Coherent feedback cooling of a nanomechanical membrane with atomic spins

Coherent feedback stabilises a system towards a target state without the need of a measurement, thus avoiding the quantum backaction inherent to measurements. Here, we employ optical coherent feedback to remotely cool a nanomechanical membrane using atomic spins as a controller. Direct manipulation...

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Bibliographic Details
Published in:arXiv.org 2022-03
Main Authors: Schmid, Gian-Luca, Ngai, Chun Tat, Ernzer, Maryse, Manel Bosch Aguilera, Karg, Thomas M, Treutlein, Philipp
Format: Article
Language:English
Subjects:
Coherence
Cooling
Feedback
Mechanical oscillators
Membranes
Quantum mechanics
Room temperature
Online Access:Get full text
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Summary:Coherent feedback stabilises a system towards a target state without the need of a measurement, thus avoiding the quantum backaction inherent to measurements. Here, we employ optical coherent feedback to remotely cool a nanomechanical membrane using atomic spins as a controller. Direct manipulation of the atoms allows us to tune from strong-coupling to an overdamped regime. Making use of the full coherent control offered by our system, we perform spin-membrane state swaps combined with stroboscopic spin pumping to cool the membrane in a room-temperature environment to \({T}={216}\,\mathrm{mK}\) (\(\bar{n}_{m} = 2.3\times 10^3\) phonons) in \({200}\,\mathrm{{\mu}s}\). We furthermore observe and study the effects of delayed feedback on the cooling performance. Starting from a cryogenically pre-cooled membrane, this method would enable cooling of the mechanical oscillator close to its quantum mechanical ground state and the preparation of nonclassical states.
ISSN:2331-8422
DOI:10.48550/arxiv.2111.09802