Nonlocal memory effects allow perfect teleportation with mixed states

TL;DR

This paper demonstrates that nonlocal memory effects enable perfect quantum teleportation with mixed states, even after initial decoherence, by leveraging environmental correlations as a resource.

Contribution

It introduces a protocol utilizing nonlocal memory effects from environmental correlations to restore perfect teleportation with mixed photon states.

Findings

Nonlocal memory effects can restore perfect teleportation despite initial decoherence.

Fidelity exceeds previous protocols when environmental correlations are moderate.

Memory effects serve as a resource in noisy quantum communication systems.

Abstract

We show that perfect quantum teleportation can be achieved with mixed photon polarization states when nonlocal memory effects influence the dynamics of the quantum system. The protocol is carried out with a pair of photons, whose initial maximally entangled state is destroyed by local decoherence prior to teleportation. It is demonstrated that the presence of strong nonlocal memory effects, which arise from initial correlations between the environments of the photons, allow to restore perfect teleportation. We further analyze how the amount of initial correlations within the environment affects the fidelity of the protocol, and find that for a moderate amount of correlations the fidelity exceeds the one of the previously known optimal teleportation protocol without memory effects. Our results show that memory effects can be exploited in harnessing noisy quantum systems for quantum communication and that non-Markovianity is a resource for quantum information tasks.