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Cool for cats

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posted on 2016-05-20, 09:59 authored by Mark EverittMark Everitt, T.P. Spiller, G.J. Milburn, Richard D. Wilson, Alexandre ZagoskinAlexandre 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 known 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 there exists a large class of systems that 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 Schr\"odinger's cat state by using double well systems and an environment comprising two-photon (or phonon) absorbers. We also show that it should be possible to prolong the lifetime of a Schr\"odinger'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 Schr\"odinger 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.

History

School

  • Science

Department

  • Physics

Citation

EVERITT, M.J. ...et al., Cool for cats. arXiv:1212.4795v2 [quant-ph]

Publisher

arXiv.org

Version

  • SMUR (Submitted Manuscript Under Review)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2012

Notes

This pre-print was submitted to arXiv on 27 Feb 2013. It was subsequently published as "Engineering dissipative channels for realizing Schrödinger cats in SQUIDs" https://dspace.lboro.ac.uk/2134/21296

Language

  • en

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