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Physica A Statistical Mechanics and its Applications

Non-classicality and coherence of squeezed states

Reinhard Honegger, Alfred Rieckers

Published Jan 16, 2004• 2 citations
Publisher
DOI
10.1016/j.physa.2003.12.022

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Victor Kozlov's reply

Victor Kozlov

We prove formal identity of the dispersed states and the two-photon coherent states. As the last fall in the class of squeezed states and are non-classical, so are the dispersed states. A state which exhibits squeezing and/or non-classicality should not be called coherent as suggested in the Comment.

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Abstract The scheme of an arrangement is considered for the preparation of some non-classical superposed states from squeezed states by using the optical parametric amplifier (OPA) apparatus, which is based on an idea recently proposed to generate photon-added states from the coherent states of light. This technique allows one to obtain linear combinations of squeezed vacuum states (SVSs) and n-photon-added squeezed vacuum states (n-PASVSs), that can enrich the non-classicality of the SVSs and n-PASVSs and improve their performances in quantum information protocols. Their characteristics are greatly affected by the gain of the OPA and the coherent field amplitude (or, mean number of photons). For this purpose, a comprehensive analysis of the non-classical features of these states has been presented in four different behavioral regimes, i.e. low- and high-gain regimes in the presence of weak and strong coherent fields. Finally, the role of the gain parameter of the light state from OPA as one of the input states of the Mach–Zehnder interferometer (MZI) apparatus in phase sensitivity optimization is discussed.