Detecting drift of quantum sources: not the de Finetti theorem

Details Detecting drift of quantum sources: not the de Finetti theorem Detecting drift of quantum sources: not the de Finetti theorem

2011-02-22

arxiv.org/abs/1102.4560v2

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

We propose and analyze a method to detect and characterize the drift of a nonstationary quantum source. It generalizes a standard measurement for detecting phase diffusion of laser fields to quantum systems of arbitrary Hilbert space dimension, qubits in particular. We distinguish diffusive and systematic drifts, and examine how quickly one can determine that a source is drifting. We show that for single-photon wavepackets our measurement is implemented by the Hong-Ou-Mandel effect.

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