Homodyne Measurements on a Bose-Einstein Condensate

Details Homodyne Measurements on a Bose-Einstein Condensate Homodyne Measurements on a Bose-Einstein Condensate

1997-12-24

arxiv.org/abs/cond-mat/9712282v2

J. F. Corney and G. J. Milburn, Phys. Rev. A 58, 2399 (1998)

Physics

Condensed Matter

8 pages, 12 figures to appear in PRA

Scientific paper

10.1103/PhysRevA.58.2399

We investigate a non-destructive measurement technique to monitor Josephson-like oscillations between two spatially separated neutral atom Bose-Einstein condensates. One condensate is placed in an optical cavity, which is strongly driven by a coherent optical field. The cavity output field is monitored using a homodyne detection scheme. The cavity field is well detuned from an atomic resonance, and experiences a dispersive phase shift proportional to the number of atoms in the cavity. The detected current is modulated by the coherent tunneling oscillations of the condensate. Even when there is an equal number of atoms in each well initially, a phase is established by the measurement process and Josephson-like oscillations develop due to measurement back-action noise alone.

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