Symmetry in the open-system dynamics of quantum correlations

TL;DR

This paper investigates how quantum correlations in two-qubit systems decay symmetrically or asymmetrically under different noisy channels, revealing that decay symmetry depends on noise type and correlation type, not initial state symmetry.

Contribution

It systematically analyzes symmetry properties in the dynamics of quantum correlations under various noise channels, highlighting the influence of noise location and type on correlation decay.

Findings

Symmetric decay is not solely determined by initial state symmetry.

Asymmetric decay can reveal properties of the noise channel.

Noise location significantly affects entanglement sudden death and discord persistence.

Abstract

We study the symmetry properties in the dynamics of quantum correlations for two-qubit systems in one-sided noisy channels, with respect to a switch in the location of noise from one qubit to the other. We consider four different channel types, namely depolarizing, amplitude damping, bit-flip, and bit-phase-flip channel, and identify the classes of initial states leading to symmetric decay of entanglement, non-locality and discord. Our results show that the symmetric decay of quantum correlations is not directly linked to the presence or absence of symmetry in the initial state, while it does depend on the type of correlation considered as well as on the type noise. We prove that asymmetric decay can be used to infer, in certain cases, characteristic properties of the channel. We also show that the location of noise may lead to dramatic changes in the persistence of phenomena such as entanglement sudden death and time-invariant discord.