Multi-mode density matrices of light via amplitude and phase control

Details Multi-mode density matrices of light via amplitude and phase control Multi-mode density matrices of light via amplitude and phase control

1996-04-22

arxiv.org/abs/quant-ph/9604020v1

Physics

Quantum Physics

6 pages, latex

Scientific paper

10.1016/S0030-4018(96)00548-2

A new method is described for determining the quantum state of correlated multimode radiation by interfering the modes and measuring the statistics of the superimposed fields in four-port balanced homodyne detection. The full information on the $N$-mode quantum state is obtained by controlling both the relative amplitudes and the phases of the modes, which simplifies the reconstruction of density matrices to only $N+1$ Fourier transforms. In particular, this method yields time-correlated multimode density matrices of optical pulses by superimposing the signal by a sequence of short local-oscillator pulses.

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