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International Conference on Quantum Information

Entangled Coherent States, Heisenberg-Limited Interferometry, and Related Issues

Christopher C. Gerry, Adil Benmoussa

Published Jan 1, 2008• 0 citations
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Abstract

We discuss the generation of two mode maximally entangled coherent states using a weak nonlinear medium. We then discuss their applications to quantum metrology (Heisenberg-limited interferometry), quantum lithography, and violations of Bell-type inequalities.
DOI
10.1364/icqi.2008.jmb62

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Maximally entangled photonic states of a two-mode field have applications in Heisenberg-limit interferometry and in photolithography where they may be used to transfer images with resolutions exceeding the Rayleigh diffraction limit. In a recent paper by one of us [C. C. Gerry, Phys. Rev. A 61, 043811 (2000)] it was shown that a nonlinear four-wave mixer could produce the requisite states for input states containing only even photon numbers. For superpositions of even number states the output is just a superposition of maximally entangled even states. In the present paper we extend the earlier work to consider both even coherent states and squeezed vacuum states as inputs and study their applications to interferometry and lithography.