Energy-localization-enhanced ground-state cooling of a mechanical resonator from room temperature in optomechanics using a gain cavity

Liu, Yulong; Liu, Yuxi

doi:10.1103/physreva.96.023812

Cited by 45 publications

(13 citation statements)

References 141 publications

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“…Energy localization and ground-state cooling at room temperature induced by broken PT symmetry have been proposed and discussed in detail in Refs. [71,72].…”

Section: Introductionmentioning

confidence: 99%

Energy-level attraction and heating-resistant cooling of mechanical resonators with exceptional points

2021

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We study the energy-level evolution and ground-state cooling of mechanical resonators under a synthetic phononic gauge field. The tunable gauge phase is mediated by the phase difference between the PT -and anti-PT -symmetric mechanical couplings in a multimode optomechanical system. The transmission spectrum then exhibits an asymmetric Fano line shape or a double optomechanically induced transparency by modulating the gauge phase. Moreover, the eigenvalues will collapse and become degenerate, although the mechanical coupling is continuously increased. Such counterintuitive energy-level attraction, instead of anticrossing, is attributed to destructive interferences between PT -and anti-PT -symmetric couplings. We find that the energy-level attraction, as well as the accompanying exceptional points (EPs), can be clearly observed in the cavity output power spectrum where the mechanical eigenvalues correspond to distinct peaks. For mechanical cooling, the average phonon occupation number is minimized at the EPs. Especially, phonon transport becomes nonreciprocal and even ideally unidirectional at the EPs. Finally, we propose a heating-resistant ground-state cooling based on the nonreciprocal phonon transport, which is mediated by the gauge field. Towards the quantum regime of macroscopic mechanical resonators, most optomechanical systems are ultimately limited by their intrinsic cavity or mechanical heating. Our work shows that the thermal energy transfer can be blocked by tuning the gauge phase, which suggests a promising route to bypass the heating limitations.

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“…Energy localization and ground-state cooling at room temperature induced by broken PT symmetry have been proposed and discussed in detail in Refs. [71,72].…”

Section: Introductionmentioning

confidence: 99%

Energy-level attraction and heating-resistant cooling of mechanical resonators with exceptional points

2021

Self Cite

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“…So far, several cooling mechanisms based on optomechanical systems, such as resolved-sideband cooling [33,34] and feedback-aided cooling [35,[44][45][46][47][48][49][50][51][52][53], have been proposed to cool mechanical resonators to their quantum ground states. To further develop cooling performance, various new cooling schemes have been proposed, such as those based on quantum interference [54][55][56], parity-time symmetric [57], modulated pulses [58,59], domino effect [60,61], strong couplings [62,63], and nonreciprocity [28,64]. Particularly, cooling of mechanical resonators has also been simultaneously achieved in optical [65][66][67][68][69] and microwave [70][71][72][73][74][75][76] platforms.…”

Section: Introductionmentioning

confidence: 99%

Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems

Lai,

Qin,

Hou

et al. 2021

Preprint

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“…By introducing the optical gain, nonreciprocity has recently been observed in parity-time-symmetric (PT -symmetric) microcavities with balanced gain and loss [28,48,49]. Subsequently, optomechanical systems with optical gain have witnessed rapid progress, including phonon laser [50,51], optomechanically induced transparency [52] and all-optical photon transport switching [53], PT -symmetry-breaking chaos [54], enhanced ground-state cooling of the mechanical resonator [55], and enhanced sensitivity of detecting the mechanical motion [56]. Here we show that the optomechanical system with optical gain can operate as a directional amplifier between the active and passive cavities, where the direction of amplification can be controlled by adjusting the phase differences between the effective optomechanical couplings.…”

Section: Introductionmentioning

confidence: 99%

Directional amplifier in an optomechanical system with optical gain

Jiang

Song

2018

Phys. Rev. A

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Directional amplifiers are crucial nonreciprocal devices in both classical and quantum information processing. Here we propose a scheme for realizing a directional amplifier between optical and microwave fields based on an optomechanical system with optical gain, where an active optical cavity and two passive microwave cavities are, respectively, coupled to a common mechanical resonator via radiation pressure. The two passive cavities are coupled via hopping interaction to facilitate the directional amplification between the active and passive cavities. We obtain the condition of achieving optical directional amplification and find that the direction of amplification can be controlled by the phase differences between the effective optomechanical couplings. The effects of the gain rate of the active cavity and the effective coupling strengths on the maximum gain of the amplifier are discussed. We show that the noise added to this amplifier can be greatly suppressed in the large cooperativity limit.

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Energy-localization-enhanced ground-state cooling of a mechanical resonator from room temperature in optomechanics using a gain cavity

Cited by 45 publications

References 141 publications

Energy-level attraction and heating-resistant cooling of mechanical resonators with exceptional points

Energy-level attraction and heating-resistant cooling of mechanical resonators with exceptional points

Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems

Directional amplifier in an optomechanical system with optical gain

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