Modern Physics Letters B

STATE MEASUREMENT BY PHOTON FILTERING IN A RING CAVITY

Giacomo Mauro D’Ariano, Lorenzo Maccone, Matteo G. A. Paris, Massimiliano Federico Sacchi

Published Jan 10, 2000• 3 citations

Abstract

We suggest a method for measuring the photon number distribution and the density matrix of a single-mode radiation field. The setup consists of a chain of active ring cavities, each fed by a strong coherent probe and coupled to the signal through cross-Kerr phase modulation. Each cavity is set at resonance by a different Fock component of the signal, so that the detection probability at the cavities output is proportional to the signal photon statistics. The off-diagonal elements of the density matrix can be evaluated by measuring the photon statistics of a set of displaced signal states. The suggested setup allows a reliable state measurement even with low quantum efficiency at detectors.

DOI: 10.1142/s0217984900000045

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