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Quantum Coherence pp 47–81Cite as

Quantum Gates and Decoherence

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Part of the book series: Lecture Notes in Physics ((LNP,volume 689))

Abstract

In this article we are concerned with some possible physical realizations of quantum gates that are useful for quantum information processing. After a brief introduction into the subject, in Sect. 2 we focus on a particular way of using atoms in one-dimensional optical lattices as carriers of the quantum information. As an alternative, in Sect. 3 the information carriers are photons that interact via effective nonlinearities which arises from mixing at passive linear optical elements and postselection through photodetection. These two seemingly different implementations have in common that their decoherence mechanism is described by a single theory, namely that of quantum electrodynamics in causal media which will be the subject of Sect. 4. Figure 1 should serve as an overview of the subject areas covered.

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Authors and Affiliations

  1. Quantum Optics and Laser Science, Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2BW, United Kingdom

    S. Scheel, E.A. Hinds & P.L. Knight

  2. DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge, CB3 0WA, United Kingdom

    J.K. Pachos

Authors
  1. S. Scheel
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  2. J.K. Pachos
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  3. E.A. Hinds
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  4. P.L. Knight
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Walter Pötz Ulrich Hohenester Jaroslav Fabian

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Scheel, S., Pachos, J., Hinds, E., Knight, P. Quantum Gates and Decoherence. In: Pötz, W., Hohenester, U., Fabian, J. (eds) Quantum Coherence. Lecture Notes in Physics, vol 689. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11398448_2

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  • DOI: https://doi.org/10.1007/11398448_2

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  • Print ISBN: 978-3-540-30085-4

  • Online ISBN: 978-3-540-33205-3

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