Comparison of LOQC C-sign gates with ancilla inefficiency and an improvement to functionality under these conditions

Details Comparison of LOQC C-sign gates with ancilla inefficiency and an improvement to functionality under these conditions Comparison of LOQC C-sign gates with ancilla inefficiency and an improvement to functionality under these conditions

2003-08-12

arxiv.org/abs/quant-ph/0308071v1

Phys.Rev.A 68, 022313 (2003).

Physics

Quantum Physics

to appear in PRA

Scientific paper

10.1103/PhysRevA.68.022313

We compare three proposals for non-deterministic C-sign gates implemented using linear optics and conditional measurements with non-ideal ancilla mode production and detection. The simplified KLM gate [Ralph et al, Phys.Rev.A {\bf 65}, 012314 (2001)] appears to be the most resilient under these conditions. We also find that the operation of this gate can be improved by adjusting the beamsplitter ratios to compensate to some extent for the effects of the imperfect ancilla.

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