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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1997),
  • paper QWD17

Determining the state of a single cavity mode from photon statistics

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Abstract

There has been much recent interest in the measurement of quantum states. That is, the determination of the complete quantum state of a system from a series of measurements where each is performed on a system in the state in question. This topic may be seen as having two distinct parts, both of which have received recent attention. One of these is concerned with how to calculate the state vector or density matrix from the distributions of physical variables that can be measured, and devising schemes to measure those distributions. The second is concerned with how we determine the distributions from the measurement data, and how we calculate the error in our knowledge of those distributions. It is this error that then determines the error in our knowledge of the quantum state. We note in passing that this is essentially a parameter estimation problem for which Bayesian statistical inference has been used as it is a natural approach.

© 1997 Optical Society of America

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