Optical control of levitated nanoparticles via dipole-dipole interaction

Area of Science:

• Quantum physics
• Optomechanics
• Nanotechnology

Background:

• Levitated nanoparticles offer a highly controllable platform for quantum experiments.
• Transporting quantum states between systems is crucial for quantum information processing.
• Nonreciprocal interactions are key to directional energy or information flow.

Purpose of the Study:

• To propose and demonstrate a scheme for unidirectional transport of mechanical quantum states between two coupled levitated nanoparticles.
• To investigate the creation and transfer of thermal squeezed states and random-phase coherent states.
• To explore the potential for creating bistability in such systems.

Main Methods:

• Utilizing a system of two interacting levitated nanoparticles.
• Parametrically driving one nanoparticle to create a thermal squeezed state.
• Inducing nonreciprocal coupling by modulating trapping laser phases and interparticle distance.
• Transporting quantum states via the engineered unidirectional channel.
• Employing feedback nonlinearity and parametric driving to induce bistability.

Main Results:

• Successfully created and unidirectionally transported thermal squeezed states and random-phase coherent states between nanoparticles.
• Demonstrated high-fidelity transfer, with the final nanoparticle exhibiting similar characteristics to the initial one.
• Achieved simultaneous bistability in the coupled system through the unidirectional mechanism.

Conclusions:

• The proposed scheme provides a robust method for unidirectional quantum state transport in levitated optomechanical systems.
• This technique opens avenues for applications in quantum sensing, metrology, quantum networks, and many-body physics.
• The ability to control and transfer quantum states with high fidelity is a significant advancement for quantum technologies.