Robust quantum repeater with atomic ensembles against phase and polarization instability

TL;DR

This paper presents a quantum repeater scheme that uses time-bin photonic states and a novel interference method to maintain entanglement over long distances without the need for phase stabilization or polarization calibration, making it feasible with current technology.

Contribution

It introduces a robust quantum repeater protocol utilizing atomic ensembles and time-bin encoding, eliminating the need for phase and polarization stabilization in long-distance quantum communication.

Findings

Enables entanglement distribution without phase stabilization.

Compatible with existing experimental setups with minor adjustments.

Improves robustness of quantum repeaters against channel instabilities.

Abstract

We propose an alternative scheme for quantum repeater without phase stabilization and polarization calibration of photons transmitted over long-distance channel. We introduce time-bin photonic states and use a new two-photon interference configuration to robustly generate entanglement between distant atomic-ensemble-based memory qubits. Our scheme can be performed with current experimental setups through making some simple adjustments.