | HTML ,
434 | arXiv:0803.1209 ].
435 |
436 |
437 | M. Grajcar, S. Ashhab, J.R. Johansson, F. Nori, Lower limit on the achievable temperature in resonator-based sideband cooling , Phys. Rev. B 78 , 035406 (2008).
438 | [PRB ,
439 | PDF ,
440 | arXiv:0709.3775v1 ].
441 |
442 |
443 | L.F. Wei, J.R. Johansson, L.X. Cen, S. Ashhab, F. Nori, Controllable coherent population transfers in superconducting qubits for quantum computing . Phys. Rev. Lett. 100 , 113601 (2008).
444 | [PRL ,
445 | PDF ,
446 | arXiv:0801.4417 ].
447 |
448 |
449 | J.R. Johansson, L.G. Mourokh, A.Yu. Smirnov, F. Nori, Enhancing the conductance of a two-electron nanomechanical oscillator , Phys. Rev. B 77 , 035428 (2008).
450 | [PRB ,
451 | PDF ,
452 | cond-mat/0702237 ].
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454 |
455 | Y.-X. Liu, L.F. Wei, J.R. Johansson, J.S. Tsai, F. Nori, Superconducting qubits can be coupled and addressed as trapped ions , Phys. Rev. B 76 , 144518 (2007).
456 | [PRB ,
457 | PDF ,
458 | cond-mat/0509236 ].
459 |
460 |
461 | A.M. Zagoskin, J.R. Johansson, S. Ashhab, F. Nori, Quantum information processing using frequency control of impurity spins in diamond , Phys. Rev. B 76 , 014122 (2007).
462 | [PRB ,
463 | PDF ,
464 | cond-mat/0703170 ].
465 |
466 | S. Ashhab, J.R. Johansson, A. Zagoskin, F. Nori, Two-level systems driven by large-amplitude fields , Phys. Rev. A 75 , 063414 (2007).
467 | [PRA ,
468 | PDF ,
469 | quant-ph/0702032 ]
470 |
471 | S. Ashhab, J.R. Johansson, F. Nori, Decoherence in a scalable adiabatic quantum computer, Phys. Rev. A. 74 , 052330 (2006).
472 | [PRA ,
473 | PDF ,
474 | quant-ph/0608212 ].
475 |
476 |
477 | A. M. Zagoskin, S. Ashhab, J.R. Johansson, F. Nori, Quantum two-level systems in Josephson junctions as naturally formed qubits , Phys. Rev. Lett. 97 , 077001 (2006).
478 | [PRL ,
479 | PDF ,
480 | cond-mat/0603753 ].
481 |
482 |
483 | S. Ashhab, J.R. Johansson, F. Nori, Rabi oscillations in a qubit coupled to a quantum two-level system , New J. Phys. 8 , 103 (2006).
484 | [NJP ,
485 | PDF ,
486 | cond-mat/0602577 ].
487 |
488 | S. Ashhab, J.R. Johansson, F. Nori, Decoherence dynamics of a qubit coupled to a quantum two-level system , Physica C, 444 , 45-52 (2006).
489 | [Physica C ,
490 | PDF ,
491 | cond-mat/0512677 ].
492 |
493 |
494 |
495 |
496 |
497 |
498 |
499 |
Preprints
500 |
501 |
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503 |
504 | G.-W. Deng, D. Wei, J.R. Johansson, M.-L. Zhang, S.-X. Li, H.-O. Li, G. Cao, M. Xiao, T. Tu, G.-C. Guo, H.-W. Jiang, F. Nori, G.-P. Guo,
505 | Circuit QED with a graphene double quantum dot and a reflection-line resonator ,
506 | arXiv:1310.6118 (2013).
507 | [
508 | arXiv:1310.6118
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Conference Proceedings
518 |
519 |
520 | For ISQM-TOKYO'08 , at Hitachi Research Laboratory, Tokyo Aug. 2008.Single-artificial-atom lasing and its suppression by strong pumping.
