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Cool for Cats

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Cooling for a cat In this figure we show, by making use of Wigner functions, the effect of two different environmentson a ring prepared in a coherent state biased at zero  ux. Each graph contains a top down view with a three dimensional plot of the function as a not to fixed scale inset.

Cooling for a cat In this figure we show, by making use of Wigner functions, the effect of two different environments
on a ring prepared in a coherent state biased at zero flux. Each graph contains a top down view with a three dimensional plot of the function as a not to fixed scale inset.

M. J. Everitt, T. P. Spiller, G. J. Milburn, R. D. Wilson, A. M. Zagoskin
The iconic Schrödinger’s cat state describes a system that may be in a superposition of two macroscopically distinct states, for example two clearly separated oscillator coherent states. Quite apart from their role in understanding the quantum classical boundary, such states have been suggested as offering a quantum advantage for quantum metrology, quantum communication and quantum computation. As is well know these applications have to face the difficulty that the irreversible interaction with an environment causes the superposition to rapidly evolve to a mixture of the component states in the case that the environment is not monitored. Here we show that by engineering the interaction with the environment the system can evolve irreversibly to a cat state. To be precise we show that it is possible to engineer an irreversible process so that the steady state is close to a pure Schrödinger’s cat state by using a bistable system and an environment comprising two-photon (or phonon) absorbers. We also show that it should be possible to prolong the lifetime of a Schrödinger’s cat state exposed to the destructive effects of a conventional single-photon decohering environment. Our protocol should make it easier to prepare and maintain Schrödinger cat states which would be useful in applications of quantum metrology and information processing as well as being of interest to those probing the quantum to classical transition.
Read more: http://arxiv.org/pdf/1212.4795v1.pdf

Written by physicsgg

December 20, 2012 at 9:15 am

Posted in QUANTUM PHYSICS

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