Physically Realizable Entanglement by Local Continuous Measurements

TL;DR

This paper investigates how continuous local measurements on environments can generate or preserve entanglement in quantum systems, providing strategies to optimize entanglement under environmental noise.

Contribution

It introduces the concept of physically realizable entanglement and optimizes measurement strategies to control entanglement in open quantum systems.

Findings

Maximum realizable entanglement matches upper bounds for some noise sources.

Local measurement strategies cannot reach the lower bound of unmonitored entanglement.

The scheme offers an alternative to protect entanglement locally.

Abstract

Quantum systems prepared in pure states evolve into mixtures under environmental action. Physically realizable ensembles are the pure state decompositions of those mixtures that can be generated in time through continuous measurements of the environment. Here, we define physically realizable entanglement as the average entanglement over realizable ensembles. We optimize the measurement strategy to maximize and minimize this quantity through local observations on the independent environments that cause two qubits to disentangle in time. We then compare it with the entanglement bounds for the unmonitored system. For some relevant noise sources the maximum realizable entanglement coincides with the upper bound, establishing the scheme as an alternative to locally protect entanglement. However, for local strategies, the lower bound of the unmonitored system is not reached.