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Most methods for experimentally reconstructing the quantum state of lightinvolve determining a quasiprobability distribution such as the Wignerfunction. In this paper we present a scheme for measuring individual densitymatrix elements in the photon number state representation. Remarkably, thescheme is simple, involving two beam splitters and a reference field in acoherent state.Comment: 6 pages and 1 figur

Measuring the elements of the optical density matrix