Heralded entanglement purification protocol using high-fidelityparity-check gate based on nitrogen-vacancy center in optical cavity

• 来源期刊: 中国物理B（英文版）
• 关键词: quantum communication heralded entanglement purification heralded parity-check gate
• 年，卷（期）: 2020,（1）
• 页码范围: 157-165
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab5939

摘要

The decoherence of entangled states caused by the noisy channel is a salient problem for reducing the fidelity of quantum communication. Here we present a heralded two-photon entanglement purification protocol (EPP) using heralded high-fidelity parity-check gate (HH-PCG), which can increase the entanglement of nonlocal two-photon polarization mixed state. The HH-PCG is constructed by the input-output process of nitrogen-vacancy (NV) center in diamond embedded in a single-sided optical cavity, where the errors caused by the imperfect interaction between the NV center-cavity system and the photon can be heralded by the photon detector. As the unwanted components can be filtrated due to the her-alded function, the fidelity of the EPP scheme can be enhanced considerably, which will increase the fidelity of quantum communication processing.