English

# Item

ITEM ACTIONSEXPORT
Quantum Feedback Cooling of a Mechanical Oscillator Using Variational Measurements:Tweaking Heisenberg's Microscope

Habibi, H., Zeuthen, E., Ghanaatshoar, M., & Hammerer, K. (2016). Quantum Feedback Cooling of a Mechanical Oscillator Using Variational Measurements:Tweaking Heisenberg's Microscope. Journal of Optics, 18(8): 084004. doi:10.1088/2040-8978/18/8/084004.

Item is

### Basic

show hide
Genre: Journal Article

### Files

show Files
hide Files
:
1604.05097.pdf (Preprint), 5MB
Name:
1604.05097.pdf
Description:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
-
-
:
J._Opt._18_084004.pdf (Any fulltext), 612KB

-
Name:
J._Opt._18_084004.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
-
-
-

show

### Creators

show
hide
Creators:
Habibi, Hojat1, Author
Zeuthen, Emil1, Author
Ghanaatshoar, Majid, Author
Hammerer, Klemens1, Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010

### Content

show
hide
Free keywords: Quantum Physics, quant-ph, Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall
Abstract: We revisit the problem of preparing a mechanical oscillator in the vicinity of its quantum-mechanical 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 back-action 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 Heisenberg's 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 $C_{\text{q}}\gtrsim1$, 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.

### Details

show
hide
Language(s):
Dates: 2016-04-182016-06-032016
Publication Status: Published in print
Pages: Article submitted to the special issue on Nano-optomechanics edited by I. Wilson-Rae and J. Sanckey in Journal of Optics
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1604.05097
DOI: 10.1088/2040-8978/18/8/084004
URI: http://arxiv.org/abs/1604.05097
Degree: -

show

show

show

### Source 1

show
hide
Title: Journal of Optics
Source Genre: Journal
Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 18 (8) Sequence Number: 084004 Start / End Page: - Identifier: -