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Journal of Physics B Atomic Molecular and Optical Physics

An example of enhancement of a non-classical feature of a light beam by mixing with another classical light beam using a beam splitter

Hari Prakash, Devendra Kumar Mishra

Published Mar 8, 2005• 24 citations
Publisher

Abstract

We present here an example where a non-classical feature of a light beam is enhanced simply by mixing with another classical coherent light beam using a beam splitter. This non-classical feature is amplitude-squared squeezing of a Gaussian light beam expressed by a negative value of or a negative value of the normalized quantity which can become more negative on enhancement. Here, , where and are the density, annihilation and creation operators, respectively.

DOI
10.1088/0953-4075/38/6/005

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We present here an example where a non-classical feature of a light beam is enhanced simply by mixing with another classical coherent light beam using a beam splitter. This non-classical feature is amplitude-squared squeezing of a Gaussian light beam expressed by a negative value of or a negative value of the normalized quantity which can become more negative on enhancement. Here, , where and are the density, annihilation and creation operators, respectively.
In this Letter, we present a simple and versatile scheme for enhancing the nonclassical properties of light states using only linear optics and photodetectors. By combining a coherent state |α〉 and an arbitrary pure state of light |ϕ〉 (excluding coherent states) at two beam splitters, we show that the amplitude α of the coherent state can be tuned to filter out specific Fock components and generate states of light with increased nonclassical features. We provide two examples of input states and demonstrate the effectiveness of our scheme in enhancing the sub-Poissonian statistics or the quadrature squeezing of the output states.