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Related Experiment Videos

One-shot quantum measurement using a hysteretic dc SQUID.

O Buisson1, F Balestro, J P Pekola

  • 1Centre de Recherches sur les Très Basses Températures, Laboratoire associé à l'Université Joseph Fourier, CNRS, B.P. 166, 38042 Grenoble Cedex 9, France.

Physical Review Letters
|July 15, 2003
PubMed
Summary

We present a single-shot quantum measurement technique for determining the state of a Josephson charge qubit. This method utilizes a superconducting quantum interference device (dc SQUID) and macroscopic quantum tunneling for readout.

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Area of Science:

  • Quantum computing and information science.
  • Superconducting circuit quantum electrodynamics.
  • Quantum measurement and control.

Background:

  • Josephson charge qubits, specifically Cooper pair boxes, are fundamental units in quantum computing.
  • Accurate and efficient state determination is crucial for quantum computation.
  • Superconducting quantum interference devices (SQUIDs) are sensitive magnetic flux detectors.

Purpose of the Study:

  • To propose and analyze a novel single-shot quantum measurement scheme for a Josephson charge qubit.
  • To leverage macroscopic quantum tunneling for qubit state readout.
  • To assess the feasibility of the proposed measurement technique using realistic experimental parameters.

Main Methods:

  • Coupling a Cooper pair box (qubit) to a two-junction dc SQUID (measuring device).

Related Experiment Videos

  • Employing macroscopic quantum tunneling from the supercurrent state for signal readout.
  • Analyzing qubit phase fluctuations and simulating the system with realistic circuit parameters.

    • Main Results:

    • Demonstrated the analogy between the coupled qubit-SQUID system and a single atom in a high-Q cavity.
    • Identified macroscopic quantum tunneling as a viable mechanism for single-shot readout.
    • Validated the feasibility of the proposed measurement scheme through parameter analysis.

    Conclusions:

    • The proposed single-shot measurement offers a promising approach for determining the state of Josephson charge qubits.
    • The integration of dc SQUID and macroscopic quantum tunneling provides an effective readout mechanism.
    • This technique has potential implications for advancing the development of superconducting quantum computers.