Proposed method for direct measurement of non-Markovian character of the qubits coupled to bosonic reservoirs

TL;DR

This paper introduces a practical method for directly measuring the non-Markovian behavior of qubits coupled to bosonic reservoirs, avoiding complex procedures and aiding experimental applications.

Contribution

It presents a novel, optimization-free approach for directly quantifying non-Markovianity in single and two-qubit systems coupled to reservoirs.

Findings

Method enables direct measurement without quantum state tomography.

Applicable to single and two-qubit systems with reservoirs.

Facilitates experimental implementation of non-Markovianity detection.

Abstract

The non-Markovianity is a recently proposed characterization of the non-Markovian behavior in an open quantum system, based on which we first present a practical idea for directly measuring the non-Markovian character of a single qubit coupled to a zero-temperature bosonic reservoir, and then extend to investigate the dynamics of two noninteracting qubits subject to two reservoirs respectively with a lower bound of non-Markovianity. Our scheme, with no need of optimization procedures and quantum state tomography, is helpful for experimental implementation.