Centre for Quantum Technologies, National University of Singapore, Singapore.
Phys Rev Lett. 2011 Jul 29;107(5):050502. doi: 10.1103/PhysRevLett.107.050502. Epub 2011 Jul 25.
We present a device-independent protocol to test if a given black-box measurement device is entangled, that is, has entangled eigenstates. Our scheme involves three parties and is inspired by entanglement swapping; the test uses the Clauser-Horne-Shimony-Holt Bell inequality, checked between each pair of parties. In the case where all particles are qubits, we characterize quantitatively the deviation of the measurement device from a perfect Bell-state measurement.
我们提出了一种设备无关的协议来测试给定的黑盒测量设备是否处于纠缠态，也就是说，它具有纠缠本征态。我们的方案涉及三方，灵感来自纠缠交换；该测试使用 Clauser-Horne-Shimony-Holt 贝尔不等式，在每对双方之间进行检查。在所有粒子都是量子位的情况下，我们定量地表征了测量设备与完美贝尔态测量的偏差。
