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CAMP Seminar: Probing the Limits of Quantum Mechanics
Add to Calendar 2020-02-17T20:30:00 2020-02-17T21:30:00 UTC CAMP Seminar: Probing the Limits of Quantum Mechanics

Physics CAMP Seminar

Davey Lab (339)
Start DateMon, Feb 17, 2020
3:30 PM
to
End DateMon, Feb 17, 2020
4:30 PM
Presented By
Itay Shomroni, EPFL

Physics CAMP Seminar

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
enable sensing of force and displacement beyond the standard quantum limit. I will
also report on 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 to generate mechanical squeezed states. Finally, 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 (accepted to PRA)