Shortcut to Equilibration of an Open Quantum System

We present a procedure to accelerate the relaxation of an open quantum system towards its equilibrium state. The control protocol, termed the shortcut to equilibration, is obtained by reverse-engineering the nonadiabatic master equation. This is a nonunitary control task aimed at rapidly changing th...

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Bibliographic Details
Published in:Physical review letters 2019-06, Vol.122 (25), p.250402-250402, Article 250402
Main Authors: Dann, Roie, Tobalina, Ander, Kosloff, Ronnie
Format: Article
Language:English
Subjects:
Balancing
Control tasks
Quantum theory
Thermalization (energy absorption)
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Summary:We present a procedure to accelerate the relaxation of an open quantum system towards its equilibrium state. The control protocol, termed the shortcut to equilibration, is obtained by reverse-engineering the nonadiabatic master equation. This is a nonunitary control task aimed at rapidly changing the entropy of the system. Such a protocol serves as a shortcut to an abrupt change in the Hamiltonian, i.e., a quench. As an example, we study the thermalization of a particle in a harmonic well. We observe that for short protocols the accuracy improves by 3 orders of magnitude.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.250402