Entangling and decohering influence of noisy perturbations. Stochastic anti-resonance in the time evolution of interacting qubits

TL;DR

This paper investigates how noisy perturbations influence entanglement in two coupled qubits, revealing a non-monotonous relationship called stochastic anti-resonance, which impacts quantum device design.

Contribution

It introduces the concept of stochastic anti-resonance, showing that entanglement disentanglement time varies non-monotonously with noise strength in qubits.

Findings

Disentanglement time is shortest at intermediate noise levels.

Entanglement degrades due to noise but exhibits non-monotonous behavior.

Results inform better design of quantum devices under noisy conditions.

Abstract

We study the entanglement evolution of two coupled qubits in interaction with an external environment and in the presence of an external magnetic field with a stochastic component. The results show the expected degradation of entanglement due to the noise. The new effect is that the time of disentanglement depends in a non-monotonous way on the strength of the noise. We find that it is shortest for an intermediate strength value of the latter. This we call "stochastic anti-resonance". Our results could lead to a better undestanding of noisy perturbations and their role for optimal designing of quantum devices.