Quantum nondemolition measurement of a light field component by a feedback compensated beam splitter

Details Quantum nondemolition measurement of a light field component by a feedback compensated beam splitter Quantum nondemolition measurement of a light field component by a feedback compensated beam splitter

2001-03-19

arxiv.org/abs/quant-ph/0103106v1

Physics

Quantum Physics

6 pages, including one figure

Scientific paper

In conventional quantum nondemolition measurements, the interaction between signal and probe preserves the measured variable. Alternatively, it is possible to restore the original value of the variable by feedback. In this paper, we describe a quantum nondemolition measurement of a quadrature component of the light field using a feedback compensated beam splitter. The noise induced by the vacuum port of the beam splitter is compensated by a linear feedback resulting in an effective amplification of the observed variable. This amplification is then be reversed by optical parametric amplification to restore the original value of the field component.

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