522 | [PDF ]
523 |
524 | For MS+S2006 at NTT Basic Research Laboratory, Hon-Atsugi 2006. Decoherence and Rabi oscillations in a qubit coupled to a quantum two-level system.
525 | PDF ,
527 | cond-mat/0604475 ].
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Software
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537 |
538 |
539 |
540 |
541 |
542 | P.D. Nation .
544 |
545 |
546 |
547 |
548 |
549 |
550 |
551 | wavefunction is a Python package for calculating wavefunctions, energy levels, transition rates, etc., for 1 and 2 dimensional potentials. It includes examples for the harmonic oscillator, flux and current bias phase qubits, the Morse potential, and Flux qubits.
552 |
553 |
554 |
555 |
556 |
557 |
560 |
561 |
562 |
563 |
564 |
565 |
566 |
567 |
570 |
571 |
572 |
573 |
574 | GSL extention
575 | A collection of functions that extend the Gnu Scientific Library (GSL), including conversion between real and complex matrices, exponential of complex-valued matrices (a Taylor-series implementation, and a generalization of the algorithm for real-valued matrices used in the GSL, i.e. the Moler and Van Loan algorithm), and calculation of eigenvalues and eigenvectors for complex-valued GSL matrices by using the ZGEEV LAPACK routine.
576 |
577 |
578 |
579 |
580 |
581 | MLIB
582 | A small stand-alone C library of math functions, including data structures and functions for polynomials, evaluation of Hermite polynomials, factorials, real-valued and complex-valued adaptive quadrature (integral evaluation).
583 |
584 |
585 |
586 |
587 |
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590 |
Talks and Lectures
591 |
592 |
593 |
594 |
595 | Simulating optomechanics with quantum nanoelectronics
596 | [PDF ] iTHES Colloquium , Jan 8th, 2015.
598 |
599 |
600 |
601 | Dynamical Casimir Effect and Entangled-Photon Generation in Superconducting Circuits
602 | [PDF ] Relativistic Quantum Information North 2014 , Korea, June 30 - July 4, 2014.
604 |
605 |
606 |
607 | Entangled-state generation in nanomechanical resonators and optomechanical-like coupling in microwave circuits
608 | [PDF ]
611 |
612 |
613 | Dynamical Casimir effect in superconducting circuits
614 | [PDF ] DTU , Denmark, Jan 31, 2014.
616 |
617 |
618 |
619 | Computational quantum dynamics with QuTiP
620 | [PDF ] DTU , Denmark, Jan 30, 2014.
622 |
623 |
624 |
625 | Scientific computing with Python
626 | [PDF ]DTU , Denmark, Jan 30, 2014.
628 |
629 |
630 |
631 | Circuit QED with a graphene double quantum dot and a reflection-line resonator
632 | [PDF ]
635 |
636 |
637 | Entangled-state generation and detection with multimode nanomechanical resonators
638 | [PDF ]
641 |
642 |
643 | Amplification of vacuum fluctuations and the dynamical Casimir effect in superconducting circuit
644 | [PDF ] Interdisciplinary mini-workshop on nonequilibrium physics
646 | at Kyoto University, Japan, Dec 7-8, 2013.
647 |
648 |
649 |
650 | Engineered quantum mechanics with nano-electronics
651 | [PDF ]
654 |
655 |
656 | QuTiP: Quantum Toolbox in Python, with circuit-QED applications Semiconductor Quantum Chip group, at USTC
658 | in Hefei, China, June 27th, 2013.
659 |
660 |
661 |
662 | Scientific computing with Python [Notebooks ] Chalmers in Göteborg, Sweden, December 5 - 12, 2012.
664 |
665 |
666 |
667 | Dynamical Casimir effect in superconducting circuits
668 | [PDF ] Particle Physics Theory Group at Osaka University, November 27, 2012.
670 |
671 |
672 |
673 | Frequency-tunable resonators and the Dynamical Casimir effect in microwave circuits
674 | [PDF ] Lecture on QuTiP: Quantum Toolbox in Python with case studies in Circuit-QED
676 | [PDF ] The 25th Workshop on Nanoscale and Mesoscopic Systems
678 | in Pohang, Korea, November 1-2, 2012.
