סמינר מחלקתי אלקטרוניקה פיזיקאלית : Itay Shomroni

You are invited to attend a lecture

Quantum control with nanomechanical oscillators

:By

Itay Shomroni

Laboratoire de Photonique et de Mesure Quantique

Abstract

Quantum optomechanics, the study of mechanical motion in the quantum regime

using light, is an emerging field with applications ranging from sensing to

quantum information to exploring the classical-to-quantum transition. Although

its foundations had been laid in the 60s and 70s, quantum effects in macroscopic

mechanical motion, such as motional sideband asymmetry, radiation pressure shot

noise, and ponderomotive squeezing, have been observed only in the recent decade,

with advances in high-finesse microcavities. Mechanical oscillators based on

photonic crystals are one of the most promising systems for probing and

manipulating quantum motion, allowing efficient cooling to the motional ground

state using light as well as quantum-coherent operations. I will describe my

recent research with these systems, which includes the first demonstration of

backaction-evading measurement of mechanical motion in the optical domain. Such

measurement, originally proposed in the context of gravitational wave detection,

allows in principle arbitrary sensitivity by measuring only a single quadrature

of the motion, beating the quantum limit imposed by Heisenberg's uncertainty

relation. In addition, entering the regime of strongly-probed mechanical systems

close to their ground state has revealed novel phenomena such as interplay of

optomechanics and other Kerr-type effects, and new dynamics that can lead to

extraordinary instabilities. Quantum optomechanics is now entering a new era where full quantum control is feasible, and I will give my outlook and possible future

directions.

On Thursday, Nov 15, 2018, 15:00

Room 011, Kitot building