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Related Experiment Videos

Macroscopic tunnel splittings in superconducting phase qubits.

Philip R Johnson1, William T Parsons, Frederick W Strauch

  • 1Department of Physics, University of Maryland, College Park, MD 20850, USA. philipj@physics.umd.edu

Physical Review Letters
|May 21, 2005
PubMed
Summary

Macroscopic resonant tunneling explains fine spectral splittings in superconducting phase qubits, offering a new perspective on decoherence and improving qubit coherence times for quantum computing.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Decoherence

Background:

  • Prototype Josephson-junction based qubits exhibit short coherence times, hindering quantum computing advancements.
  • Observed fine splittings in superconducting phase qubit spectra were previously attributed to unknown microresonator decoherence sources.

Purpose of the Study:

  • To investigate macroscopic resonant tunneling as an alternative explanation for observed spectral fine splittings in phase qubits.
  • To determine if this phenomenon can account for previously unexplained decoherence in superconducting qubits.

Main Methods:

  • Theoretical modeling of an extremely asymmetric double-well potential characteristic of phase qubits.
  • Analysis of the observational consequences of macroscopic resonant tunneling within this potential.

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Main Results:

  • Macroscopic resonant tunneling in the phase qubit's double-well potential produces observational consequences.
  • These consequences closely resemble the fine spectral splittings observed in recent experiments.

Conclusions:

  • Macroscopic resonant tunneling provides a compelling explanation for the observed spectral fine splittings.
  • This finding offers a new avenue for mitigating decoherence and enhancing qubit coherence times for practical quantum computing.