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Coupling superconducting qubits via a cavity bus

Author

Listed:
  • J. Majer

    (Yale University, New Haven, Connecticut 06520, USA)

  • J. M. Chow

    (Yale University, New Haven, Connecticut 06520, USA)

  • J. M. Gambetta

    (Yale University, New Haven, Connecticut 06520, USA)

  • Jens Koch

    (Yale University, New Haven, Connecticut 06520, USA)

  • B. R. Johnson

    (Yale University, New Haven, Connecticut 06520, USA)

  • J. A. Schreier

    (Yale University, New Haven, Connecticut 06520, USA)

  • L. Frunzio

    (Yale University, New Haven, Connecticut 06520, USA)

  • D. I. Schuster

    (Yale University, New Haven, Connecticut 06520, USA)

  • A. A. Houck

    (Yale University, New Haven, Connecticut 06520, USA)

  • A. Wallraff

    (Yale University, New Haven, Connecticut 06520, USA
    Present addresses: Department of Physics, ETH Zurich, CH-8093 Zürich, Switzerland (A.W.); Département de Physique et Regroupement Québécois sur les Matériaux de Pointe, Université de Sherbrooke, Sherbrooke, Québec, J1K2R1 Canada (A.B.).)

  • A. Blais

    (Yale University, New Haven, Connecticut 06520, USA
    Present addresses: Department of Physics, ETH Zurich, CH-8093 Zürich, Switzerland (A.W.); Département de Physique et Regroupement Québécois sur les Matériaux de Pointe, Université de Sherbrooke, Sherbrooke, Québec, J1K2R1 Canada (A.B.).)

  • M. H. Devoret

    (Yale University, New Haven, Connecticut 06520, USA)

  • S. M. Girvin

    (Yale University, New Haven, Connecticut 06520, USA)

  • R. J. Schoelkopf

    (Yale University, New Haven, Connecticut 06520, USA)

Abstract

Catching the quantum bus Microfabricated superconducting circuit elements can harness the power of quantum behaviour for information processing. Unlike classical information bits, quantum information bits (qubits) can form superpositions or mixture states of ON and OFF, offering a faster, natural form of parallel processing. Previously, direct qubit–qubit coupling has been achieved for up to four qubits, but now two independent groups demonstrate the next crucial step: communication and exchange of quantum information between two superconducting qubits via a quantum bus, in the form of a resonant cavity formed by a superconducting transmission line a few millimetres long. Using this microwave cavity it is possible to store, transfer and exchange quantum information between two quantum bits. It can also perform multiplexed qubit readout. This basic architecture lends itself to expansion, offering the possibility for the coherent interaction of many superconducting qubits. The cover illustrates a zig-zag-shaped resonant cavity or quantum bus linking two superconducting phase qubits.

Suggested Citation

  • J. Majer & J. M. Chow & J. M. Gambetta & Jens Koch & B. R. Johnson & J. A. Schreier & L. Frunzio & D. I. Schuster & A. A. Houck & A. Wallraff & A. Blais & M. H. Devoret & S. M. Girvin & R. J. Schoelko, 2007. "Coupling superconducting qubits via a cavity bus," Nature, Nature, vol. 449(7161), pages 443-447, September.
    • Handle: RePEc:nat:nature:v:449:y:2007:i:7161:d:10.1038_nature06184
    DOI: 10.1038/nature06184
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    Cited by:

    1. Kafri, Yariv, 2015. "Fluctuations in driven systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 418(C), pages 154-169.
    2. Xiaoxuan Pan & Zhide Lu & Weiting Wang & Ziyue Hua & Yifang Xu & Weikang Li & Weizhou Cai & Xuegang Li & Haiyan Wang & Yi-Pu Song & Chang-Ling Zou & Dong-Ling Deng & Luyan Sun, 2023. "Deep quantum neural networks on a superconducting processor," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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