Alice and Bob through a quantum mirror

TL;DR

This paper introduces quantum mirrors as controllable nodes in quantum networks, enabling high-fidelity quantum teleportation and entanglement swapping with robustness against common errors, advancing long-distance quantum communication.

Contribution

It proposes using quantum mirrors with propagating coherent states for quantum network operations, achieving near-perfect fidelity and robustness, which is a novel approach in quantum communication.

Findings

Quantum teleportation fidelity approaches unity with increasing photon number.

Quantum mirrors demonstrate robustness against phase difference, photon loss, and reflectivity reduction.

The method enables efficient long-distance quantum communication.

Abstract

A quantum mirror is a device whose optical response, that is, transmission and reflection, can be controlled by a single qubit. Here, we propose the use of quantum mirrors as nodes in quantum networks. Propagating coherent states mediate the interaction between the control qubits of each quantum mirror. This allows implementing quantum teleportation, quantum state transfer, and entanglement swapping with success probability and average fidelity exponentially approaching unity as the average photon number increases. Furthermore, we show that quantum teleportation exhibits robustness against known sources of error, such as optical path phase difference, photon loss, and reduced quantum mirror reflectivity, presenting a promising alternative towards long-distance quantum communication.