Proposed entanglement beam splitter using a quantum-dot spin in a double-sided optical microcavity
Proposed entanglement beam splitter using a quantum-dot spin in a double-sided optical microcavity
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DOI：
10.1103/physrevb.80.205326
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发表时间：
2009-11-01
影响因子：
3.7
通讯作者：
Rarity, J. G.
中科院分区：
文献类型：
--
作者：
Hu, C. Y.;Munro, W. J.;Rarity, J. G.
提出了一种在双面光学微腔中利用量子点自旋的纠缠分束器。与传统的分束器相比，EBS可以通过传输和反射将一个光子-自旋产物态直接分裂为两个成分纠缠态，具有高保真和高效率(高达100%)的特点。这种器件是基于腔量子电动力学和三子跃迁的自旋选择规则(泡利阻塞)引起的单个自旋引起的巨型光学圆双折射。EBS是健壮的，它不受现实量子点中精细结构分裂的影响。这种量子装置可以用来确定地产生光子-自旋、光子-光子和自旋-自旋纠缠，以及对单个自旋的单次量子不破坏测量。因此，EBS可以在量子信息科学和技术中得到广泛的应用。
We propose an entanglement beam splitter (EBS) using a quantum-dot spin in a double-sided optical microcavity. In contrast to the conventional optical beam splitter, the EBS can directly split a photon-spin product state into two constituent entangled states via transmission and reflection with high fidelity and high efficiency (up to 100 percent). This device is based on giant optical circular birefringence induced by a single spin as a result of cavity quantum electrodynamics and the spin-selection rule of trion transition (Pauli blocking). The EBS is robust and it is immune to the fine-structure splitting in a realistic quantum dot. This quantum device can be used for deterministically creating photon-spin, photon-photon, and spin-spin entanglements as well as a single-shot quantum nondemolition measurement of a single spin. Therefore, the EBS can find wide applications in quantum information science and technology.