First Cooling Below 0.1 K of the New Gravitational-Wave Antenna “Nautilus” of the Rome Group

Astone, P.; Bassan, M.; Bonifazi, P.; Bronzini, F.; Castellano, M. G.; Coccia, E.; Cosmelli, C.; Fafone, V.; Frasca, S.; Majorana, E.; Modena, I.; Pallottino, G. V.; Pizzella, G.; Rapagnani, P.; Ricci, F.; Visco, M.

doi:10.1209/0295-5075/16/3/002

Cited by 70 publications

(29 citation statements)

References 5 publications

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“…On a much larger scale, mechanical resonators are fundamental to many gravitational wave detectors. Bar resonator detectors, from the original Weber bars [59] to the more-recent Nautilus [6] and AURIGA [67] projects, detect displacements of a 1000-kg-scale "antenna" for gravitational waves. Interferometric detectors like GEO [63], LIGO [2], and VIRGO [3] essentially measure the position of the 10-kg-scale mirrors at the ends of their interferometer arms.…”

Section: Introductionmentioning

confidence: 99%

Quantum squeezing of motion in a mechanical resonator

Wollman

Lei

Weinstein

et al. 2015

Science

668

566

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showed patience and understanding. He gave me the opportunity to work on a variety of interesting projects, from graphene, to superconducting amplifiers, to the results discussed here. Most of all, Keith taught me to be more decisive, to take more risks, and to do whatever it takes. Our theory collaborators on the squeezing project, Aashish Clerk, Florian Marquardt, and especially Andreas Kronwald, gave essential support before, during, and after measurement-taking.Although they sometimes seemed puzzled at the number of ways that things can go wrong in experimental work, they showed great patience as we tried to make their proposal a reality.I couldn't have made it through grad school without the support of my friends: Paul, Branimir, Helge, Alice, Tristan, Chris, Kris, Doron, Mo, and Carly. They gave me something to look forward to throughout the week, and something to talk about other than grad school. where an optical or microwave cavity is coupled to the mechanics in order to control and read out the mechanical state. In the proposal, two pump tones are applied to the cavity, each detuned from the cavity resonance by the mechanical frequency. The pump tones establish and couple the mechanics to a squeezed reservoir, producing arbitrarily-large, steady-state squeezing of the mechanical motion.In this dissertation, I describe two experiments related to the implementation of this proposal in an electromechanical system. I also expand on the theory presented in [30] to include the effects of squeezing in the presence of classical microwave noise, and without assumptions of perfect alignment of the pump frequencies.In the first experiment, we produce a squeezed thermal state using the method of Kronwald et. al..We perform back-action evading measurements of the mechanical squeezed state in order to probe the noise in both quadratures of the mechanics. Using this method, we detect single-quadrature fluctuations at the level of 1.09 ± 0.06 times the quantum zero-point motion.In the second experiment, we measure the spectral noise of the microwave cavity in the presence of the squeezing tones and fit a full model to the spectrum in order to deduce a quadrature variance of 0.80 ± 0.03 times the zero-point level. These measurements provide the first evidence of quantum squeezing of motion in a mechanical resonator.

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Section: Introductionmentioning

confidence: 99%

Quantum squeezing of motion in a mechanical resonator

Wollman

Lei

Weinstein

et al. 2015

Science

668

566

View full text Add to dashboard Cite

show abstract

“…发展方向主要集中在采用更好的隔震系统、品质因子更高的材料 [24] 、更低的运行温度 [25] 、损耗更低的信号转换放大系统 [26] 等几个方面. 以西澳大利亚大学的探测器NIOBE [27] 为例, 如图2所示 [28] , 它使用…”

Section: 共振棒探测器在接下来的数十年里被不断地改进升级 20世纪90年代是共振棒探测器发展的黄金时unclassified

GW150914 and gravitational-wave astronomy

Liu¹,

Wang²,

Hu³

et al. 2016

Chin. Sci. Bull.

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“…³ÂÏÂâ ÐËÊÍÑÕÇÏÒÇÓÂÕÖÓÐÂâ ÓÇÊÑÐÂÐÔÐÂâ ÂÐÕÇÐÐÂ Nautilus ÃÞÎÂ ÔÑÊAEÂÐÂ Ä ªÕÂÎËË, Ä ²ËÏÇ (Instituto Nazionale di Fisica Nucleare ë Laboratori Nazionali di Frascati) [23,44,45 ³ÒËÔÑÍ ÎËÕÇÓÂÕÖÓÞ…”

Section: ²ëô 3 ²çêñðâðôðþì Aeçõçíõñó Explorer (¸¦²¯ ºäçìùâóëâ)unclassified

On the direct detection of gravitational waves

Pustovoit¹

2016

Успехи физических наук

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First Cooling Below 0.1 K of the New Gravitational-Wave Antenna “Nautilus” of the Rome Group

Abstract: PACS. 04.80 -Experimental tests of general relativity and observations of gravitational radiation.

Cited by 70 publications

References 5 publications

Quantum squeezing of motion in a mechanical resonator

Quantum squeezing of motion in a mechanical resonator

GW150914 and gravitational-wave astronomy

On the direct detection of gravitational waves

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