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Coherent dynamics of a flux qubit coupled to a harmonic oscillator

Author

Listed:
  • I. Chiorescu

    (Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
    Michigan State University)

  • P. Bertet

    (Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • K. Semba

    (Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
    NTT Corporation)

  • Y. Nakamura

    (Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES)
    NEC Fundamental Research Laboratories)

  • C. J. P. M. Harmans

    (Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

  • J. E. Mooij

    (Delft University of Technology and Delft Institute for Micro Electronics and Submicron Technology (DIMES))

Abstract

In the emerging field of quantum computation1 and quantum information, superconducting devices are promising candidates for the implementation of solid-state quantum bits (qubits). Single-qubit operations2,3,4,5,6, direct coupling between two qubits7,8,9,10 and the realization of a quantum gate11 have been reported. However, complex manipulation of entangled states—such as the coupling of a two-level system to a quantum harmonic oscillator, as demonstrated in ion/atom-trap experiments12,13 and cavity quantum electrodynamics14—has yet to be achieved for superconducting devices. Here we demonstrate entanglement between a superconducting flux qubit (a two-level system) and a superconducting quantum interference device (SQUID). The latter provides the measurement system for detecting the quantum states; it is also an effective inductance that, in parallel with an external shunt capacitance, acts as a harmonic oscillator. We achieve generation and control of the entangled state by performing microwave spectroscopy and detecting the resultant Rabi oscillations of the coupled system.

Suggested Citation

  • I. Chiorescu & P. Bertet & K. Semba & Y. Nakamura & C. J. P. M. Harmans & J. E. Mooij, 2004. "Coherent dynamics of a flux qubit coupled to a harmonic oscillator," Nature, Nature, vol. 431(7005), pages 159-162, September.
    • Handle: RePEc:nat:nature:v:431:y:2004:i:7005:d:10.1038_nature02831
    DOI: 10.1038/nature02831
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    Cited by:

    1. Skagerstam, Bo-Sture K., 2006. "On collective effects in cavity quantum electrodynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 362(2), pages 314-326.
    2. Vieira, Ronaldo S.S. & Michtchenko, Tatiana A., 2018. "Relativistic chaos in the anisotropic harmonic oscillator," Chaos, Solitons & Fractals, Elsevier, vol. 117(C), pages 276-282.

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