Bayrakci Veysel, Ozaydin Fatih
Faculty of Engineering and Natural Sciences, Isik University, 34980, Sile, Istanbul, Türkiye.
Institute for International Strategy, Tokyo International University, 1-13-1 Matoba-kita, Kawagoe, Saitama, 350-1197, Japan.
Sci Rep. 2022 Sep 12;12(1):15302. doi: 10.1038/s41598-022-19170-z.
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.
量子中继器为长距离量子通信和量子互联网铺平了道路，量子中继器的概念基于纠缠交换，这需要实现受控量子门。频繁测量量子系统会影响其动力学，这就是所谓的量子芝诺效应（QZE）。除了减缓其演化之外，量子芝诺效应还可以通过在测量之间引入一组精心设计的操作来控制量子系统的动力学。在此，我们提出了一种基于量子芝诺效应的纠缠交换协议，该协议实现了几乎单位保真度。我们协议的实现仅需要简单的频繁阈值测量和单粒子旋转。我们将所提出的纠缠交换协议扩展到一系列中继站，以构建量子芝诺中继器，无论中继器的数量多少，该中继器也能实现几乎单位保真度。由于不需要受控门，我们的提议降低了量子中继器的量子电路复杂度。我们的工作有潜力通过量子芝诺效应为长距离量子通信和量子计算做出贡献。
