Dominic W Berry et al 2004 New J. Phys. 6 93 doi:10.1088/1367-2630/6/1/093
Post-processing with linear optics for improving the quality of single-photon sources
Focus on Single Photons on DemandDominic W Berry1, Stefan Scheel2, Casey R Myers3, Barry C Sanders1,4, Peter L Knight2 and Raymond Laflamme3,5
Show affiliationsPart of Focus on Single Photons on Demand
Triggered single-photon sources produce the vacuum state with non-negligible probability, but produce a much smaller multiphoton component. It is therefore reasonable to approximate the output of these photon sources as a mixture of the vacuum and single-photon states. We show that it is impossible to increase the probability for a single photon using linear optics and photodetection on fewer than four modes. This impossibility is due to the incoherence of the inputs; if the inputs were pure-state superpositions, it would be possible to obtain a perfect single-photon output. In the more general case, a chain of beam splitters can be used to increase the probability for a single photon, but at the expense of adding an additional multiphoton component. This improvement is robust against detector inefficiencies, but is degraded by distinguishable photons, dark counts or multiphoton components in the input.
- PACS
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42.79.Fm Reflectors, beam splitters, and deflectors
03.67.Lx Quantum computation architectures and implementations
- Subjects
- Dates
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Issue 1 (July 2004)
Received 3 February 2004
Published 29 July 2004
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