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Related Experiment Videos

Charge echo in a cooper-pair box.

Y Nakamura1, Yu A Pashkin, T Yamamoto

  • 1NEC Fundamental Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan.

Physical Review Letters
|January 22, 2002
PubMed
Summary
This summary is machine-generated.

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Researchers used a spin-echo technique on a superconducting electrode to study charge noise. Low-frequency 1/f charge noise was found to be the primary cause of dephasing in this artificial two-level system.

Area of Science:

  • Quantum computing
  • Superconducting circuits
  • Condensed matter physics

Background:

  • Artificial two-level systems are crucial for quantum technologies.
  • Superconducting electrodes offer a platform for studying quantum phenomena.
  • Charge noise can limit the coherence of quantum systems.

Purpose of the Study:

  • To investigate the dephasing mechanisms in a superconducting artificial two-level system.
  • To apply a spin-echo technique for precise measurement of decoherence.
  • To identify the dominant noise source affecting the system's coherence time.

Main Methods:

  • Utilized a spin-echo-type technique on a superconducting electrode.
  • Employed gate-voltage pulses to generate a specific pulse sequence.

Related Experiment Videos

  • Eliminated inhomogeneity effects in time-ensemble measurements to obtain refocused echo signals.

    • Main Results:

    • Successfully obtained refocused echo signals from the artificial two-level system.
    • Observed a decay time for the echo signal.
    • Compared the decay time with the estimated decoherence time, revealing a discrepancy.

    Conclusions:

    • Low-frequency energy-level fluctuations, attributed to 1/f charge noise, are the dominant source of dephasing.
    • The spin-echo technique effectively probes decoherence in superconducting qubits.
    • Understanding and mitigating 1/f charge noise is critical for advancing superconducting quantum systems.