Photon sorters and QND detectors using single photon emitters

Abstract

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.

revised and enlarged version, 6+ pages, 5 figures

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• A coherent spin-photon interface with waveguide induced cycling transitions
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• Numerical modelling of the coupling efficiency of single quantum emitters in photonic-crystal waveguides
• Quantum nonlinear metasurfaces from dual arrays of ultracold atoms
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• Limitations of two-level emitters as non-linearities in two-photon controlled phase gates
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• On-chip spin-photon entanglement based on single-photon scattering
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• Quantum state transfer between a frequency-encoded photonic qubit and a quantum dot spin in a nanophotonic waveguide