Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 084004 |
| Fachzeitschrift | Journal of Optics (United Kingdom) |
| Jahrgang | 18 |
| Ausgabenummer | 8 |
| Publikationsstatus | Veröffentlicht - 7 Juli 2016 |
Abstract
We revisit the problem of preparing a mechanical oscillator in the vicinity of its quantummechanical ground state by means of feedback cooling based on continuous optical detection of the oscillator position. In the parameter regime relevant to ground-state cooling, the optical backaction and imprecision noise set the bottleneck of achievable cooling and must be carefully balanced. This can be achieved by adapting the phase of the local oscillator in the homodyne detection realizing a so-called variational measurement. The trade-off between accurate position measurement and minimal disturbance can be understood in terms of Heisenbergs microscope and becomes particularly relevant when the measurement and feedback processes happen to be fast within the quantum coherence time of the system to be cooled. This corresponds to the regime of large quantum cooperativity Cq ≳ 1, which was achieved in recent experiments on feedback cooling. Our method provides a simple path to further pushing the limits of current state-of-the-art experiments in quantum optomechanics.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
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in: Journal of Optics (United Kingdom), Jahrgang 18, Nr. 8, 084004, 07.07.2016.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Quantum feedback cooling of a mechanical oscillator using variational measurements
T2 - Tweaking Heisenberg's microscope
AU - Habibi, Hojat
AU - Zeuthen, Emil
AU - Ghanaatshoar, Majid
AU - Hammerer, Klemens
N1 - Publisher Copyright: © 2016 IOP Publishing Ltd. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2016/7/7
Y1 - 2016/7/7
N2 - We revisit the problem of preparing a mechanical oscillator in the vicinity of its quantummechanical ground state by means of feedback cooling based on continuous optical detection of the oscillator position. In the parameter regime relevant to ground-state cooling, the optical backaction and imprecision noise set the bottleneck of achievable cooling and must be carefully balanced. This can be achieved by adapting the phase of the local oscillator in the homodyne detection realizing a so-called variational measurement. The trade-off between accurate position measurement and minimal disturbance can be understood in terms of Heisenbergs microscope and becomes particularly relevant when the measurement and feedback processes happen to be fast within the quantum coherence time of the system to be cooled. This corresponds to the regime of large quantum cooperativity Cq ≳ 1, which was achieved in recent experiments on feedback cooling. Our method provides a simple path to further pushing the limits of current state-of-the-art experiments in quantum optomechanics.
AB - We revisit the problem of preparing a mechanical oscillator in the vicinity of its quantummechanical ground state by means of feedback cooling based on continuous optical detection of the oscillator position. In the parameter regime relevant to ground-state cooling, the optical backaction and imprecision noise set the bottleneck of achievable cooling and must be carefully balanced. This can be achieved by adapting the phase of the local oscillator in the homodyne detection realizing a so-called variational measurement. The trade-off between accurate position measurement and minimal disturbance can be understood in terms of Heisenbergs microscope and becomes particularly relevant when the measurement and feedback processes happen to be fast within the quantum coherence time of the system to be cooled. This corresponds to the regime of large quantum cooperativity Cq ≳ 1, which was achieved in recent experiments on feedback cooling. Our method provides a simple path to further pushing the limits of current state-of-the-art experiments in quantum optomechanics.
KW - feedback cooling
KW - Heisenberg's microscope
KW - quantum optomechanics
KW - variational measurements
UR - http://www.scopus.com/inward/record.url?scp=84980368122&partnerID=8YFLogxK
U2 - 10.1088/2040-8978/18/8/084004
DO - 10.1088/2040-8978/18/8/084004
M3 - Article
AN - SCOPUS:84980368122
VL - 18
JO - Journal of Optics (United Kingdom)
JF - Journal of Optics (United Kingdom)
SN - 2040-8978
IS - 8
M1 - 084004
ER -