Quantum control of nanomechanical oscillators

by Dr. Itay Shomroni

Laboratoire De Photonique Et De Mesure Quantique, Lausanne, Switzerland

at Quantum optics seminar

Wed, 11 Dec 2019, 15:00
Sacta-Rashi Building for Physics (54), room 207

Abstract

Within the emerging field of Quantum Optomechanics, it has become possible in
recent years to establish a quantum interface between light and the motion of an
engineered mechanical oscillator, and to observe such effects as motional
sideband asymmetry, radiation pressure shot noise, and ponderomotive squeezing.
These achievements are now being extended towards applications and fundamental
research. The possibility to manipulate motion at the quantum level opens new
avenues such as sensing technologies with unprecedented sensitivities, encoding
quantum information in ultrahigh-quality nanomechanical systems, and engineering
macroscopic quantum states for testing of fundamental quantum physics. I will
describe my recent work with optomechanical photonic crystals, demonstrating
quantum measurement techniques that evade quantum backaction noise [1,2] and laser
cooling of macrosopic mechanical motion down to a record level of 92% ground state
occupation [4]. I will show how to extend these results with related methods that
generate mechanical squeezed states, to realize sensing of force and displacement
beyond the standard quantum limit. In addition I will describe my recent theoretical
proposal for generating superposition (cat) states in a macroscopic oscillator [5], that
directly builds upon these techniques.
Refs:
[1] Shomroni et al., Phys. Rev. X 9, 041022 (2019)
[2] Shomroni et al., Nat. Commun. 10, 2086 (2019)
[3] Qiu*, Shomroni* et al., Phys. Rev. A 100, 053852 (2019)
[4] Qiu*, Shomroni* et al., arXiv:1903.10242
[5] Shomroni et al., arXiv:1909.10624

Created on 08-12-2019 by Folman, Ron (folman)
Updaded on 08-12-2019 by Folman, Ron (folman)