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Dynamical decoupling and dephasing in interacting two-level systems.

Simon Gustavsson1, Fei Yan, Jonas Bylander

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|October 4, 2012
PubMed
Summary
This summary is machine-generated.

We used dynamical decoupling to extend the lifetime of entangled superconducting flux qubits. This technique reduces dephasing, enhancing qubit coherence and paving the way for fault-tolerant quantum computing.

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Area of Science:

  • Quantum computing
  • Superconducting qubits
  • Quantum information science

Background:

  • Entangled states in superconducting qubits are crucial for quantum computation.
  • Noise and dephasing limit the coherence time of these entangled states.
  • Dynamical decoupling is a promising technique for noise mitigation.

Purpose of the Study:

  • To implement dynamical decoupling techniques to enhance the lifetime of entangled states in superconducting flux qubits.
  • To investigate the effectiveness of refocusing pulses in reducing dephasing.
  • To explore the impact of multiple pulses on coupling coherence.

Main Methods:

  • Utilizing dynamical decoupling by rapidly changing the qubit's transition frequency.
  • Applying refocusing pulses to mitigate dephasing caused by frequency fluctuations.
  • Employing a 1/f noise model to analyze coupling coherence enhancement.

Main Results:

  • Successfully reduced dephasing and improved the coherence time of the entangled state.
  • Observed further enhancement of coupling coherence with multiple refocusing pulses.
  • Demonstrated agreement between experimental results and the 1/f noise model.

Conclusions:

  • Dynamical decoupling effectively mitigates noise and enhances the coherence of entangled superconducting qubits.
  • The technique is applicable to various two-qubit systems with transverse coupling.
  • These findings are vital for improving two-qubit gate fidelities and advancing fault-tolerant quantum computing.