Interconvertibility of single-rail optical qubits
Optics Letters, Vol. 31, Issue 1, pp. 107-109 doi:10.1364/OL.31.000107
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- OCIS Codes:
- (270.5290) Quantum optics : Photon statistics
- (270.5570) Quantum optics : Quantum detectors
Quantum Optics
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Dominic W. Berry, A. I. Lvovsky, and Barry C. Sanders, "Interconvertibility of single-rail optical qubits," Opt. Lett. 31, 107-109 (2006)
http://www.opticsinfobase.org/abstract.cfm?URI=ol-31-1-107
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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.
© 2006 Optical Society of America
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