用通用时间仓量子比特分析器测试12.4km以上地下光纤的非定域性
Testing nonlocality over 12.4 km of underground fiber with universal time-bin qubit analyzers
摘要：
我们通过实验证明，当时间仓纠缠光子量子比特对中的一个或两个量子比特被转换为偏振量子比特时，纠缠光子量子比特的非定域性质仍然存在。这是可能的，通过实现一种新的通用时间仓量子位分析器（UTBA），它第一次允许在任何基础上分析时间仓量子位。我们揭示了发射光的非局域性违反Clauser-Horne-Shimony-Holt不等式与测量基地探索所有的尺寸的布洛赫球。此外，我们进行了实验，其中一个量子比特通过12.4公里的地下光纤链路传输，并证明了我们的方案在现实世界中使用的适用性。由此产生的纠缠也可以解释为两个物理系统的不同类型的自由度之间的混合纠缠，这可能在大规模异构量子网络中证明是有用的。这项工作为测试非定域性和实现具有时间仓纠缠的新量子通信协议开辟了新的可能性。
英文摘要：
We experimentally demonstrate that the nonlocal nature of time-bin entangled photonic qubits persists when one or two qubits of the pair are converted to polarization qubits. This is possible by implementing a novel Universal Time-Bin Qubit Analyzer (UTBA), which, for the first time, allows analyzing time-bin qubits in any basis. We reveal the nonlocal nature of the emitted light by violating the Clauser-Horne-Shimony-Holt inequality with measurement bases exploring all the dimensions of the Bloch sphere. Moreover, we conducted experiments where one qubit is transmitted over a 12.4 km underground fiber link and demonstrate the suitability of our scheme for use in a real-world setting. The resulting entanglement can also be interpreted as hybrid entanglement between different types of degrees of freedom of two physical systems, which could prove useful in large scale, heterogeneous quantum networks. This work opens new possibilities for testing nonlocality and for implementing new quantum communication protocols with time-bin entanglement.
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