Optimal quantum-enhanced interferometry

Lang, Matthias D. and Caves, Carlton M. (2014) Optimal quantum-enhanced interferometry. Physical Review A, 90 2: . doi:10.1103/PhysRevA.90.025802

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Author Lang, Matthias D.
Caves, Carlton M.
Title Optimal quantum-enhanced interferometry
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
1538-4446
Publication date 2014-08-01
Year available 2014
Sub-type Article (original research)
DOI 10.1103/PhysRevA.90.025802
Open Access Status File (Publisher version)
Volume 90
Issue 2
Total pages 4
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
We analyze the ultimate bounds on the phase sensitivity of an interferometer, given the constraint that the state input to the interferometer's initial 50:50 beam splitter B is a product state of the two input modes. Requiring a product state is a natural restriction: If one were allowed to input an arbitrary, entangled two-mode state |Ξ> to the beam splitter, one could generally just as easily input the state B|Ξ> directly into the two modes after the beam splitter, thus rendering the beam splitter unnecessary. We find optimal states for a fixed photon number and for a fixed mean photon number.
Keyword Phase measurements
Optical metrology
Limit
Entanglement
States
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article ID: 025802

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Created: Sun, 05 Oct 2014, 10:47:08 EST by System User on behalf of Engineered Quantum Systems