| 1. |
- Engelsen, Nils Johan, 1987, et al.
(författare)
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Ultrahigh-quality-factor micro- and nanomechanical resonators using dissipation dilution
- 2024
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Ingår i: Nature Nanotechnology. - 1748-3387 .- 1748-3395. ; 19:6, s. 725-737
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Forskningsöversikt (refereegranskat)abstract
- Mechanical resonators are widely used in sensors, transducers and optomechanical systems, where mechanical dissipation sets the ultimate limit to performance. Over the past 15 years, the quality factors in strained mechanical resonators have increased by four orders of magnitude, surpassing the previous state of the art achieved in bulk crystalline resonators at room temperature and liquid helium temperatures. In this Review, we describe how these advances were made by leveraging ‘dissipation dilution’—where dissipation is reduced through a combination of static tensile strain and geometric nonlinearity in dynamic strain. We then review the state of the art in strained nanomechanical resonators and discuss the potential for even higher quality factors in crystalline materials. Finally, we detail current and future applications of dissipation-diluted mechanical resonators.
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| 2. |
- Huang, Guanhao, et al.
(författare)
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Measuring the quantum vibrations of a small drum at room temperature
- 2024
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- A combination of technical improvements in noise mitigation enabled the observation of the quantum force of light on a millimetre-scale drum at room temperature. This experimental system permits the drum's position to be measured with an accuracy close to the quantum limit.
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| 3. |
- Huang, Guanhao, et al.
(författare)
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Room-temperature quantum optomechanics using an ultralow noise cavity
- 2024
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Ingår i: Nature. - 0028-0836 .- 1476-4687. ; 626:7999, s. 512-516
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Tidskriftsartikel (refereegranskat)abstract
- At room temperature, mechanical motion driven by the quantum backaction of light has been observed only in pioneering experiments in which an optical restoring force controls the oscillator stiffness1,2. For solid-state mechanical resonators in which oscillations are controlled by the material rigidity, the observation of these effects has been hindered by low mechanical quality factors, optical cavity frequency fluctuations3, thermal intermodulation noise4,5 and photothermal instabilities. Here we overcome these challenges with a phononic-engineered membrane-in-the-middle system. By using phononic-crystal-patterned cavity mirrors, we reduce the cavity frequency noise by more than 700-fold. In this ultralow noise cavity, we insert a membrane resonator with high thermal conductance and a quality factor (Q) of 180 million, engineered using recently developed soft-clamping techniques6,7. These advances enable the operation of the system within a factor of 2.5 of the Heisenberg limit for displacement sensing8, leading to the squeezing of the probe laser by 1.09(1) dB below the vacuum fluctuations. Moreover, the long thermal decoherence time of the membrane oscillator (30 vibrational periods) enables us to prepare conditional displaced thermal states of motion with an occupation of 0.97(2) phonons using a multimode Kalman filter. Our work extends the quantum control of solid-state macroscopic oscillators to room temperature.
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