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Fast quantum gates for neutral atoms

Jaksch1, Cirac, Zoller

  • 1Institut fur Theoretische Physik, Universitat Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.

Physical Review Letters
|September 6, 2000
PubMed
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We present fast two-qubit quantum gates for neutral atoms using Rydberg states. This method achieves gate operations significantly faster than atomic motion timescales, enabling efficient quantum computation.

Area of Science:

  • Quantum computing
  • Atomic physics
  • Quantum information science

Background:

  • Achieving fast and high-fidelity quantum gates is crucial for scalable quantum computation.
  • Neutral atoms offer a promising platform for quantum information processing due to their long coherence times and controllability.

Purpose of the Study:

  • To propose and analyze schemes for implementing a fast two-qubit quantum gate for neutral atoms.
  • To achieve gate operation times significantly shorter than the characteristic timescales of atomic motion.

Main Methods:

  • Utilizing the strong dipole-dipole interaction between neutral atoms excited to low-lying Rydberg states.
  • Employing constant electric fields to enhance the interaction energy for fast gate operations.
  • Performing a detailed analysis of potential imperfections affecting gate fidelity.

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Main Results:

  • Demonstrated feasibility of implementing fast two-qubit gates with operation times much shorter than atomic motion timescales.
  • Identified Rydberg state interactions in electric fields as a viable mechanism for achieving large interaction energies.
  • Quantified the impact of various imperfections on the gate operation.

Conclusions:

  • The proposed schemes offer a promising pathway towards building faster and more efficient quantum processors based on neutral atoms.
  • Rydberg-mediated interactions provide a powerful tool for high-speed quantum gate operations.
  • Understanding and mitigating imperfections is key to realizing high-fidelity quantum gates.