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Initial decoherence in solid state qubits.

G Falci1, A D'Arrigo, A Mastellone

  • 1Dipartimento di Metodologie Fisiche e Chimiche, Universitá di Catania, Viale A. Doria 6, 95125 Catania, Italy. gfalci@dmfci.unict.it

Physical Review Letters
|May 21, 2005
PubMed
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We investigated decoherence in Josephson qubits caused by low-frequency noise from impurities. This noise leads to signal broadening and complex quantum phenomena in charge-based devices.

Area of Science:

  • Quantum Computing
  • Solid State Physics
  • Materials Science

Background:

  • Josephson qubits are fundamental to quantum computing.
  • Decoherence is a major challenge limiting qubit performance.
  • Low-frequency noise from impurities is a known source of decoherence.

Purpose of the Study:

  • To analyze decoherence mechanisms in Josephson qubits.
  • To investigate the impact of non-Markovian classical noise from impurities.
  • To extend theoretical models to include high-frequency quantum noise.

Main Methods:

  • Theoretical modeling of decoherence.
  • Analysis of non-Markovian classical noise effects.
  • Inclusion of high-frequency quantum noise from environmental sources.

Related Experiment Videos

Main Results:

  • Non-Markovian classical noise from switching impurities causes inhomogeneous signal broadening.
  • High-frequency quantum noise, from impurities or the environment, was incorporated into the theory.
  • The interplay between slow and non-Gaussian noise sources explains observed quantum phenomena.

Conclusions:

  • Low-frequency noise significantly impacts Josephson qubit coherence.
  • A comprehensive model including various noise sources is crucial for understanding qubit dynamics.
  • This research provides insights into optimizing qubit performance by mitigating noise effects.