Pulsed optomechanical measurements enable squeezing, non-classical state creation and backaction-free sensing. We demonstrate pulsed measurement of a cryogenic nanomechanical resonator with record precision close to the quantum regime. We use these to prepare thermally squeezed and purified conditional mechanical states, and to perform full state tomography. These demonstrations exploit large photon-phonon coupling in a nanophotonic cavity to reach a single-pulse imprecision of 9 times the mechanical zero-point amplitude xzpf. We study the effect of other mechanical modes which limit the conditional state width to 58 xzpf, and show how decoherence causes the state to grow in time.
@article{arxiv.1812.09720,
title = {State preparation and tomography of a nanomechanical resonator with fast light pulses},
author = {Juha T. Muhonen and Giada R. La Gala and Rick Leijssen and Ewold Verhagen},
journal= {arXiv preprint arXiv:1812.09720},
year = {2019}
}