Ground-State Cooling and High-Fidelity Quantum Transduction via Parametrically Driven Bad-Cavity Optomechanics

Abstract

Optomechanical couplings involve both beam-splitter and two-mode-squeezing types of interactions. While the former underlies the utility of many applications, the latter creates unwanted excitations and is usually detrimental. In this work, we propose a simple but powerful method based on cavity parametric driving to suppress the unwanted excitation that does not require working with a deeply sideband-resolved cavity. Our approach is based on a simple observation: as both the optomechanical two-mode-squeezing interaction and the cavity parametric drive induce squeezing transformations of the relevant photonic bath modes, they can be made to cancel one another. We illustrate how our method can cool a mechanical oscillator below the quantum back-action limit, and significantly suppress the output noise of a sideband-unresolved optomechanical transducer.

Optomechanical cooling with intracavity squeezed light

“…As observed in Ref. [11,13], the cooling dynamics with squeezed light (both injected or with internal OPO) are very efficient also in the unresolved sideband regime, that is when the cavity linewidth is much larger than the mechanical frequency. In this case, however, the two schemes are no more FIG.…”

“…Specifically, we can decompose the scattering rates, defined in Eq. (13), as the sum of three contributions…”

“…In cavity optomechanics [1], squeezed light has been studied as a powerful tool for improved detection sensitivity [2][3][4][5], for the preparation of quantum states of mechanical resonators [8,9], to achieve larger optomechanical coupling strength [6,7], and for enhanced optomechanical cooling [10][11][12][13]. In general one can consider two different scenarios.…”

Microwave-to-Optical Transduction Using a Mechanical Supermode for Coupling Piezoelectric and Optomechanical Resonators

“…To start, assuming that the optical pump field is in a coherent state such that its fluctuations are of those of vacuum, for finite optomechanical sideband resolution the two-mode-squeezing interaction produces a non-zero outgoing flux of noise quanta in the upper sideband (even in absence of signal input). This noise contribution can be suppressed by appropriately squeezing the incoming pump field so as to counteract (unwanted) squeezing due to finite sideband resolution of the cavity [69]. However, in the transducer optimization presented below, we will not explicitly invoke this technique.…”

Weak-force sensing with squeezed optomechanics

“…Figure 1 shows the schematics of intracavity squeezing in an OPA-assisted Fabry-Pérot cavity [46,47]. Previous researches on such squeezed quantum systems have usually focused on enhanced mechanical cooling [48][49][50][51] or squeezing [52][53][54] and enhanced light-matter coupling [55][56][57]. When light pressure couples to a movable mirror, coherent states are transformed into squeezed states of light [58], and this type of squeezing, referred to as ponderomotive squeezing [59], can be only used to evade back-action and thus it is less extensive than externally injecting a squeezed light [60] or generating intracavity squeezing via an OPA [46].…”