Quantum Zeno Effect in the Quantum Non-Demolition Detection of Itinerant Photons

Details Quantum Zeno Effect in the Quantum Non-Demolition Detection of Itinerant Photons Quantum Zeno Effect in the Quantum Non-Demolition Detection of Itinerant Photons

2007-12-12

arxiv.org/abs/0712.1908v2

Phys. Rev. A 79, 052115 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4.5 pages, 3 figures

Scientific paper

We analyze the detection of itinerant photons using a quantum non-demolition (QND) measurement. We show that the backaction due to the continuous measurement imposes a limit on the detector efficiency in such a scheme. We illustrate this using a setup where signal photons have to enter a cavity in order to be detected dispersively. In this approach, the measurement signal is the phase shift imparted to an intense beam passing through a second cavity mode. The restrictions on the fidelity are a consequence of the Quantum Zeno effect, and we discuss both analytical results and quantum trajectory simulations of the measurement process.

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