Emergent classicality in continuous quantum measurements

Javanainen, Juha and Ruostekoski, Janne (2013) Emergent classicality in continuous quantum measurements. New Journal of Physics, 15 (1). ISSN 1367-2630

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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

Item Type:
Journal Article
Journal or Publication Title:
New Journal of Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
123711
Deposited By:
Deposited On:
23 Feb 2018 11:28
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Nov 2020 05:18