Universal unitary gate for single-photon two-qubit states
Universal unitary gate for single-photon two-qubit states
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DOI：
10.1103/physreva.63.032303
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发表时间：
2001-03-01
影响因子：
2.9
通讯作者：
Weinfurter, H
中科院分区：
文献类型：
--
作者：
Englert, BG;Kurtsiefer, C;Weinfurter, H
在纠缠光子的空间二进制替代与其偏振，可以使用单光子来研究任意的2量子比特状态。通过马赫-曾德尔干涉仪发送光子，配备了一组改变偏振的波片，相当于对2量子比特状态进行幺正变换。我们表明，任何所需的酉门可以实现一个明智的选择的参数的设置和讨论的一些应用。它们包括对未知的2量子比特状态的诊断，光学Grover搜索以及Vaidman发明的思想实验的实现。阿哈罗诺夫还有阿尔伯特
Upon entangling a spatial binary alternative of a photon with its polarization, one can use single photons to study arbitrary 2-qubit states. Sending the photon through a Mach-Zehnder interferometer, equipped with sets of wave plates that change the polarization, amounts to performing a unitary transformation on the 2-qubit state. We show that any desired unitary gate can be realized by a judicious choice of the parameters of the setup and discuss a number of applications. They include the diagnosis of an unknown 2-qubit state, an optical Grover search, and the realization of a thought experiment invented by Vaidman. Aharonov. and Albert.