Abstract

Nonclassical states of the light, e.g., single-photon states¹ and squeezed states,² are now available in the laboratory; these states exhibit some properties one cannot account for using a classical wave model for light. One main issue Involved In the realization of nonclassical states is their use in Interference experiments. For example, single-photon interference has a great historical importance in basic concepts of quantum mechanics. Actually, wave/particle duality for the photon can be demonstrated straightforwardly in a single-photon interference experiment. On the other hand, high-precision interferometry was the first motivation for research on squeezed states. The aim is to improve on the noise limit, which limits the of very small phase shift measurements.³ A squeezed-state interferometer design is described in a related paper.⁴

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