arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.5185quant-ph
收藏

基于量子比特放大器的量子中继器

Quantum repeaters based on heralded qubit amplifiers

Jiří Minář, Hugues de Riedmatten, Nicolas Sangouard

摘要:

基于最近提出的量子比特放大器[N. Gisin,S. Pironio和N. Sangouard,Phys. Rev. Lett. 105,070501(2010)]。它依赖于按需纠缠光子对源,该源使用按需单光子源、线性光学元件和原子系综。有趣的是,影响从该源产生的状态的缺陷,例如由具有非单位效率的检测器引起的,从基于双光子检测的纠缠交换操作中系统地纯化。这允许在非常长的距离上以高保真度分配纠缠,即没有真空组件和多光子错误。因此,所得到的量子中继器架构不需要最终的后选择,从而实现高纠缠分发速率。这也提供了独特的机会,设备无关的量子密钥分发在长距离与线性光学和原子合奏。

英文摘要:

We present a quantum repeater scheme based on the recently proposed qubit amplifier [N. Gisin, S. Pironio and N. Sangouard, Phys. Rev. Lett. 105, 070501 (2010)]. It relies on a on-demand entangled-photon pair source which uses on-demand single-photon sources, linear optical elements and atomic ensembles. Interestingly, the imperfections affecting the states created from this source, caused e.g. by detectors with non-unit efficiencies, are systematically purified from an entanglement swapping operation based on a two-photon detection. This allows the distribution of entanglement over very long distances with a high fidelity, i.e. without vacuum components and multiphoton errors. Therefore, the resulting quantum repeater architecture does not necessitate final postselections and thus achieves high entanglement distribution rates. This also provides unique opportunities for device-independent quantum key distribution over long distances with linear optics and atomic ensembles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