Enhancement of coherence in qubits due to interaction with the environment

V. V. Ignatyuk and V. G. Morozov

Phys. Rev. A 91, 052102 – Published 6 May 2015

Abstract

The influence of the initial preparation on dephasing in open quantum dynamics is studied using an exactly solvable model of a two-level system (qubit) interacting with a bosonic bath. It is found that, for some classes of nonselective preparation measurements, qubit-bath correlations lead to a significant enhancement of coherence in the qubit at the initial stage of evolution. The time behavior of the qubit purity and entropy in the regime of enhancement of coherence is considered for different temperatures and coupling strengths.

Received 15 February 2015

DOI:https://doi.org/10.1103/PhysRevA.91.052102

Authors & Affiliations

V. V. Ignatyuk^1,* and V. G. Morozov^2,†

¹Institute for Condensed Matter Physics, 1 Svientsitskii Street, 79011 Lviv, Ukraine
²Moscow State Technical University of Radioengineering, Electronics, and Automation, Vernadsky Prospect 78, 119454 Moscow, Russia

^*ignat@icmp.lviv.ua
^†vladmorozov45@gmail.com

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Issue

Vol. 91, Iss. 5 — May 2015

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