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Physics Letters A

Linear optical implementation of a quantum network for quantum estimation

Zhiwei Wang, Jian Li, Yun‐Feng Huang, Yong-Sheng Zhang, Xi‐Feng Ren, Pei Zhang, Guang‐Can Guo

Published Jul 21, 2007• 3 citations
Publisher
DOI
10.1016/j.physleta.2007.07.026

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We investigate the effect of variations in beam-splitter transmissions and path-length differences in the nonlinear sign gate that is used for linear optical quantum computing. We identify two implementations of the gate and show that the sensitivity to variations in their components differs significantly between them. Therefore, circuits that require a precision implementation will generally benefit from additional circuit analysis of component variations to identify the most practical implementation. We suggest possible routes to efficient circuit analysis in terms of quantum parameter estimation.