# Singular perturbations and Lindblad-Kossakowski differential equations

06 09 Category : Quantum systems | All

Authors: M. Mirrahimi, P. Rouchon

IEEE Trans. Automatic Control. Vol 54 (6), pp:1325 - 1329, 2009 DOI: 10.1109/TAC.2009.2015542

We consider an ensemble of quantum systems whose average evolution is described by a density matrix, solution of a Lindblad-Kossakowski differential equation. We focus on the special case where the decoherence is only due to a highly unstable excited state and where the spontaneously emitted photons are measured by a photo-detector. We propose a systematic method to eliminate the fast and asymptotically stable dynamics associated to the excited state in order to obtain another differential equation for the slow part. We show that this slow differential equation is still of Lindblad-Kossakowski type, that the decoherence terms and the measured output depend explicitly on the amplitudes of quasi-resonant applied field, i.e., the control. Beside a rigorous proof of the slow/fast (adiabatic) reduction based on singular perturbation theory, we also provide a physical interpretation of the result in the context of coherence population trapping via dark states and decoherence-free subspaces. Numerical simulations illustrate the accuracy of the proposed approximation for a 5-level systems.

Download PDF

BibTeX:

@Article{,

author = {M. Mirrahimi, P. Rouchon},

title = {Singular perturbations and Lindblad-Kossakowski differential equations},

journal = {IEEE Trans. Automatic Control},

volume = {54},

number = {6},

pages = {1325 - 1329},

year = {2009},

abstract = {We consider an ensemble of quantum systems whose average evolution is described by a density matrix, solution of a Lindblad-Kossakowski differential equation. We focus on the special case where the decoherence is only due to a highly unstable excited state and where the spontaneously emitted photons are measured by a photo-detector. We propose a systematic method to eliminate the fast and asymptotically stable dynamics associated to the excited state in order to obtain another differential equation for the slow part. We show that this slow differential equation is still of Lindblad-Kossakowski type, that the decoherence terms and the measured output depend explicitly on the amplitudes of quasi-resonant applied field, i.e., the control. Beside a rigorous proof of the slow/fast (adiabatic) reduction based on singular perturbation theory, we also provide a physical interpretation of the result in the context of coherence population trapping via dark states and decoherence-free subspaces. Numerical simulations illustrate the accuracy of the proposed approximation for a 5-level systems.},

location = {},

keywords = {Adiabatic approximation, coherent population trapping, Lindblad–Kossakowski master equation, model reduction, open quantum systems, optical pumping, singular perturbations}}

IEEE Trans. Automatic Control. Vol 54 (6), pp:1325 - 1329, 2009 DOI: 10.1109/TAC.2009.2015542

We consider an ensemble of quantum systems whose average evolution is described by a density matrix, solution of a Lindblad-Kossakowski differential equation. We focus on the special case where the decoherence is only due to a highly unstable excited state and where the spontaneously emitted photons are measured by a photo-detector. We propose a systematic method to eliminate the fast and asymptotically stable dynamics associated to the excited state in order to obtain another differential equation for the slow part. We show that this slow differential equation is still of Lindblad-Kossakowski type, that the decoherence terms and the measured output depend explicitly on the amplitudes of quasi-resonant applied field, i.e., the control. Beside a rigorous proof of the slow/fast (adiabatic) reduction based on singular perturbation theory, we also provide a physical interpretation of the result in the context of coherence population trapping via dark states and decoherence-free subspaces. Numerical simulations illustrate the accuracy of the proposed approximation for a 5-level systems.

Download PDF

BibTeX:

@Article{,

author = {M. Mirrahimi, P. Rouchon},

title = {Singular perturbations and Lindblad-Kossakowski differential equations},

journal = {IEEE Trans. Automatic Control},

volume = {54},

number = {6},

pages = {1325 - 1329},

year = {2009},

abstract = {We consider an ensemble of quantum systems whose average evolution is described by a density matrix, solution of a Lindblad-Kossakowski differential equation. We focus on the special case where the decoherence is only due to a highly unstable excited state and where the spontaneously emitted photons are measured by a photo-detector. We propose a systematic method to eliminate the fast and asymptotically stable dynamics associated to the excited state in order to obtain another differential equation for the slow part. We show that this slow differential equation is still of Lindblad-Kossakowski type, that the decoherence terms and the measured output depend explicitly on the amplitudes of quasi-resonant applied field, i.e., the control. Beside a rigorous proof of the slow/fast (adiabatic) reduction based on singular perturbation theory, we also provide a physical interpretation of the result in the context of coherence population trapping via dark states and decoherence-free subspaces. Numerical simulations illustrate the accuracy of the proposed approximation for a 5-level systems.},

location = {},

keywords = {Adiabatic approximation, coherent population trapping, Lindblad–Kossakowski master equation, model reduction, open quantum systems, optical pumping, singular perturbations}}