Observation of Rayleigh Phonon Scattering through Excitation of Extremely High Overtones in Low-Loss Cryogenic Acoustic Cavities for Hybrid Quantum Systems

Goryachev, Maxim; Creedon, Daniel L.; Galliou, Serge; Tobar, Michael E.

doi:10.1103/physrevlett.111.085502

Cited by 62 publications

(105 citation statements)

References 23 publications

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“…3, are larger than those of sample 6801, Fig. 4) [5]. Beyond the overall trend of losses for a given configuration, which is outside the scope of this paper, most of the loss values clearly change in the same proportion from one configuration to the other, depending on the nature of the coating.…”

Section: Results With Metal Coatingsmentioning

confidence: 69%

“…With the recent development in cryogenic quartz technology with its exceptional quality factors [4,5], new application areas have emerged [6]. In particular, BAW acoustic devices are proposed as a platform to probe the Lorentz Invariance in the matter sector [7], high frequency gravity wave detection [8], links between gravity and quantum mechanics [9], quantum information manipulation [10], and it might be sensitive to particular types of dark matter [11].…”

Section: Introductionmentioning

confidence: 99%

“…The same assumption is made in the present work where due to extremely low losses of the crystal substrate, a high-quality quartz trapped-energy resonator, the overall system dissipation measured via its mechanical Quality factor is determined by coatings. With BAW quartz resonator losses decreasing from 10 −7 to almost as low as 10 −10 at liquid helium temperatures [5,6], the approach might be used applied for tests from 20K and below. The numerical values can be obtained for modes spanning over almost two decades, 1-100MHz, as measurements of high overtone (OT) modes has been demonstrated [5].…”

Section: Introductionmentioning

confidence: 99%

“…With BAW quartz resonator losses decreasing from 10 −7 to almost as low as 10 −10 at liquid helium temperatures [5,6], the approach might be used applied for tests from 20K and below. The numerical values can be obtained for modes spanning over almost two decades, 1-100MHz, as measurements of high overtone (OT) modes has been demonstrated [5].…”

Section: Introductionmentioning

confidence: 99%

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A new method of probing mechanical losses of coatings at cryogenic temperatures

Galliou

Deléglise

Goryachev

et al. 2016

Review of Scientific Instruments

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A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of extremely high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coatings nowadays. The approach is demonstrated for Chromium, Chromium/Gold and a multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10 −5 near 30 MHz at 4 K. The results are compared to the previous measurements.

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Section: Results With Metal Coatingsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new method of probing mechanical losses of coatings at cryogenic temperatures

Galliou

Deléglise

Goryachev

et al. 2016

Review of Scientific Instruments

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“…This is mainly due to the relatively high mechanical frequencies and extremely high Q-factors achievable in such devices at cryogenic temperatures (Q > 10 9 ), which potentially lead to extraordinarily large coherence times [2][3][4] beyond the capability of any other competing technology compared in [5]. This uniqueness has been perfected for decades for precision room temperature oscillators and related devices [6,7], culminating in Q × f -products as high as 2 · 10 13 Hz [8].…”

mentioning

confidence: 99%

Observation of the fundamental Nyquist noise limit in an ultra-high Q-factor cryogenic bulk acoustic wave cavity

Goryachev

Ivanov

Kann

et al. 2014

Applied Physics Letters

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Thermal Nyquist noise fluctuations of high-Q Bulk Acoustic Wave (BAW) cavities have been observed at cryogenic temperatures with a DC Superconducting Quantum Interference Device (SQUID) amplifier. High Q modes with bandwidths of few tens of milliHz produce thermal fluctuations with a Signal-To-Noise ratio of up to 23dB. The estimated effective temperature from the Nyquist noise is in good agreement with the physical temperature of the device, confirming the validity of the equivalent circuit model and the non-existence of any excess resonator self-noise. The measurements also confirm that the quality factor remains extremely high (Q > 10 8 at low order overtones) for very weak (thermal) system motion at low temperatures, when compared to values measured with relatively strong external excitation. This result represents an enabling step towards operating such a high-Q acoustic device at the standard quantum limit.Phonon-trapping Bulk Acoustic Wave (BAW) cavity resonator technology shows great potential for use in applications that require precision control, measurement and sensing at the quantum limit [1]. This is mainly due to the relatively high mechanical frequencies and extremely high Q-factors achievable in such devices at cryogenic temperatures (Q > 10 9 ), which potentially lead to extraordinarily large coherence times [2][3][4] beyond the capability of any other competing technology compared in [5]. This uniqueness has been perfected for decades for precision room temperature oscillators and related devices [6,7], culminating in Q × f -products as high as 2 · 10 13 Hz [8]. Interestingly, it is no longer the deficiency of the Q-factor, which halts further progress in the reduction of phase fluctuations, but rather the intrinsic fluctuations of the BAW resonator itself [9,10]. In particular, it has been concluded that further improvement of BAW based frequency sources could only be achieved by reducing the resonator flicker phase self-noise, since this is the dominant noise source of ultra-stable BAW oscillators both at cryogenic and room temperature [9,11].The origin of the flicker frequency noise is still poorly understood despite its significant influence on many systems [12,13] ranging from biological substances[14] to superconducting electronics [15,16]. The influence on the frequency stability of high-performance quartz oscillators on time scales of order 1-10 seconds is welldocumented [10,17,18] with several attempts to understand its origins [19][20][21]. It is also important for other mechanical resonators such as High Overtone [22] and Thin Film[23] BAW devices. On the other hand, coherence times of ultra-high Q quartz BAW cavities are predicted * maxim.goryachev@uwa.edu.au to exceed 10 seconds. Thus, the question of the influence of low Fourier frequency noise has never been raised with respect to these types of measurements due to the relatively low Q factors of the mechanical resonators utilised so far [24][25][26]. So, this type of noise can be another limiting factor on the coherence times of...

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Optical Control of Bulk Phonon Modes in Crystalline Solids

2021

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Long-lived phonons within crystalline bulk acoustic wave (BAW) resonators have become coherent carriers of information, which can be utilized for a variety of scientific and technological applications. Herein, a brief introduction to the field of phonon control is given with an emphasis on bulk phonons at high frequencies within crystalline solids. In cavity optomechanics, the photons and phonons can be confined by material boundaries, yielding large optomechanical coupling rates at gigahertz (GHz) frequencies, but the spurious heating is detrimental to robust operation. Although electromechanical techniques can be used to access long-lived phonons in piezoelectric crystals, they are not suitable for the study of non-piezoelectric crystals. The phase-matched Brillouin interactions enable efficient optical access GHz frequency mechanical modes within macroscopic crystalline solids. Combining with the well-established framework of cavity optomechanics, efficient optical control of BAWs can be obtained. For optical phonons, strong spontaneous Raman cooling and heating based on the interaction between excitons and phonons are considered. In addition, the application of optical phonons in quantum memory at room temperature is introduced. The review finishes with a discussion of the research direction for bulk optomechanical systems and exciton-phonon coupling systems in the future.

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Observation of Rayleigh Phonon Scattering through Excitation of Extremely High Overtones in Low-Loss Cryogenic Acoustic Cavities for Hybrid Quantum Systems

Cited by 62 publications

References 23 publications

A new method of probing mechanical losses of coatings at cryogenic temperatures

A new method of probing mechanical losses of coatings at cryogenic temperatures

Observation of the fundamental Nyquist noise limit in an ultra-high Q-factor cryogenic bulk acoustic wave cavity

Optical Control of Bulk Phonon Modes in Crystalline Solids

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