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Journal of Modern Optics

Experimental investigation of a coherent quantum measurement of the degree of polarization of a single-mode light beam

Matthieu Legré, Mark Wegmüller, N. Gisin

Published Jan 1, 2003• 0 citations
Publisher

Abstract

A novel method for the direct measurement of the degree of polarization is described. It is one of the first practical implementations of a coherent quantum measurement, the projection on the singlet state. Our first results demonstrate the successful operation of the method. However, because of the nonlinear crystals used at present, its application is limited to spectral widths larger than about 8 nm.

DOI
10.1080/0950034031000069370

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A scheme is discussed for measuring NNNth-order coherences of two orthogonally polarized light fields in a single spatial mode at very limited experimental cost. To implement the scheme, the only measurements needed are the NNNth-order intensity moments after the light beam has passed through two quarter-wave plates, one half-wave plate, and a polarizing beam splitter for specific settings of the wave plates. It is shown that this method can be applied for arbitrarily large NNN. A set of explicit values is given for the settings of the wave plates, constituting an optimal measurement of the NNNth-order coherences for any NNN. For Fock states the method introduced here corresponds to a full state tomography. Applications of the scheme to systems other than polarization optics are discussed.