| Issue |
EPL
Volume 97, Number 5, March 2012
|
|
|---|---|---|
| Article Number | 50007 | |
| Number of page(s) | 6 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/97/50007 | |
| Published online | 06 March 2012 | |
Photon sorters and QND detectors using single photon emitters
1
QUANTOP, Niels Bohr Institute, University of Copenhagen - DK-2100 Copenhagen Ø, Denmark, EU
2
Max Planck Institute for Dynamics and Self-Organization (MPIDS) - D-30777 Göttingen, Germany, EU
3
Department of Physics, Harvard University - Cambridge, MA 02138, USA
Received:
30
November
2011
Accepted:
1
February
2012
We discuss a new method for realizing number-resolving and non-demolition photo detectors by strong coupling of light to individual single photon emitters, which act as strong optical non-linearities. As a specific application we show how these elements can be integrated into an error-proof Bell state analyzer, whose efficiency exceeds the best possible performance with linear optics even for a modest atom-field coupling. The methods are error-proof in the sense that every detection event unambiguously projects the photon state onto a Fock or Bell state and imperfections only result in reduced success probability, not in wrong results.
PACS: 03.67.-a – Quantum information / 42.50.Ex – Optical implementations of quantum information processing and transfer / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EPLA, 2012
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