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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Phase-modulated decoupling and error suppression in qubit-oscillator systems.

Todd J Green1, Michael J Biercuk1

  • 1ARC Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, New South Wales 2006 Australia.

Physical Review Letters
|April 11, 2015
PubMed
Summary
This summary is machine-generated.

We developed a new quantum gate method to reduce errors in entangling operations. This technique suppresses unwanted qubit-oscillator entanglement, improving gate fidelity for quantum computing applications.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Atomic Physics

Background:

  • Entangling gates are crucial for quantum computation.
  • Infidelity in these gates often arises from residual qubit-oscillator entanglement.
  • This entanglement reduces the overall fidelity of quantum operations.

Purpose of the Study:

  • To present a novel scheme for suppressing infidelity in entangling gates.
  • To address the issue of residual qubit-oscillator entanglement.
  • To enhance the fidelity of quantum operations in coupled quantum systems.

Main Methods:

  • Utilizing discrete shifts in the phase of the moderating field.
  • Ensuring decoupling of multiple oscillator modes.
  • Suppressing effects of fluctuations in the driving field.

Main Results:

  • Demonstrated a scheme to suppress dominant sources of infidelity in entangling gates.
  • Showcased the exclusive use of discrete phase shifts for decoupling and suppression.
  • Validated the approach's applicability to superconducting qubits and trapped ions.

Conclusions:

  • The proposed phase-shifting scheme effectively suppresses infidelity in entangling gates.
  • This method is compatible with various quantum computing architectures.
  • Potential for reduced technical complexity in multiqubit gate implementation.