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Related Experiment Videos

Quantum computation with trapped ions in an optical cavity.

Jiannis Pachos1, Herbert Walther

  • 1Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany. jip@mpq.mpg.de

Physical Review Letters
|October 26, 2002
PubMed
Summary

High-fidelity two-qubit gates are proposed using trapped atoms in a cavity. Adiabatic transitions and the quantum Zeno effect suppress losses, enabling robust quantum computation with near-unity success rates.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Implementing robust quantum gates is crucial for scalable quantum computation.
  • Atom-cavity systems offer a promising platform for quantum information processing.
  • Minimizing gate infidelity caused by spontaneous emission is a key challenge.

Purpose of the Study:

  • To propose a novel scheme for implementing two-qubit logical gates using trapped atoms in a cavity.
  • To suppress losses from spontaneous transitions using adiabatic passage and the quantum Zeno effect.
  • To achieve high-fidelity and high-success-rate quantum gates for quantum computation.

Main Methods:

  • Utilizing a two-atom cavity system addressed by laser fields.
  • Employing adiabatic transitions to minimize spontaneous emission.
  • Leveraging the quantum Zeno effect for enhanced gate fidelity.
  • Proposing both dynamical and geometrical conditional phase gates.

Main Results:

  • Demonstrated efficient suppression of losses due to spontaneous transitions.
  • Achieved gate fidelities and success rates very close to unity.
  • Proposed schemes for both dynamical and geometrical conditional phase gates.

Conclusions:

  • The proposed method offers a highly effective approach for creating robust two-qubit gates.
  • The high fidelity and success rate make this scheme suitable for practical quantum computation.
  • Atom-cavity systems combined with adiabatic techniques provide a viable path towards scalable quantum computing.

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