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Opt Express. 2008 Dec 22;16(26):21462-75.

Quantum nondemolition measurement of photon number via optical Kerr effect in an ultra-high-Q microtoroid cavity.

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Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA.


We theoretically investigate a quantum nondemolition (QND) measurement with optical Kerr effect in an ultra-high-Q microtoroidal system. The analytical and numerical results predict that the present QND measurement scheme possesses a high sensitivity, which allows for detecting few photons or even single photons. Ultra-high-Q toroidal microcavity may provide a novel experimental platform to study quantum physics with nonlinear optics at low light levels.


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