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Coherent oscillations in a superconducting multilevel quantum system.

J Claudon1, F Balestro, F W J Hekking

  • 1Centre de Recherches sur les Très Basses Tempèratures, laboratoire associé à l'Universitè Joseph Fourier, CNRS, BP 166, 38042 Grenoble cedex 9, France.

Physical Review Letters
|November 5, 2004
PubMed
Summary

Researchers observed coherent oscillations in a multilevel quantum system using a dc SQUID. The study reveals how microwave power affects these quantum oscillations, deviating from simple two-level system predictions.

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Area of Science:

  • Quantum physics
  • Superconducting quantum circuits

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are sensitive magnetometers.
  • Understanding quantum phenomena in multilevel systems is crucial for quantum technologies.

Purpose of the Study:

  • To investigate coherent oscillations in a multilevel quantum system.
  • To explore the influence of microwave power on these oscillations.
  • To analyze the system's behavior beyond the two-level approximation.

Main Methods:

  • Utilized a current-biased dc SQUID as the multilevel quantum system.
  • Applied resonant microwave pulses of flux to induce coherent oscillations.
  • Performed quantum measurements using nanosecond flux pulses for state readout.
  • Varied microwave power to observe changes in oscillation characteristics.

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Main Results:

  • Observed coherent oscillations in the dc SQUID system.
  • Demonstrated that oscillation frequency deviates from linear dependence on microwave power.
  • Showed that the number of involved quantum states increases with microwave power.

Conclusions:

  • The observed phenomena are well-explained by a theoretical model considering system anharmonicity.
  • The study highlights the importance of multilevel system dynamics in quantum devices.
  • Findings contribute to the understanding and control of quantum states in SQUIDs.