Two-step measurement of the concurrence for hyperentangled state

Two-step measurement of the concurrence for hyperentangled state
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超纠缠态并发的两步测量

DOI:
10.1007/s11128-015-0916-1
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发表时间:
2015-01
影响因子:
2.5
通讯作者:
Wang Xing-Fu
Wang Xing-Fu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Sheng Yu-Bo;Guo Rui;Pan Jun;Zhou Lan;Wang Xing-Fu

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我们描述了一种测量超纠缠并发度的有效方法。在该协议中,超纠缠态被编码为极化自由度和动量自由度。我们证明了极化和动量纠缠并发度的测量可以转换为奇宇称态总概率的测量,并且可以直接测量。该协议需要弱交叉克尔非线性来构建量子非拆除测量,并且不需要复杂的控非门操作。在未来的实验技术中是可行的。
We describe an efficient way of measuring the concurrence for the hyperentanglement. In this protocol, the hyperentangled state is encoded in both the polarization and the momentum degrees of freedom. We show that measurement of the concurrences of both polarization and momentum entanglements can be conversed into the measurement of the total probability of picking up the odd-parity state and can be measured directly. This protocol requires the weak cross-Kerr nonlinearity to construct the quantum nondemolition measurement and does not require the sophisticated controlled-not gate operation. It is feasible in future experimental technology.
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