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Clock transition by continuous dynamical decoupling of a three-level system.

Alexander Stark1,2, Nati Aharon3, Alexander Huck4

  • 1Center for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark. astark@fysik.dtu.dk.

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This summary is machine-generated.

We developed a new continuous dynamical decoupling method to create a robust qubit in three-level systems. This technique significantly enhances coherence time by minimizing environmental and drive noise, bringing qubits closer to their theoretical lifetime limits.

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Area of Science:

  • Quantum computing
  • Atomic, molecular, and optical physics

Background:

  • Qubit coherence is limited by environmental and drive noise.
  • Three-level systems offer potential for robust qubit implementation.

Purpose of the Study:

  • To present a novel continuous dynamical decoupling scheme for robust qubit construction.
  • To achieve noise suppression and enhance coherence times in three-level systems.

Main Methods:

  • Utilizing a clock transition adjustment in a three-level system.
  • Applying continuous dynamical decoupling with moderate Rabi frequencies.
  • Demonstrating the scheme with Nitrogen-Vacancy (NV) center electronic ground state spin sub-levels.

Main Results:

  • Achieved first-order robustness to environmental noise and eliminated drive-noise.
  • Obtained a 2-orders-of-magnitude improvement in coherence time compared to pure dephasing time.
  • Demonstrated potential for further coherence time enhancement by tuning the clock transition to eliminate second-order environmental noise effects.

Conclusions:

  • The proposed scheme significantly prolongs qubit coherence times.
  • The method offers a pathway towards achieving lifetime-limited coherence using a simple experimental setup.