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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Qubit-controlled optical nonreciprocity in hybrid optomechanical spinning resonators

Imran M. Mirza, Wenchao Ge

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We study probe light transmission in hybrid qubit-optomechanical spinning resonators. Under the weak atomic excitation limit, we find that the atom can control probe light transmission by opening a spinning rate-dependent reflection channel.
DOI
10.1364/cqo.2019.w6a.3

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Abstract The theoretical investigation into spatially coherent control over electromagnetically induced transparency is carried out within a hybrid cavity system comprising a three-level atomic configuration, a mechanical resonator, and an optical cavity. The interaction involves driving a composite vortex light (CVL) with a three-level medium. Our findings reveal that the input-output cavity field can be systematically adjusted, resulting in changes to the transmission spectrum of the weak probe light. The transmission spectrum of the output light can be spatially controlled by manipulating the orbital angular momentum of the CVL and through parametric modulation of the system. Our simulations present a flexible approach for managing light-matter interactions in a hybrid optomechanical system.
Abstract We study the pump-probe response in an optomechanical cavity accommodating an ensemble of two-level atoms interacting with a cavity mode, which is pumped by a strong driving field and probed by a weak signal field. The atomic excitation is examined without taking any approximations and may be in any regimes ranging from the low limit to the high limit for a given collective coupling constant between the atomic ensemble and the cavity mode. This then results in different absorption and dispersion spectra (such as optomechanically induced transparency, Fano-resonance, normal-mode splitting) when the excitation transfer from cavity mode to atomic ensemble is controlled to change from ineffective to effective. This indicates that a hybrid optomechanical response is indeed determined by the excitation of the atomic ensemble embedded in the optomechanical cavity. It is also of interest that the output signal component and the inside atomic polarization show either synchronous or asynchronous behaviors depending on how the atom-field detuning is chosen, i.e. equal to the mechanical resonator frequency or its negative. Such features may open up an effective avenue in coherently manipulating the internal atomic polarization via the external signal field, and vice versa.
We investigate the optical response properties of an atom-assisted spinning optomechanical system, in which a spinning optical resonator is coupled simultaneously to a two-level atomic ensemble and a mechanical resonator driven by a weak pump field. Remarkably, we demonstrate that by simply reversing the rotation direction, the system can be switched between a low-absorption electromagnetic and optomechanically induced transparency state and a high-absorption state, constituting a form of non-reciprocal optical control at the quantum level. Furthermore, by tuning the phase difference between the mechanical pump and the probe field, direction-dependent switching between absorption and gain is achieved. These non-reciprocal effects originate from the Sagnac-induced frequency shift in the optical mode, which leads to distinct optomechanical and atom-cavity couplings for opposite spinning directions. We also show that the absorption spectrum can be modulated by the angular velocity and the atomic number. Our results indicate that the optical properties of the hybrid system can be manipulated via the angular velocity, phase difference, and atom number, with potential applications in chiral photonic communications.
In this paper, we propose a scheme to theoretically study the optical nonreciprocal transmission in a hybrid system consisting of a spinning resonator and a three-level atom driven by a strong classical field. The research results show that interaction between atom and cavity modes brings about the multiple transmission bands. When the resonator rotates at a certain speed, nonreciprocal transmission occurs in multiple frequency bands. Moreover, by adjusting some parameters, such as Sagnac–Fizeau shift, Rabi frequency, coupling strengths between atom and cavity modes, as well as coupling strength between two cavity modes, the positions and widths of nonreciprocal transmission bands can be controlled effectively.
We explain the probe field transmission spectrum under the influence of a strong pump field in a hybrid optomechanical system, composed of an optical cavity, a mechanical resonator, and a two-level atom. We show fast (superluminal) and slow (subluminal) light effects of the transmitted probe field in the hybrid system for suitable parametric regimes. For the experimental accessible domain, we find that the fast light effect obtained for the single optomechanical coupling can further be enhanced with the additional atom-field coupling in the hybrid system. Furthermore, we report the existence of a tunable switch from fast to slow light by adjusting the atomic detuning with the anti-Stokes and Stokes sidebands, respectively, as ${\mathrm{\ensuremath{\Delta}}}_{a}=+{\ensuremath{\omega}}_{m}$ and $\ensuremath{-}{\ensuremath{\omega}}_{m}$. The reported characteristics are realizable in state-of-the-art laboratory experiments.