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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

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Spin-Controlled Quantum Interference of Levitated Nanorotors.

Cosimo C Rusconi^1,2, Maxime Perdriat³, Gabriel Hétet³

¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.

Physical Review Letters

|September 9, 2022

Summary

Researchers demonstrate controlling a nanodiamond's orientation using a nitrogen-vacancy (NV) center. This quantum control method enables superpositions of particle orientation, paving the way for advanced quantum technologies.

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Area of Science:

Quantum physics
Nanotechnology
Optics

Background:

Nitrogen-vacancy (NV) centers in diamond are promising quantum bits.
Controlling the orientation of nanoscale objects is crucial for quantum sensing and manipulation.
Achieving quantum control over macroscopic degrees of freedom remains a challenge.

Purpose of the Study:

To develop a method for preparing a nanodiamond in a superposition of orientations.
To achieve single-spin control over a particle's 3D orientation.
To explore the feasibility of quantum control for nanoscale rotators.

Main Methods:

Utilizing microwave driving of a single nitrogen-vacancy (NV) center in an electrically levitated nanodiamond.
Aligning a magnetic field with the NV center to achieve ultrastrong coupling with diamond rotation.
Deriving an effective spin-oscillator Hamiltonian for rotational dynamics.
Developing a protocol to create and observe quantum superpositions of orientation.

Main Results:

Demonstrated preparation of a nanodiamond in a quantum superposition of orientations.
Achieved single-spin control over the 3D orientation of the nanodiamond.
Derived the theoretical framework for spin-rotational coupling and quantum state preparation.

Conclusions:

The proposed method allows for quantum control of a nanodiamond's orientation.
The technique is robust against decoherence and implementable with near-future technology.
This work opens new avenues for quantum manipulation of mechanical objects.