Optimized Double-Well Quantum Interferometry with Gaussian Squeezed States
Journal Article
·
· Physical Review Letters
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
A Mach-Zender interferometer with a Gaussian number-difference squeezed input state can exhibit sub-shot-noise phase resolution over a large phase interval. We derive the optimal level of squeezing for a given phase interval {delta}{theta}{sub 0} and particle number N. We then propose an adaptive measurement sequence in which the amount of squeezing is increased with each measurement. With this scheme, any phase on (-{delta}{theta}{sub 0},{delta}{theta}{sub 0}) can be measured with a precision of 3.5/N, requiring only 2-4 measurements, provided only that Ntan({delta}{theta}{sub 0})<10{sup 40}. In a double-well Bose-Einstein condensate, the optimized input states can be created by adiabatic manipulation of the ground state.
- OSTI ID:
- 21134063
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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