Quantum Correlation Dynamics Subjected to Quantum Reset-Driven Environment

TL;DR

This paper explores how quantum reset operations on a driven environment influence entanglement and discord between two qubits, revealing regimes of revival, decay, and oscillatory behavior depending on coupling strength and reset rate.

Contribution

It introduces the concept of quantum reset in a driven environment and analyzes its effects on quantum correlations between qubits, highlighting new dynamical phenomena.

Findings

Revival of entanglement and discord in strong coupling with QR

Exponential decay of revival peaks with increasing QR rate

Oscillatory suppression of correlations under quantum reset

Abstract

We study two central qubits interacting with a transverse-field Ising chain that serves as their environment. The environment is driven linearly in time across its quantum critical points (QCPs) and, during the evolution, is subjected to quantum reset (QR), where it is returned at random times to its initial state. We investigate how such QR of the environmental spin chain modifies the dynamics of entanglement and quantum discord between the qubits. Our results show that in the strong-coupling regime, entanglement and discord exhibit pronounced revivals within the interval bounded by the Ising QCPs, but these revivals diminish as the QR rate increases. In contrast, weak coupling leads to a monotonic reduction of quantum correlations. Numerically, we find that the revival peaks of concurrence decay and scale exponentially with the QR rate, while quantum discord shows no clear scaling behavior. In the weak-coupling regime without QR, the correlations decay monotonically as the driven field crosses the second QCP. When QR is applied, however, both entanglement and discord undergo oscillatory suppression, with the oscillation period increasing as either the QR rate or the ramp time scale is reduced.