Controlling spontaneous-emission noise in measurement-based feedback cooling of a Bose-Einstein condensate

Hush, M. R., Szigeti, S. S., Carvalho, A. R. R. and Hope, J. J. (2013) Controlling spontaneous-emission noise in measurement-based feedback cooling of a Bose-Einstein condensate. New Journal of Physics, 15 113060.1-113060.33. doi:10.1088/1367-2630/15/11/113060


Author Hush, M. R.
Szigeti, S. S.
Carvalho, A. R. R.
Hope, J. J.
Title Controlling spontaneous-emission noise in measurement-based feedback cooling of a Bose-Einstein condensate
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2013-11-01
Sub-type Article (original research)
DOI 10.1088/1367-2630/15/11/113060
Open Access Status DOI
Volume 15
Start page 113060.1
End page 113060.33
Total pages 33
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract Off-resonant optical imaging is a popular method for continuous monitoring of a Bose–Einstein condensate. However, the disturbance caused by scattered photons places a serious limitation on the lifetime of such continuously monitored condensates. In this paper, we demonstrate that a new choice of feedback control can overcome the heating effects of the measurement backaction. In particular, we show that the measurement backaction caused by off-resonant optical imaging is a multi-mode quantum-field effect, as the entire heating process is not seen in single-particle or mean-field models of the system. Simulating such continuously monitored systems is possible with the number-phase Wigner particle filter, which currently gives both the highest precision and largest timescale simulations amongst competing methods. It is a hybrid between the leading techniques for simulating non-equilibrium dynamics in condensates and particle filters for simulating high-dimensional non-Gaussian filters in the field of engineering. The new control scheme will enable long-term continuous measurement and feedback on one of the leading platforms for precision measurement and the simulation of quantum fields, allowing for the possibility of single-shot experiments, adaptive measurements and robust state-preparation and manipulation.
Keyword Positive P Representation
Spatial Light-Modulation
Quantum Dynamics
Stochastic Volatility
Particle Filters
Relative Phase
Gases
Tracking
Simulations
Backaction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
 
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