Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] aelu_v2_0.tar.gz(7881 Kbytes)|
|Manuscript Title: C++QEDv2Milestone 10: a C++/Python application-programming framework for simulating open quantum dynamics|
|Authors: Raimar Sandner, András Vukics|
|Program title: C++QED|
|Catalogue identifier: AELU_v2_0|
Distribution format: tar.gz
|Journal reference: Comput. Phys. Commun. 185(2014)2380|
|Programming language: C++/Python.|
|Computer: i386-i686, x86 64.|
|Operating system: In principle cross-platform, as yet tested only on UNIX-like systems (including Mac OS X).|
|RAM: The framework itself takes about 60MB, which is fully shared. The additional memory taken by the program which defines the actual physical system (script) is typically less than 1MB. The memory storing the actual data scales with the system dimension for state-vector manipulations, and the square of the dimension for density-operator manipulations. This might easily be GBs, and often the memory of the machine limits the size of the simulated system.|
|Keywords: Composite quantum systems, Open quantum systems, Quantum optics, Master equation, Quantum trajectories, Cavity quantum electrodynamics, Multi-array, Compile-time algorithms.|
|PACS: 03.65.Ta, 37.10.Vz, 01.50.hv, 02.70.-c.|
|Classification: 4.3, 4.13, 6.2.|
External routines: Boost C++ libraries, GNU Scientific Library, Blitz++, FLENS, NumPy, SciPy
Does the new version supersede the previous version?: Yes
Nature of problem:
Definition of (open) composite quantum systems out of elementary building blocks [2, 3]. Manipulation of such systems, with emphasis on dynamical simulations such as Master-equation evolution  and Monte Carlo wave-function simulation .
Master equation, Monte Carlo wave-function method
Reasons for new version:
The new version is mainly a feature release, but it does correct some problems of the previous version, especially as regards the build system.
Summary of revisions:
We give an example for a typical Python script implementing the ring-cavity system presented in Sec. 3.3 of Ref. :
Total dimensionality of the system. Master equation-few thousands. Monte Carlo wave-function trajectory-several millions.
Because of the heavy use of compile-time algorithms, compilation of programs written in the framework may take a long time and much memory (up to several GBs).
Depending on the magnitude of the problem, can vary from a few seconds to weeks.
|||Entry point: http://cppqed.sf.net|
|||A. Vukics, C++QEDv2: The multi-array concept and compile-time algorithms in the definition of composite quantum systems, Comp. Phys. Comm. 183(2012)1381.|
|||A. Vukics, H. Ritsch, C++QED: an object-oriented framework for wave-function simulations of cavity QED systems, Eur. Phys. J. D 44 (2007) 585.|
|||H. J. Carmichael, An Open Systems Approach to Quantum Optics, Springer, 1993.|
|||J. Dalibard, Y. Castin, K. Molmer, Wave-function approach to dissipative processes in quantum optics, Phys. Rev. Lett. 68 (1992) 580.|
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