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キーワード:
Quantum Physics (quant-ph) Computational physics Optics, quantum optics and lasers Quantum information and quantum mechanics
要旨:
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 nonlinearities.
As a speci c application we show how these elements can be integrated into an error-proof
Bell state analyzer, whose e ciency exceeds the best possible performance with linear optics even
for a modest atom- eld 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.
