Interconvertibility of single-rail optical qubits

Details Interconvertibility of single-rail optical qubits Interconvertibility of single-rail optical qubits

2005-07-22

arxiv.org/abs/quant-ph/0507216v1

Optics Letters 31, 107 (2006)

Physics

Quantum Physics

3 pages, 2 figures

Scientific paper

10.1364/OL.31.000107

We show how to convert between partially coherent superpositions of a single photon with the vacuum using linear optics and postselection based on homodyne measurements. We introduce a generalized quantum efficiency for such states and show that any conversion that decreases this quantity is possible. We also prove that our scheme is optimal by showing that no linear optical scheme with generalized conditional measurements, and with one single-rail qubit input can improve the generalized efficiency.

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