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Correcting low-frequency noise with continuous measurement.

L Tian1

  • 1National Institute of Standards and Technology, 100 Bureau Drive, Stop 8423, Gaithersburg, Maryland 20878, USA.

Physical Review Letters
|May 16, 2007
PubMed
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Low-frequency noise causes qubit decoherence. This study reveals a method to calibrate this noise using qubit relaxation, enabling high-fidelity quantum logic gates.

Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Quantum Information Science

Background:

  • Low-frequency noise is a major challenge causing decoherence in solid-state qubits.
  • This noise can lead to unwanted relaxation between qubit states, especially under continuous measurement.

Purpose of the Study:

  • To introduce a novel method for calibrating low-frequency noise in solid-state qubits.
  • To demonstrate how qubit relaxation can be utilized for noise characterization and mitigation.

Main Methods:

  • Utilizing continuous weak measurement of qubit eigenstates.
  • Inducing and observing second-order relaxation dynamics caused by low-frequency noise.
  • Encoding a single qubit using two physical qubits for alternative calibration.

Related Experiment Videos

Main Results:

  • Demonstrated that qubit relaxation provides a unique time-domain approach to calibrate low-frequency noise.
  • Achieved high-fidelity quantum-logic gates through the proposed calibration technique.

Conclusions:

  • The developed method offers a practical way to characterize and potentially mitigate low-frequency noise in solid-state quantum systems.
  • This approach enhances the performance and reliability of quantum computations by improving qubit coherence and gate fidelity.