Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian Nation University, Canberra, Australian Capital Territory 2601, Australia.
Centre for Quantum Computation and Communication Technology, Research School of Engineering, The Australian Nation University, Canberra, Australian Capital Territory 2601, Australia.
Phys Rev Lett. 2018 Jan 26;120(4):040406. doi: 10.1103/PhysRevLett.120.040406.
A Bell inequality is a fundamental test to rule out local hidden variable model descriptions of correlations between two physically separated systems. There have been a number of experiments in which a Bell inequality has been violated using discrete-variable systems. We demonstrate a violation of Bell's inequality using continuous variable quadrature measurements. By creating a four-mode entangled state with homodyne detection, we recorded a clear violation with a Bell value of B=2.31±0.02. This opens new possibilities for using continuous variable states for device independent quantum protocols.
贝尔不等式是一种基本的测试方法，用于排除两个物理上分离的系统之间相关性的局部隐变量模型描述。已经有许多实验使用离散变量系统违反了贝尔不等式。我们使用连续变量正交测量演示了贝尔不等式的违反。通过使用同相检测创建四模纠缠态，我们记录了一个明显的违反，贝尔值为 B=2.31±0.02。这为使用连续变量态进行设备无关量子协议开辟了新的可能性。
