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Selective Decoupling and Hamiltonian Engineering in Dipolar Spin Networks.

A Ajoy1, U Bissbort2,3, D Poletti3

  • 1Department of Chemistry, University of California Berkeley, and Materials Science Division Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

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Summary

We developed a versatile protocol using magic angle spinning and local actuators to control interactions in spin networks. This method enables precise manipulation for quantum simulations and molecular magnet systems.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum information science

Background:

  • Controlling interactions in mesoscopic spin networks is crucial for quantum technologies.
  • Existing methods often lack precise global and local control over effective couplings.

Purpose of the Study:

  • To present a versatile protocol for selectively decoupling, recoupling, and engineering interactions in mesoscopic dipolar spin networks.
  • To enable both global and local control over effective couplings using a combination of control fields and local actuators.

Main Methods:

  • Utilizing magic angle spinning for Hamiltonian engineering.
  • Employing global control fields in conjunction with a local actuator (e.g., diamond nitrogen vacancy center).
  • Performing exact numerical simulations in few-body systems to validate the protocol.

Main Results:

  • Demonstrated a protocol for precise control over effective interactions in dipolar spin networks.
  • Showcased that the effective Hamiltonian can be understood through an intuitive geometric picture.
  • Validated the protocol's effectiveness via numerical simulations.

Conclusions:

  • The developed protocol offers versatile control over spin network interactions.
  • This method has potential applications in developing 2D room-temperature quantum simulators and in molecular magnet systems.