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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Soft Quantum Control for Highly Selective Interactions among Joint Quantum Systems.

J F Haase1, Z-Y Wang1, J Casanova1

  • 1Institut für Theoretische Physik und IQST, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm, Germany.

Physical Review Letters
|August 18, 2018
PubMed
Summary
This summary is machine-generated.

We developed a quantum control method using temporal modulation to achieve highly selective interactions between quantum system components. This technique enhances precision in quantum sensing and entanglement, even with similar frequencies.

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Area of Science:

  • Quantum Control
  • Quantum Information Science
  • Atomic, Molecular, and Optical Physics

Background:

  • Achieving selective interactions in complex quantum systems is crucial for advanced applications.
  • Off-resonant interactions often limit the precision and fidelity of quantum operations.
  • Controlling interaction strength dynamically is a key challenge in quantum engineering.

Purpose of the Study:

  • To propose a novel quantum control scheme for highly selective coupling in interacting systems.
  • To demonstrate the suppression of off-resonant contributions through temporal modulation of interaction strength.
  • To showcase applications in quantum sensing, entanglement, and probing weak couplings.

Main Methods:

  • Implementing a protocol with adiabatic temporal control of interaction strength, switching it on and off.
  • Applying the scheme to nitrogen-vacancy centers in diamond for experimental validation.
  • Developing theoretical framework for selective quantum control in near-resonant systems.

Main Results:

  • Demonstrated efficient rotating-wave approximation across a broad parameter range.
  • Showcased elimination of unwanted side peaks in quantum sensing.
  • Achieved selective high-fidelity entanglement gates on nuclear spins with close frequencies.
  • Successfully applied to detect weak electron-nuclear coupling in nitrogen-vacancy centers despite strong perturbations.

Conclusions:

  • The proposed quantum control scheme offers a powerful tool for enhancing selectivity in interacting quantum systems.
  • Adiabatic temporal modulation effectively suppresses off-resonant effects, improving fidelity in various quantum applications.
  • The method provides a pathway for precise control and measurement in challenging quantum environments, such as solid-state qubits.