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Related Experiment Videos

Decoherence in josephson phase qubits from junction resonators.

R W Simmonds1, K M Lang, D A Hite

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305-3328, USA.

Physical Review Letters
|August 25, 2004
PubMed
Summary

Researchers discovered microscopic two-level systems within Josephson junction qubits, which cause decoherence and limit quantum computing performance. This finding impacts the future of Josephson technologies and quantum computing advancements.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics

Background:

  • Josephson junction qubits are promising for quantum computing.
  • The primary mechanisms causing decoherence in these qubits are not fully understood.

Purpose of the Study:

  • To investigate the microscopic origins of decoherence in Josephson junction based phase qubits.
  • To identify specific systems or structures within the qubit that lead to performance degradation.

Main Methods:

  • Spectroscopic analysis to detect interactions between the qubit and internal systems.
  • Observation of Rabi oscillations to quantify the impact of decoherence on qubit coherence amplitude.

Main Results:

  • Identified microscopic two-level systems or resonators within the tunnel barrier of Josephson junction qubits.

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  • Spectroscopic data confirmed coupling between the qubit and these two-level systems, evidenced by level splitting.
  • Rabi oscillation coherence amplitude was significantly reduced due to the presence of these spurious microwave resonators.

    • Conclusions:

    • Microscopic two-level systems within the tunnel barrier are a dominant source of decoherence in Josephson junction qubits.
    • The discovery of these resonators has significant implications for the future development of Josephson qubits and related technologies.
    • Understanding and mitigating these decoherence sources is crucial for advancing quantum computing.