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Proceedings Paper

Coherent mixed with squeezed vacuum light interferometry: parity detection hits the Heisenberg limit
Author(s): Kaushik Seshadreesan; Petr Anisimov; Hwang Lee; Jonathan Dowling
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Paper Abstract

Mach-Zehnder interferometry based on mixing the coherent and the squeezed vacuum states of light has Heisenberg limited capabilities for phase estimation. This is also, because the quantum Cramer-Rao bound on sensitivity of phase estimation with the above interferometric scheme reaches the Heisenberg limit when the inputs are mixed in hear equal proportions. We show that a detection strategy based on the measurement of parity of photon number in one of the output modes of the interferometer saturates the quantum Cramer-Rao bound of the interferometric scheme, and therefore- as a consequence- hits the Heisenberg limit when the inputs are mixed in equal intensities.

Paper Details

Date Published: 23 February 2012
PDF: 5 pages
Proc. SPIE 8272, Advances in Photonics of Quantum Computing, Memory, and Communication V, 82720N (23 February 2012); doi: 10.1117/12.910803
Show Author Affiliations
Kaushik Seshadreesan, Louisiana State Univ. (United States)
Petr Anisimov, Louisiana State Univ. (United States)
Hwang Lee, Louisiana State Univ. (United States)
Jonathan Dowling, Louisiana State Univ. (United States)


Published in SPIE Proceedings Vol. 8272:
Advances in Photonics of Quantum Computing, Memory, and Communication V
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Charles M. Santori, Editor(s)

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