Hastening, delaying, or averting sudden death of quantum entanglement

TL;DR

This paper explores how local unitary actions can control the finite-time death of quantum entanglement, enabling it to be hastened, delayed, or prevented, which has practical implications for quantum state stabilization.

Contribution

It introduces a method to manipulate the timing of entanglement death using local actions during decoherence, a novel approach for quantum state control.

Findings

Entanglement death can be sped up or slowed down by local unitary operations.

It is possible to completely prevent entanglement sudden death with appropriate interventions.

The method applies to two qubits decaying into independent reservoirs.

Abstract

The finite time end of entanglement between two decohering qubits can be modified by local, unitary actions performed during the decohering process. Depending on the time when such action is taken, the end can be speeded up or slowed down, or even averted all together. This phenomenon offers practical applications for the stabilization of entangled quantum states. Details concerning hastening or delaying the finite time end of entanglement are presented for two qubits which decay spontaneously into statistically independent reservoirs.