Rotational Optomechanics

James Millen
September 14th, 2018 JAMES MILLEN King’s College London

Optomechanical systems may well be key devices in quantum technology, by storing and transducing quantum signals, and generating entanglement between optical and mechanical modes. By levitating the mechanical element, dissipation is drastically reduced, promising long-lived quantum states, high-fidelity signal processing, and even the potential to test the limits of quantum physics.

By working with levitated objects it is possible to access rotational degrees of freedom, which is impossible in a clamped system. Rotation is fundamentally different to vibration, both in the classical and quantum domains. We have optically trapped, driven and frequency-locked the rotation of nanoscale levitated cylinders. We predict it will be possible to cool the motion of these nano-objects to the quantum ground state using high-performance optical micro-cavities, and even at modest temperatures we predict the observation of orientational quantum revivals.

Rotational optomechanics promises unparalleled, potentially quantum-enhanced rotation and torque sensitivity with micrometre spatial resolution in a compact package, that could even be circuit integrated, as well as the potential to look for quantum signatures in the motion of mesoscopic objects.

Seminar, September 14, 2018, 12:00. ICFO’s Seminar Room

Hosted by Prof. Romain Quidant