论文标题
量子Zeno中继器
Quantum Zeno Repeaters
论文作者
论文摘要
量子中继器为长距离量子通信和量子互联网铺平了道路，量子中继器的想法基于纠缠交换，这需要实施受控的量子门。经常测量量子系统会影响其动力学，即被称为量子Zeno效应（QZE）。除了减慢其演变的速度外，QZE还可以通过在测量之间引入一套经过精心设计的操作来控制量子系统的动力学。在这里，我们提出了基于QZE的纠缠交换协议，该协议几乎实现了单位保真度。我们的协议的实施只需要简单的频繁阈值测量和单个粒子旋转。我们将拟议的纠缠交换方案扩展到一系列中继器站，用于构建量子Zeno中继器，这些杂货转折也几乎达到了单位保真度，而不管中继器的数量多少。我们的建议不需要控制门，降低了量子中继器的量子电路复杂性。我们的工作有可能通过量子ZENO效应为长距离量子通信和量子计算做出贡献。
Quantum repeaters pave the way for long-distance quantum communications and quantum Internet, and the idea of quantum repeaters is based on entanglement swapping which requires the implementation of controlled quantum gates. Frequently measuring a quantum system affects its dynamics which is known as the quantum Zeno effect (QZE). Beyond slowing down its evolution, QZE can be used to control the dynamics of a quantum system by introducing a carefully designed set of operations between measurements. Here, we propose an entanglement swapping protocol based on QZE, which achieves almost unit fidelity. Implementation of our protocol requires only simple frequent threshold measurements and single particle rotations. We extend the proposed entanglement swapping protocol to a series of repeater stations for constructing quantum Zeno repeaters which also achieve almost unit fidelity regardless of the number of repeaters. Requiring no controlled gates, our proposal reduces the quantum circuit complexity of quantum repeaters. Our work has potential to contribute to long distance quantum communications and quantum computing via quantum Zeno effect.
