Measurement backaction on the quantum spin-mixing dynamics of a spin-1 Bose-Einstein condensate

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.063624· OSTI ID:21550169

Keye, Zhang; Lu, Zhou; Weiping, Zhang ^[1]; Ling, Hong Y ^[2]; Han, Pu ^[3]

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1. Quantum Institute for Light and Atoms, Department of Physics, East China Normal University, Shanghai 200062 (China)
2. Department of Physics and Astronomy, Rowan University, Glassboro, New Jersey 08028-1700 (United States)
3. Department of Physics and Astronomy, and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892 (United States)

We consider a small F=1 spinor condensate inside an optical cavity driven by an optical probe field, and subject the output of the probe to a homodyne detection, with the goal of investigating the effect of measurement backaction on the spin dynamics of the condensate. Using the stochastic master equation approach, we show that the effect of backaction is sensitive to not only the measurement strength but also the quantum fluctuation of the spinor condensate. The same method is also used to estimate the atom numbers below which the effect of backaction becomes so prominent that extracting spin dynamics from this cavity-based detection scheme is no longer practical.

• OSTI ID: 21550169
• Journal Information: Physical Review. A, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevA.83.063624; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
BOSE-EINSTEIN CONDENSATION
CAVITIES
DETECTION
FLUCTUATIONS
MIXED STATES
QUANTUM MECHANICS
SPIN
SPINORS
STOCHASTIC PROCESSES
ANGULAR MOMENTUM
MECHANICS
PARTICLE PROPERTIES
QUANTUM STATES
VARIATIONS