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arxiv: quant-ph/0209132 · v1 · submitted 2002-09-25 · 🪐 quant-ph

Measuring the elements of the optical density matrix

classification 🪐 quant-ph
keywords statedensityelementsmatrixmeasuringschemebeamcoherent
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Most methods for experimentally reconstructing the quantum state of light involve determining a quasiprobability distribution such as the Wigner function. In this paper we present a scheme for measuring individual density matrix elements in the photon number state representation. Remarkably, the scheme is simple, involving two beam splitters and a reference field in a coherent state.

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