Selective Decoupling and Hamiltonian Engineering in Dipolar Spin Networks

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.