论文标题
操纵复杂的混合纠缠和测试超导电路中的多方钟不等式
Manipulating complex hybrid entanglement and testing multipartite Bell inequalities in a superconducting circuit
论文作者
论文摘要
多个系统的可观察物中的量子相关性不仅具有基本兴趣，而且在量子信息处理中起关键作用。作为这些相关性的签名，涉及连续变量和离散变量的多部分混合纠缠尚未证明对贝尔的不平等的侵犯。在这里，我们创建了一个五边形纠缠状态，具有三个超导式转移量子和两个光子量子量，每个量子都在微波腔的介质场中编码。我们通过在检测量子位的两个腔场和五边形的钟形不平等的测试中，通过两个空腔场的关节wigner断层扫描揭示了这些不同元素之间的量子相关性。测得的贝尔信号为$ 8.381 \ pm0.038 $，超过了由量子相关性施加的四方纠缠的8个界限，这是通过10个标准偏差强加的，这表明了混合量子系统中真正的五边形纠缠。
Quantum correlations in observables of multiple systems not only are of fundamental interest, but also play a key role in quantum information processing. As a signature of these correlations, the violation of Bell inequalities has not been demonstrated with multipartite hybrid entanglement involving both continuous and discrete variables. Here we create a five-partite entangled state with three superconducting transmon qubits and two photonic qubits, each encoded in the mesoscopic field of a microwave cavity. We reveal the quantum correlations among these distinct elements by joint Wigner tomography of the two cavity fields conditional on the detection of the qubits and by test of a five-partite Bell inequality. The measured Bell signal is $8.381\pm0.038$, surpassing the bound of 8 for a four-partite entanglement imposed by quantum correlations by 10 standard deviations, demonstrating the genuine five-partite entanglement in a hybrid quantum system.
