Observation of the fundamental Nyquist noise limit in an ultra-high Q-factor cryogenic bulk acoustic wave cavity
| Autor: | Eugene Ivanov, Maxim Goryachev, Frank Van Kann, Serge Galliou, Michael E. Tobar |
|---|---|
| Přispěvatelé: | Center of Excellence for Engineered Quantum Systems, School of Physics (ARC), The University of Western Australia (UWA), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2014 |
| Předmět: |
[SPI.OTHER]Engineering Sciences [physics]/Other
Quantum Physics Physics - Instrumentation and Detectors Materials science Statistical Mechanics (cond-mat.stat-mech) Physics and Astronomy (miscellaneous) Quantum limit Amplifier FOS: Physical sciences Thermal fluctuations Johnson–Nyquist noise Instrumentation and Detectors (physics.ins-det) 7. Clean energy 01 natural sciences Computational physics Resonator Signal-to-noise ratio Q factor 0103 physical sciences Equivalent circuit Quantum Physics (quant-ph) 010306 general physics 010301 acoustics Condensed Matter - Statistical Mechanics |
| Zdroj: | Applied Physics Letters Applied Physics Letters, American Institute of Physics, 2014, 105 (15), pp.153505 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.4898813 |
| Popis: | 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. appears in Appl. Phys. Lett (2014) |
| Databáze: | OpenAIRE |
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