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Two-qubit atomic gates: spatio-temporal control of Rydberg interaction.

Ignacio R Sola1, Vladimir S Malinovsky2, Jaewook Ahn3

  • 1Departamento de Quimica Fisica I, Universidad Complutense, 28040 Madrid, Spain.

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Summary
This summary is machine-generated.

We present a new protocol for creating two-qubit entangling gates on atoms using controlled light pulses. This method enhances gate speed to the nanosecond scale and offers robustness against experimental variations.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Two-qubit entangling gates are fundamental for quantum computation.
  • Previous protocols faced limitations in speed and robustness.

Purpose of the Study:

  • To develop a novel, faster, and more robust protocol for preparing two-qubit entangling gates.
  • To explore the use of controlled temporal and spatial light features for quantum operations.

Main Methods:

  • Utilizing a dark state to coherently drive population through Rydberg states.
  • Employing structured light with controlled temporal and spatial characteristics.
  • Generalizing existing time-domain protocols with symmetric three-pulse sequences and varying pulse areas.

Main Results:

  • Achieving gate operation speeds on the nanosecond scale, a significant improvement over sub-microsecond scales.
  • Demonstrating robustness against variations in pulse areas and atomic positions.
  • Analyzing gate fidelity maps revealing distorted lattice structures in the solution space.

Conclusions:

  • The proposed protocol offers a significant advancement in the speed and reliability of two-qubit entangling gates.
  • The use of dark states and structured light provides a robust pathway for scalable quantum information processing.
  • Further generalizations for multi-qubit systems and multi-pulse sequences are proposed.