Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/202737

Download PDF (Published version) (Adobe Acrobat PDF, -1 bytes)

Title

Long-lived periodic revivals of coherence in an interacting Bose-Einstein condensate

Author(s)

Egorov, M.;  Anderson, R. P.;  Ivannikov, V.;  Opanchuk, B.;  Drummond, P. D.;  Hall, B. V.;  Sidorov, A. I.

Abstract

We observe the coherence of an interacting two-component Bose-Einstein condensate (BEC) surviving for seconds in a trapped Ramsey interferometer. Mean-field-driven collective oscillations of two components lead to periodic dephasing and rephasing of condensate wave functions with a slow decay of the interference fringe visibility. We apply spin echo synchronous with the self-rephasing of the condensate to reduce the influence of state-dependent atom losses, significantly enhancing the visibility up to 0.75 at the evolution time of 1.5 s. Mean-field theory consistently predicts higher visibility than experimentally observed values. We quantify the effects of classical and quantum noise and infer a coherence time of 2.8 s for a trapped condensate of 5.5×104 interacting atoms.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy

Source

Physical Review A, Vol. 84, no. 2 (Aug 2011), article no. 021605(R)

Publication year

2011

FOR Code(s)

0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics;  0205 Optical Physics;  0204 Condensed Matter Physics

Keyword(s)

Atomic and molecular physics;  Bose-Einstein condensate;  Interacting atoms;  Ramsey interferometer;  Spin echo

Publisher

American Physical Society

ISSN

1050-2947

Publisher URL

http://dx.doi.org/10.1103/PhysRevA.84.021605

Copyright

Copyright © 2011 American Physical Society. Published version of the paper reproduced here in accordance with the copyright policy of the publisher.

Full text

Peer reviewed