Interconvertibility of single-rail optical qubits

Dominic W. Berry*, A. I. Lvovsky, Barry C. Sanders

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)
    16 Downloads (Pure)


    We show how to convert between partially coherent superpositions of a single photon with the vacuum by 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.

    Original languageEnglish
    Pages (from-to)107-109
    Number of pages3
    JournalOptics Letters
    Issue number1
    Publication statusPublished - 1 Jan 2006


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