光学微腔中利用量子点自旋实现抗损耗态隐形传态和纠缠交换
Loss-resistant state teleportation and entanglement swapping using a quantum-dot spin in an optical microcavity
摘要：
提出了一种在巨圆双折射光学微腔中利用单个量子点自旋实现有效态隐形传态和纠缠交换的方案。态隐形传态或纠缠交换是通过对两个光子的连续探测来实现的，并在自旋测量之后完成。自旋腔单元作为一个完整的贝尔状态分析仪工作，内置自旋存储器，允许抗丢失中继器操作。该器件可以工作在弱耦合和强耦合两种情况下，但只有当侧漏和腔损耗较低时才能实现高效率和高精度。我们评估该设备的可行性，并表明它可以实现与当前的技术。我们还提出了一种利用单光子的自旋操纵方法，通过自旋回波技术可以保持自旋相干性。
英文摘要：
We present a scheme for efficient state teleportation and entanglement swapping using a single quantum-dot spin in an optical microcavity based on giant circular birefringence. State teleportation or entanglement swapping is heralded by the sequential detection of two photons, and is finished after the spin measurement. The spin-cavity unit works as a complete Bell-state analyzer with a built-in spin memory allowing loss-resistant repeater operation. This device can work in both the weak coupling and the strong coupling regime, but high efficiencies and high fidelities are only achievable when the side leakage and cavity loss is low. We assess the feasibility of this device, and show it can be implemented with current technology. We also propose a spin manipulation method using single photons, which could be used to preserve the spin coherence via spin echo techniques.
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