Preservation of quantum non-bilocal correlations in noisy entanglement-swapping experiments using weak measurements

TL;DR

This paper demonstrates that weak measurements and their reversals can effectively preserve quantum non-bilocal correlations in noisy entanglement-swapping experiments, counteracting decoherence effects like amplitude damping.

Contribution

It introduces a method to maintain quantum non-bilocal correlations in noisy environments using weak measurement techniques, enhancing robustness of quantum networks.

Findings

Weak measurements slow down the decay of non-bilocal correlations.

Preservation of correlations depends on the success rate of post-selection.

Method effective over a large parameter range.

Abstract

A tripartite quantum network is said to be bilocal if two independent sources produce a pair of bipartite entangled states. Quantum non-bilocal correlation emerges when the central party which possesses two particles from two different sources performs Bell-state measurement on them and nonlocality is generated between the other two uncorrelated systems in this entanglement-swapping protocol. The interaction of such systems with the environment reduces quantum non-bilocal correlations. Here we show that the diminishing effect modelled by the amplitude damping channel can be slowed down by employing the technique of weak measurements and reversals. It is demonstrated that for a large range of parameters the quantum non-bilocal correlations are preserved against decoherence by taking into account the average success rate of the post-selection governing weak measurements.