Experimental realization of a photonic Bell-state analyzer

被引：26

作者：

Walther, P

Zeilinger, A

机构：

[1] Univ Vienna, Inst Expt Phys, A-1090 Vienna, Austria

[2] Austrian Acad Sci, Inst Quantenopt & Quanteninformat, Vienna, Austria

来源：

PHYSICAL REVIEW A | 2005年 / 72卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.72.010302

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Efficient teleportation is a crucial step for quantum computation and quantum networking. In the case of qubits, four different entangled Bell states have to be distinguished. We have realized a probabilistic, but in principle deterministic, Bell-state analyzer for two photonic quantum bits by the use of a nondestructive controlled-NOT gate based on entirely linear optical elements. This gate was capable of distinguishing between all of the Bell states with higher than 75% fidelity without any noise substraction due to utilizing quantum interference effects.

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