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Proceedings Paper

Density matrix approach to the Heisenberg-limited interferometry: an example
Author(s): Aravind Chiruvelli; Hwang Lee
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Paper Abstract

It has been known for a while that, provided by the Heisenberg Uncertainty Principle, certain types of quantum correlated light should yield a better scaling law than the one with ordinary laser light. Hitherto, however, there is no such device practically used outside laboratories. The fact that quantum correlations are easy to be destroyed under decoherence essentially makes their utilities problematic for real world applications. For the optical interferometers, the most significant decoherence phenomenon is the photon loss. And yet, there has been no real-world device for quantum-enhanced sensing that overcomes the photon loss effects. In order to analyze the photon loss effects the description of the quantum states of light calls for a density matrix formalism, rather than the usual pure state approach. Here we take an example of the input states for the Heisenberg-limited interferometry, namely the optimal state, and show the description of the quantum state of light based on the reduced density matrix.

Paper Details

Date Published: 2 February 2009
PDF: 7 pages
Proc. SPIE 7225, Advanced Optical Concepts in Quantum Computing, Memory, and Communication II, 72250T (2 February 2009); doi: 10.1117/12.816041
Show Author Affiliations
Aravind Chiruvelli, Louisiana State Univ. (United States)
Hwang Lee, Louisiana State Univ. (United States)

Published in SPIE Proceedings Vol. 7225:
Advanced Optical Concepts in Quantum Computing, Memory, and Communication II
Zameer U. Hasan; Alan E. Craig; Philip R. Hemmer, Editor(s)

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