Deterministic Entanglement Swapping in a Superconducting Circuit.
Deterministic Entanglement Swapping in a Superconducting Circuit.
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DOI：
10.1103/physrevlett.123.060502
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发表时间：
2019-02
影响因子：
8.6
通讯作者：
W. Ning;Xinjie Huang;Pei-Rong Han;Hekang Li;H. Deng;Zhen‐Biao Yang;Zhi-Rong Zhong;Yan Xia;Kai Xu;D. Zheng;Shi-Biao Zheng
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文献类型：
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作者：
W. Ning;Xinjie Huang;Pei-Rong Han;Hekang Li;H. Deng;Zhen‐Biao Yang;Zhi-Rong Zhong;Yan Xia;Kai Xu;D. Zheng;Shi-Biao Zheng
纠缠交换，即使两个粒子纠缠而不以任何方式耦合的过程，是量子力学非局域特性最显着的表现之一。除了基本兴趣之外，该过程在复杂的纠缠操纵和量子通信中也有应用。在这里，我们报告了超导电路中的高保真、无条件纠缠交换实验。测量的表征交换产生的量子位-量子位纠缠的并发性高于 0.75，证实一个量子位与其伙伴的大部分纠缠被确定性地转移到另一个从未与其交互的量子位。我们进一步实现了延迟选择纠缠交换，显示两个量子位之前的行为是处于纠缠状态还是处于可分离状态，是由稍后选择其伙伴的测量类型决定的。这是首次以确定性方式证明纠缠-可分离二元性。
Entanglement swapping, the process to entangle two particles without coupling them in any way, is one of the most striking manifestations of the quantum-mechanical nonlocal characteristic. Besides fundamental interest, this process has applications in complex entanglement manipulation and quantum communication. Here we report a high-fidelity, unconditional entanglement swapping experiment in a superconducting circuit. The measured concurrence characterizing the qubit-qubit entanglement produced by swapping is above 0.75, confirming most of the entanglement of one qubit with its partner is deterministically transferred to another qubit that has never interacted with it. We further realize delayed-choice entanglement swapping, showing whether two qubits previously behaved as in an entangled state or as in a separable state is determined by a later choice of the type of measurement on their partners. This is the first demonstration of entanglement-separability duality in a deterministic way.