Multimode cold-damping optomechanics with delayed feedback

Sommer, Christian; Ghosh, Alekhya; Genes, Claudiu

doi:10.1103/physrevresearch.2.033299

Cited by 30 publications

(22 citation statements)

References 44 publications

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“…When the waveguide is included in the Hamiltonian, the Hilbert space can quickly become very large and so specialized methods are used to model its evolution. When limited to the linear regime, results can be computed analytically but this significantly restricts the phenomena that can be investigated [1,3,59,60]. A popular method for modelling coherent feedback is matrix product states (MPSs) [21,26,34,52,[61][62][63][64], a powerful technique where tensor networks are used to limit the entanglement within the Hilbert space.…”

Section: Introductionmentioning

confidence: 99%

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

2020

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We describe an efficient approach to modelling cavity quantum electrodynamics (QED) with a time-delayed coherent feedback using quantum trajectory simulations. An analytical set of equations is derived to exploit the advantages of trajectories in the presence of the non-Markovian dynamics, where adjustments to the standard stochastic dynamics are discussed. In the weak excitation regime, we first verify that our approach recovers known results obtained with other simulation methods and demonstrate how a coherent feedback loop can increase the photon lifetime in typical cavity-QED systems. We then explore the nonlinear few-photon regime of cavity-QED, under the restriction of at most one photon at a time in the feedback loop. In particular, we show how feedback affects the cavity photoluminescence (populations versus laser detuning), and describe how one must account for conditioning in the presence of feedback, specifically the system observables must be conditioned on no photon detections at the feedback output channel occurring.

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Section: Introductionmentioning

confidence: 99%

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

2020

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“…For the quantum information processing applications of optomechanical systems, mechanical resonators need to be close to their quantum ground-state [4,5]. To achieve this goal, different methods have been proposed and realized such as resolved sideband cooling [6][7][8][9][10][11][12][13], feedback-assisted cooling [14][15][16][17][18][19], and backaction cooling [20,21]. In a standard approach, thermal energy is removed from a single mode of mechanical resonator to bring its state near to the ground-state.…”

Section: Introductionmentioning

confidence: 99%

Ground-state cooling of mechanical resonators by hot thermal light

Naseem¹,

Müstecaplıoğlu²

2020

Preprint

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We propose a scheme to cool down a mechanical resonator to its quantum ground-state, which is interacting with a cavity mode via the optomechanical coupling. As opposed to standard laser cooling schemes where coherence renders the state of the resonator to its ground-state, here we use incoherent thermal light to achieve the same aim. We show that simultaneous cooling of two degenerate or near-degenerate mechanical resonators is possible in our scheme, which is otherwise a challenging goal to achieve in optomechanics. The generalization of this method to the simultaneous cooling of multiple resonators is straightforward. The underlying physical mechanism of cooling is explained by revealing a direct connection between the laser sideband cooling and “cooling by heating” in a standard optomechanical setting.

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“…Meanwhile, the dark mode formed in optomechanical systems involving two cavity modes and one mechanical mode has also been found [54][55][56][57]. So far, theoretical proposals for optomechanical cooling of multiple mechanical resonators coupled in-series have been proposed [58,59], and cooling of multimodes in a resonator have been analyzed with the cold-damping feedback method [60,61]. In addition, ground-state cooling of multiple mechanical resonators has been proposed based on synthetic magnetism [62] and reservoir engineering [63].…”

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confidence: 99%

Multimode Optomechanical Cooling via General Dark-Mode Control

Huang,

Lai,

Liu

et al. 2021

Preprint

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The dark-mode effect is a stubborn obstacle for ground-state cooling of multiple degenerate mechanical modes optomechanically coupled to a common cavity-field mode. Here we propose an auxiliary-cavity-mode scheme for simultaneous ground-state cooling of two degenerate or near-degenerate mechanical modes by breaking the dark mode. We find that the introduction of the auxiliary cavity mode not only breaks the dark-mode effect, but also provides a new cooling channel to extract the thermal excitations stored in the dark mode. We also study the general physical-coupling configurations for breaking the dark mode in a generalized network-coupled four-mode optomechanical system consisting of two cavity modes and two mechanical modes. We derive the analytical dark-mode-breaking condition in this system. Our results not only provide a general method to control various dark-mode and dark-state effects in physics, but also pave the way to the study of macroscopic quantum phenomena and applications in multiple-mechanical-resonator systems.

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Multimode cold-damping optomechanics with delayed feedback

Cited by 30 publications

References 44 publications

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

Quantum trajectory theory of few-photon cavity-QED systems with a time-delayed coherent feedback

Ground-state cooling of mechanical resonators by hot thermal light

Multimode Optomechanical Cooling via General Dark-Mode Control

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