Work

Task-optimized control of open quantum systems

Year: 2012

Type: article

Abstract: We develop a general optimization strategy for performing a chosen unitary or nonunitary task on an open quantum system. The goal is to design a controlled time-dependent system Hamiltonian by variationally minimizing or maximizing a chosen function of the system state, which quantifies the task success (score), such as fidelity, purity, or entanglement. If the time dependence of the system Hamiltonian is fast enough to be comparable to or shorter than the response time of the bath, then the resulting non-Markovian dynamics is shown to optimize the chosen task score to second order in the coupling to the bath. This strategy can protect a desired unitary system evolution from bath-induced decoherence, but can also take advantage of the system-bath coupling so as to realize a desired nonunitary effect on the system.

Source: Physical Review A

DOI: 10.1103/physreva.85.052105

Authors: Jens Clausen, Guy Bensky, Gershon Kurizki

Institutions: Austrian Academy of Sciences, Universität Innsbruck, Institute for Quantum Optics and Quantum Information Innsbruck, Weizmann Institute of Science

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Israel Science Foundation

OpenAlex ID: W2320340466

FWCI: 2.207

Cites: 108

Cited by: 25

Related to: 10