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

Abstract

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.

arXiv commentto appear in PRA

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Cited by in corpus (11)

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• Coherent state LOQC gates using simplified diagonal superposition resource states
• Practical limitations in optical entanglement purification
• Retrodictive fidelities for pure state postselectors
• Conditional sign flip via teleportation
• The effect of component variations on the gate fidelity in linear optical networks
• Analysis of quantum information processors using quantum metrology