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Decoherence of a Quantum Bit Circuit

  • Chapter
Quantum Decoherence

Part of the book series: Progress in Mathematical Physics ((PMP,volume 48))

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Abstract

Solid state quantum bit circuits (qubits) are candidates for the implementation of quantum processors, which can in principle perform some computational tasks beyond reach of classical sequential processors. Decoherence is there a key issue since electrical circuits are more prone to decoherence than microscopic objects such as atoms. We introduce the different families of solid state qubits, which are either based on single particle states in semiconductor nanostructures, or on global quantum states of superconducting Josephson circuits. We treat more in detail the Cooper pair box Josephson circuit, and the quantronium circuit derived from it. In this device, a decoupling strategy of the circuit from the outside circuitry allows to improve quantum coherence. We expose results obtained on the manipulation of the qubit state in the quantronium. We develop a general framework for understanding decoherence in qubit circuits, and show how coherence time measurements allow to characterize noise sources coup.

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Author information

Authors and Affiliations

  1. Quantronics SPEC, CEA-Saclay, F-91191, Gif-sur-Yvette

    Grégoire Ithier, François Nguyen, Eddy Collin, Nicolas Boulant, Phil J. Meeson, Philippe Joyez, Denis Vion & Daniel Estève

Authors
  1. Grégoire Ithier
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  2. François Nguyen
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  3. Eddy Collin
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  4. Nicolas Boulant
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  5. Phil J. Meeson
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  6. Philippe Joyez
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  7. Denis Vion
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  8. Daniel Estève
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Editor information

Editors and Affiliations

  1. Service de Physique Théorique Orme des Merisiers, CEA - Saclay, 91191, Gif-sur-Yvette Cedex, France

    Bertrand Duplantier

  2. Laboratoire Kastler Brossel Département de Physique, de l’Ecole Normale Supérieure, 24, rue Lhomond, 75231, Paris Cedex 05, France

    Jean-Michel Raimond

  3. Laboratoire de Physique Théorique, Université Paris XI, 91405, Orsay Cedex, France

    Vincent Rivasseau

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© 2006 Birkhäuser Verlag Basel

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Ithier, G. et al. (2006). Decoherence of a Quantum Bit Circuit. In: Duplantier, B., Raimond, JM., Rivasseau, V. (eds) Quantum Decoherence. Progress in Mathematical Physics, vol 48. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-7808-0_4

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