Strong mechanical squeezing in an unresolved-sideband optomechanical system

Zhang, Rong; Fang, Yinan; Wang, Yangyang; Chesi, Stefano; Wang, Ying-Dan

doi:10.1103/physreva.99.043805

Cited by 33 publications

(17 citation statements)

References 33 publications

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“…When the driving is above the threshold power, coherent oscillation (i.e., mechanical lasing) would occur in the mechanical mode. Moreover, this twomode squeezing interaction term will inevitably result in the quantum entanglement between the optical c 2 mode and the mechanical mode, as discussed in many previous works [24][25][26][27][28][29][30][31].…”

Section: Physical Systemmentioning

confidence: 99%

Quantum signatures of transitions from stable fixed points to limit cycles in optomechanical systems

et al. 2020

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Optomechanical systems, due to its inherent nonlinear optomechanical coupling, owns rich nonlinear dynamics of different types of motion. The interesting question is that whether there exist some common quantum features to infer the nonlinear dynamical transitions from one type to another. In this paper, we have studied the quantum signatures of transitions from stable fixed points to limit cycles in an optomechanical phonon laser system. Our calculations show that the entanglement of stable fixed points in the long run does not change with time, however, it will oscillate periodically with time at the mechanical vibration frequency for the limit cycles. Most strikingly, the entanglement quite close to the boundary line keeps as a constant, and it is very robust to the thermal phonon noise, as strong indications of this particular classical transitions.

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Section: Physical Systemmentioning

confidence: 99%

Quantum signatures of transitions from stable fixed points to limit cycles in optomechanical systems

et al. 2020

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“…We can get numbers with bad cavity corrections based on Ref. [82]. Squeezing of ∼ 1.5 dB is expected with our parameters, and at effective coupling of the red-detuned tone of 2π • 400 Hz, and with optimized pump power ratio.…”

Section: Reservoir Engineering Via Cavity Drivingmentioning

confidence: 60%

Prospects for observing gravitational forces between nonclassical mechanical oscillators

Liu,

Mummery,

Sillanpää

2020

Preprint

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Interfacing quantum mechanics and gravity is one of the great open questions in natural science. Micromechanical oscillators have been suggested as a plausible platform to carry out these experiments. We present an experimental design aiming at these goals, inspired by Schmöle et al., Class. Quantum Grav. 33, 125031 (2016). Gold spheres weighing on the order a milligram will be positioned on large silicon nitride membranes, which are spaced at submillimeter distances from each other. These mass-loaded membranes are mechanical oscillators that vibrate at ∼ 2 kHz frequencies in a drum mode. They are operated and measured by coupling to microwave cavities. First, we show that it is possible to measure the gravitational force between the oscillators at deep cryogenic temperatures, where thermal mechanical noise is strongly suppressed. We investigate the measurement of gravity when the positions of the gravitating masses exhibit significant quantum fluctuations, including preparation of the massive oscillators in the ground state, or in a squeezed state. We also present a plausible scheme to realize an experiment where the two oscillators are prepared in a two-mode squeezed motional quantum state that exhibits nonlocal quantum correlations and gravity the same time. Although the gravity is classical, the experiment will pave the way for testing true quantum gravity in related experimental arrangements. In a proof-of-principle experiment, we operate a 1.7 mm diameter Si3N4 membrane loaded by a 1.3 mg gold sphere. At 10 mK temperature, we observe the drum mode with a quality factor above half a million at 1.7 kHz, showing strong promise for the experiments. Following implementation of vibration isolation, cryogenic positioning, and phase noise filtering, we foresee that realizing the experiments is in reach by combining known pieces of current technology.

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“…In order to (3) prepare the test oscillator in a squeezed state, we use the results including bad-cavity corrections from Ref. [85]. Squeezing of about 1.5 dB is expected with our parameters, and at effective coupling of the red-detuned tone of 2π × 400 Hz, and with an optimized pump power ratio.…”

Section: Reservoir Engineering Via Cavity Drivingmentioning

confidence: 99%

Gravitational Forces Between Nonclassical Mechanical Oscillators

et al. 2021

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Interfacing quantum mechanics and gravity is one of the great open questions in natural science. Micromechanical oscillators have been suggested as a plausible platform to carry out these experiments. We present an experimental design aiming at these goals, inspired by Schmöle et al. [Class. Quantum Grav. 33, 125031 (2016)]. Gold spheres weighing of the order of a milligram will be positioned on large silicon nitride membranes, which are spaced at submillimeter distances from each other. These massloaded membranes are mechanical oscillators that vibrate at about 2 kHz frequencies in a drum mode. They are operated and measured by coupling to microwave cavities. First, we show that it is possible to measure the gravitational force between the oscillators at deep cryogenic temperatures, where thermal mechanical noise is strongly suppressed. We investigate the measurement of gravity when the positions of the gravitating masses exhibit significant quantum fluctuations, including preparation of the massive oscillators in the ground state, or in a squeezed state. We also present a plausible scheme to realize an experiment where the two oscillators are prepared in a two-mode squeezed motional quantum state that exhibits nonlocal quantum correlations and gravity at the same time. Although the gravity is classical, the experiment will pave the way for testing true quantum gravity in related experimental arrangements. In a proof-of-principle experiment, we operate a 1.7 mm diameter Si 3 N 4 membrane loaded by a 1.3 mg gold sphere. At a temperature of 10 mK, we observe the drum mode with a quality factor above half a million at 1.7 kHz, showing strong promise for the experiments. Following implementation of vibration isolation, cryogenic positioning, and phase noise filtering, we foresee that realizing the experiments is in reach by combining known pieces of current technology.

show abstract

Strong mechanical squeezing in an unresolved-sideband optomechanical system

Cited by 33 publications

References 33 publications

Quantum signatures of transitions from stable fixed points to limit cycles in optomechanical systems

Quantum signatures of transitions from stable fixed points to limit cycles in optomechanical systems

Prospects for observing gravitational forces between nonclassical mechanical oscillators

Gravitational Forces Between Nonclassical Mechanical Oscillators

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