A tripartite quantum network is said to be bilocal if two independent sources produce a pair of bipartite entangled states. Quantum nonbilocal 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 nonbilocal correlations. Here we show that the diminishing effect modeled 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 nonbilocal correlations are preserved against decoherence by taking into account the average success rate of the postselection governing weak measurements.

• Received 6 August 2018

DOI:https://doi.org/10.1103/PhysRevA.98.042322