679 |
680 |
681 |
682 | Dynamical Casimir effect in superconducting circuits
683 | [PDF ] QuLink seminar
685 | at NII in Tokyo, Japan, October 22, 2012.
686 |
687 |
688 |
689 |
690 | QuTiP: Quantum Toolbox in Python
691 | [PDF ] SciPy 2012, Scientific Computing with Python
693 | in Austin, USA, July 16th - 21st, 2012.
694 |
695 |
696 |
697 | Popular science lecture on Research with supercomputers
698 | [PDF ].
701 |
702 |
703 | Dynamical Casimir effect in superconducting circuits
704 | [PDF ] New trends in the physics of the quantum vacuum: from condensed matter, to gravitation and cosmology
706 | in Trento, Italy, June 27th to July 1st 2011.
707 |
708 |
709 |
710 | Quantum vacuum amplification in superconducting circuits
711 | [PDF ] International Workshop on the Dynamical Casimir Effect in Padova, Italy, June 6th to 8th 2011.
713 |
714 |
715 | Dynamical Casimir effect in a coplanar waveguide .
716 | PDF ].
718 | PDF ].
720 | PDF ].
722 |
723 |
724 | Single-artificial-atom lasing .
725 | [PDF ].Quantum Computing workshop at the ITAMP institute at Harvard University, Boston, Oct 6-17, 2008.
727 |
728 | Single-artificial-atom lasing (see above) .
729 |
730 | Dynamics of a superconducting qubit coupled to quantum two-level systems in its environment .
731 | [PPT ].
733 |
734 | Decoherence in adiabatic quantum computing .
735 | [PDF ]
736 |
737 | Dynamics and decoherence of a qubit coupled to a two-level system .
738 | [PDF ]
739 |
740 |
741 |
742 |
743 |
762 |
763 |
764 |
Thesis
765 |
766 |
767 | My Ph.D. thesis on "Quantum mechanics in superconducting circuits and nanomechanical devices"
768 | [PDF ] was defended on Oct. 2nd, 2009.
769 | My supervisors were by Prof. Göran Johansson at Chalmers University of Technology, and Prof. Franco Nori at RIKEN.
770 |
771 |
772 |
773 |
774 |
775 |
Posters
776 |
777 |
778 |
779 | QuTiP: The quantum toolbox in python
780 | [PNG ] FIRST annual meeting at U. Tokyo, Dec. 2013.
782 |
783 |
784 |
785 | Nonclassical microwave radiation from the dynamical Casimir effect ICQIT 2013 at NII in Tokyo, Jan. 2013.
787 |
788 |
789 |
790 | Dynamical Casimir effect in a superconducting coplanar waveguide ,
793 |
794 |
795 | Dynamical Casimir effect in a superconducting coplanar waveguide ,
798 |
799 |
800 | Photon generation in superconducting transmission lines using Josephson-junction devices ,Nobel Symposium - Qubits for Future Quantum Computers , Gothenburg, Sweden, May 2009.
802 |
803 |
804 |
805 | Single-artificial-atom lasing using a voltage-biased superconducting charge qubit ,ISNTT 2009 , at NTT Basic Research Laboratory, Hon-Atsugi, Jan. 2009,
809 |
810 |
811 | Artificial-single-atom lasing and its suppression by strong pumping , ISQM-TOKYO'08 , at Hitachi Research Laboratory, Tokyo, Aug. 2008.
813 |
814 |
815 |
816 | Dynamics and decoherence of a qubit coupled to a two-level system , MS+S2006 at NTT Basic Research Laboratory, Hon-Atsugi, Feb. 2006.
818 |
819 |
820 |
821 |
822 |
823 |
824 |
825 |
826 |
827 |
828 |
829 | Copyright © J Robert Johansson.
830 |
831 |
832 |
833 |
834 |
835 |
20 |
21 | 
34 |
35 | 
142 | 
143 |
144 | 
wavefunction 
133 | 
422 | 
423 | [
