Entanglement purification of nonlocal quantum-dot-confined electrons assisted by double-sided optical microcavities

TL;DR

This paper introduces a nondestructive parity-check detector using entangled photons and microcavities to improve entanglement purification of electron pairs in quantum communication.

Contribution

It proposes a novel nondestructive PCD scheme and an efficient entanglement purification protocol for quantum dots in microcavities, enhancing quantum communication.

Findings

The PCD is robust to phase fluctuations.

The purification protocol increases efficiency and reduces source consumption.

Applicable to quantum networks and communication.

Abstract

We present a nondestructive parity-check detector (PCD) scheme for two single-electron quantum dots embedded in double-sided optical microcavities. Using a polarization-entangled photon pair, the PCD works in a parallel style and is robust to the phase fluctuation of the optical path length. In addition, we present an economic entanglement purification protocol for electron pairs with our nondestructive PCD. The parties in quantum communication can increase the purification efficiency and simultaneously decrease the quantum source consumed for some particular fidelity thresholds. Therefore, our protocol has good applications in the future quantum communication and distributed quantum networks.