Design of silicon micro-resonators with low mechanical and optical losses for quantum optics experiments

Borrielli, A.; Bonaldi, M.; Serra, Enrico; Bagolini, Alvise; Bellutti, P.; Cataliotti, F. S.; Marín, F.; Marino, Francesco; Pontin, A.; Prodi, G. A.; Pandraud, G.; Sarro, P.M.; Lorito, G.; Zoumpoulidis, T.

doi:10.1007/s00542-014-2078-y

Cited by 9 publications

(7 citation statements)

References 42 publications

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“…For the measurements at intermediate mass we have used a silicon wheel oscillator, made on the 70-μm thick device layer of an Silicon-On-Insulator wafer and composed of a central disk kept by structured beams 27 , balanced by four counterweights on the beams joints that so become nodal points ( Fig. 1b ) 28 . On the surface of the central disk, a multilayer SiO 2 /Ta 2 O 5 dielectric coating forms an high reflectivity mirror.…”

Section: Resultsmentioning

confidence: 99%

Probing deformed commutators with macroscopic harmonic oscillators

et al. 2015

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A minimal observable length is a common feature of theories that aim to merge quantum physics and gravity. Quantum mechanically, this concept is associated with a nonzero minimal uncertainty in position measurements, which is encoded in deformed commutation relations. In spite of increasing theoretical interest, the subject suffers from the complete lack of dedicated experiments and bounds to the deformation parameters have just been extrapolated from indirect measurements. As recently proposed, low-energy mechanical oscillators could allow to reveal the effect of a modified commutator. Here we analyze the free evolution of high-quality factor micro- and nano-oscillators, spanning a wide range of masses around the Planck mass mP (≈22 μg). The direct check against a model of deformed dynamics substantially lowers the previous limits on the parameters quantifying the commutator deformation.

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Section: Resultsmentioning

confidence: 99%

Probing deformed commutators with macroscopic harmonic oscillators

et al. 2015

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“…Our silicon oscillator is made on the 70 µm thick device layer of a SOI wafer [26] and is composed of a central mass kept by structured beams [27], balanced by four counterweights on the beams joints [28]. On the surface of the central disk, a multilayer SiO 2 /Ta 2 O 5 dielectric coating forms a high reflectivity mirror.…”

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confidence: 99%

Dynamical Two-Mode Squeezing of Thermal Fluctuations in a Cavity Optomechanical System

et al. 2016

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We report the experimental observation of two-mode squeezing in the oscillation quadratures of a thermal micro-oscillator. This effect is obtained by parametric modulation of the optical spring in a cavity opto-mechanical system. In addition to stationary variance measurements, we describe the dynamic behavior in the regime of pulsed parametric excitation, showing enhanced squeezing effect surpassing the stationary 3dB limit. While the present experiment is in the classical regime, our technique can be exploited to produce entangled, macroscopic quantum opto-mechanical modes.

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“…The drum modes have eigenfrequencies starting from ∼200 kHz and masses of the order of 10 −10 kg. The silicon frame is suspended with alternating flexural and torsional springs, forming an on-chip "loss shield" structure [50] that allows to achieve a mechanical quality factor Q around 10 7 for most of the drum modes. More information about the design, fabrication and the characteristics of the device can be found in the works by Borrielli et al [51] and Serra et al [52,53].…”

Section: Status Of the Experimentsmentioning

confidence: 99%

Probing quantum gravity effects with quantum mechanical oscillators

et al. 2020

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Phenomenological models aiming to join gravity and quantum mechanics often predict effects that are potentially measurable in refined low-energy experiments. For instance, modified commutation relations between position and momentum, that account for a minimal scale length, yield a dynamics that can be codified in additional Hamiltonian terms. When applied to the paradigmatic case of a mechanical oscillator, such terms, at the lowest order in the deformation parameter, introduce a weak intrinsic nonlinearity and, consequently, deviations from the classical trajectory. This point of view has stimulated several experimental proposals and realizations, leading to meaningful upper limits to the deformation parameter. All such experiments are based on classical mechanical oscillators, i.e., excited from a thermal state. We remark indeed that decoherence, that plays a major role in distinguishing the classical from the quantum behavior of (macroscopic) systems, is not usually included in phenomenological quantum gravity models. However, it would not be surprising if peculiar features that are predicted by considering the joined roles of gravity and quantum physics should manifest themselves just on purely quantum objects. On the basis of this consideration, we propose experiments aiming to observe possible quantum gravity effects on macroscopic mechanical oscillators that are preliminary prepared in a high purity state, and we report on the status of their realization.

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Design of silicon micro-resonators with low mechanical and optical losses for quantum optics experiments

Cited by 9 publications

References 42 publications

Probing deformed commutators with macroscopic harmonic oscillators

Probing deformed commutators with macroscopic harmonic oscillators

Dynamical Two-Mode Squeezing of Thermal Fluctuations in a Cavity Optomechanical System

Probing quantum gravity effects with quantum mechanical oscillators

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