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Related Experiment Videos

Coherence stabilization of a two-qubit gate by ac fields.

Karen M Fonseca-Romero1, Sigmund Kohler, Peter Hänggi

  • 1Institut für Physik, Universität Augsburg, Universitätsstrasse 1, D-86135 Augsburg, Germany.

Physical Review Letters
|October 26, 2005
PubMed
Summary

Applying AC fields to CNOT gates suppresses quantum bit-flip noise by transforming it into phase noise. This significantly enhances qubit coherence without altering gate operation time, improving quantum computing reliability.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Error Correction

Background:

  • Quantum gates like CNOT are susceptible to bit-flip noise, degrading performance.
  • Controlling qubit-Hamiltonian interactions is crucial for mitigating noise.

Purpose of the Study:

  • To investigate the effect of AC fields on CNOT gate operations under bit-flip noise.
  • To demonstrate a method for transforming bit-flip noise into phase noise for improved coherence.

Main Methods:

  • Analytical study using a high-frequency approximation for qubit Hamiltonian.
  • Numerical simulations employing a Bloch-Redfield master equation.

Main Results:

  • AC fields modify the qubit Hamiltonian to commute with the bath coupling, effectively changing bit-flip noise to phase noise.

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  • Achieved several orders of magnitude improvement in coherence while maintaining gate operation time.
  • Analytical predictions for purity and fidelity were confirmed by numerical results.

    • Conclusions:

    • AC field application is a viable strategy for robust CNOT gate operations.
    • This method offers significant enhancement in quantum coherence and gate fidelity.
    • The findings contribute to developing more stable quantum computing architectures.