Emergent classicality in continuous quantum measurements
Emergent classicality in continuous quantum measurements
We develop a classical theoretical description for nonlinear many-body dynamics that incorporates the back-action of a continuous measurement process. The classical approach is compared with the exact quantum solution in an example with an atomic Bose–Einstein condensate in a double-well potential where the atom numbers in both potential wells are monitored by light scattering. In the classical description, the back-action of the measurements appears as diffusion of the relative phase of the condensates on each side of the trap. When the measurements are frequent enough to resolve the system dynamics, the system behaves classically. This happens even deep in the quantum regime, and demonstrates how classical physics emerges from quantum mechanics as a result of measurement back-action
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Javanainen, Juha
ae127878-c1cf-4e23-bebb-c3ec76b61081
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
3 January 2013
Javanainen, Juha
ae127878-c1cf-4e23-bebb-c3ec76b61081
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Javanainen, Juha and Ruostekoski, Janne
(2013)
Emergent classicality in continuous quantum measurements.
New Journal of Physics, 15 (1), .
(doi:10.1088/1367-2630/15/1/013005).
Abstract
We develop a classical theoretical description for nonlinear many-body dynamics that incorporates the back-action of a continuous measurement process. The classical approach is compared with the exact quantum solution in an example with an atomic Bose–Einstein condensate in a double-well potential where the atom numbers in both potential wells are monitored by light scattering. In the classical description, the back-action of the measurements appears as diffusion of the relative phase of the condensates on each side of the trap. When the measurements are frequent enough to resolve the system dynamics, the system behaves classically. This happens even deep in the quantum regime, and demonstrates how classical physics emerges from quantum mechanics as a result of measurement back-action
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Published date: 3 January 2013
Organisations:
Applied Mathematics
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Local EPrints ID: 346613
URI: http://eprints.soton.ac.uk/id/eprint/346613
PURE UUID: 41ca78bb-64c9-451d-b695-5a979edd1e72
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Date deposited: 04 Jan 2013 10:19
Last modified: 14 Mar 2024 12:39
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Author:
Juha Javanainen
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