Effect of dissipation and measurement on a tunneling system

Wielinga, B. and Milburn, G. J. (1995) Effect of dissipation and measurement on a tunneling system. Physical Review a, 52 4: 3323-3332. doi:10.1103/PhysRevA.52.3323

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Author Wielinga, B.
Milburn, G. J.
Title Effect of dissipation and measurement on a tunneling system
Journal name Physical Review a   Check publisher's open access policy
ISSN 1050-2947
Publication date 1995-10
Sub-type Article (original research)
DOI 10.1103/PhysRevA.52.3323
Open Access Status File (Publisher version)
Volume 52
Issue 4
Start page 3323
End page 3332
Total pages 10
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract We consider a parametrically driven Kerr medium in which the pumping may be sinusoidally varied. It has been previously found that this system exhibits coherent tunneling between two fixed points which can be either enhanced or suppressed by altering the driving frequency and strength. We numerically investigate the dynamics when damping is included. This is done both by solving a master equation and using the quantum-trajectory method. In the latter case it is also possible to model the result of a continuous heterodyne measurement of the cavity output. The dissipation destroys the coherences which give rise to the tunneling, causing the sinusoidal oscillation of the mean to give way to a stochastic jumping between the fixed points, manifested as a random telegraph signal. In the quantum-trajectory picture we show that the coherences responsible for tunneling are an exponentially decreasing function of the signal-to-noise ratio for heterodyne measurements. However, evidence of both the bare tunneling rate and the driving modified tunneling rate are still apparent in the random telegraph signal.
Keyword Driven Bistable System
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Engineering Publications
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