Proposal for a quantum traveling Brillouin resonator

Area of Science:

• Quantum physics
• Optomechanics
• Materials science

Background:

• Brillouin systems are crucial for quantum information technologies and fundamental science.
• Achieving the quantum regime in Brillouin systems is challenging due to strict requirements for low dissipation and strong interactions.

Purpose of the Study:

• To propose and theoretically analyze a novel on-chip liquid-based Brillouin system.
• To achieve strong phonon-photon coupling with low acoustic dissipation for quantum applications.

Main Methods:

• Utilizing a silicon-based "slot" waveguide filled with superfluid helium.
• Designing an on-chip traveling wave Brillouin resonator supporting optical and acoustical traveling waves.
• Confining optical and acoustic fields into a subwavelength-scale mode volume.

Main Results:

• Predicted large phonon-photon coupling with exceptionally low acoustic dissipation.
• Achieved an electrostrictive single photon optomechanical coupling rate exceeding 240 kHz.
• Demonstrated a platform for exploring quantum fluid dynamics in strongly interacting condensates.

Conclusions:

• The proposed system offers a promising platform for advancing quantum information technologies.
• Potential applications include ultra-sensitive superfluid-based gyroscopes and non-reciprocal optical circuits.
• This work opens new avenues for fundamental research in quantum fluid dynamics.