We investigate the nonlinear interaction between a squeezed cavity mode and mechanical in an optomechanical system (OMS) that allows us to selectively obtain either radiation-pressure coupling or parametric-amplification process. The squeezing of can enhance strength into single-photon strong-coupling regime, even when OMS is originally weak-coupling regime. Moreover, noise be suppressed completely by introducing broadband-squeezed vacuum phase-matched with parametric amplification squeezes...

We demonstrate PT-symmetry-breaking chaos in an optomechanical system, which features ultralow driving threshold. In principle, this will emerge once a laser is applied to the cavity mode and lasts for period of time. The strength inversely proportional starting time chaos. This originally comes from dynamical enhancement nonlinearity by field localization phase. Moreover, switchable tuning system parameters so that PT-symmetry phase transition occurs. work may fundamentally broaden regimes...

Optomechanically-induced transparency (OMIT) and the associated slowing of light provide basis for storing photons in nanoscale devices. Here we study OMIT parity-time (PT)-symmetric microresonators with a tunable gain-to-loss ratio. This system features reversed, non-amplifying transparency, i.e., an inverted-OMIT. When ratio is varied, exhibits transition from PT-symmetric phase to broken-PT-symmetric phase. PT-phase results reversal pump gain dependence transmission rates. Moreover, show...

Quantum squeezing in mechanical systems is not only a key signature of macroscopic quantum effects, but can also be utilized to advance the metrology weak forces. Here we show that strong steady state generated an optomechanical system with nonlinearity and red-detuned monochromatic driving on cavity mode. The achieved as joint effect nonlinearity-induced parametric amplification cooling, robust against thermal fluctuations

We analyze hybrid absorptive-dispersive optical bistability (OB) and multistability (OM) behavior in a generic $N$-type atomic system driven by degenerate probe field coherent coupling means of unidirectional ring cavity. show that the OB can be controlled adjusting intensity detuning field, OM also observed under appropriate detuning. The influence cooperation parameter on is discussed.

Quantum entanglement in mechanical systems is not only a key signature of macroscopic quantum effects, but has wide applications technologies. Here we proposed an effective approach for creating strong steady-state between two directly coupled oscillators (or oscillator and microwave resonator) modulated optomechanical system. The achieved by combining the processes cavity cooling two-mode parametric interaction, which can surpass bound on maximal stationary from interaction. In principle,...

We demonstrate theoretically the bundle emission of $n$ strongly correlated phonons in an acoustic cavity QED system. The mechanism relies on anti-Stokes resonances that generate super-Rabi oscillations between states with a large difference their number excitations, which, combined dissipation, transfer coherently pure $n$-phonon outside cavity. This process works close to perfect purity over wide range parameters and is tunable optically well-resolved operation conditions. broadens realm...

We demonstrate the emergence of nonreciprocal superradiant phase transitions and novel multicriticality in a cavity quantum electrodynamics (QED) system, where two-level atom interacts with two counter-propagating modes whispering-gallery-mode (WGM) microcavity. The rotates at certain angular velocity, is directionally squeezed by unidirectional parametric pumping $\chi^{(2)}$ nonlinearity. combination rotation directional squeezing leads to first- second-order transitions. These do not...

Realizing precise control over multiquanta emission is crucial for quantum information processing, especially when integrated with advanced techniques of manipulating states. Here, by spinning the resonator to induce Sagnac effect, we can obtain nonreciprocal photon-phonon and photon-magnon super-Rabi oscillations under conditions optically driving resonance transitions. Opening dissipative channels such enables realization directional bundle emissions entangled pairs transferring pure state...

The nonlinear quantum regime is crucial for implementing interesting effects, which have wide applications in modern science. Here we propose an effective method to reach the a modulated optomechanical system (OMS), originally weak-coupling regime. mechanical spring constant and interaction are periodically. This leads result that resonant can be effectively enhanced into single-photon strong-coupling by modulation-induced parametric amplification. Moreover, amplified phonon noise suppressed...

We explore the photon-controlled phonon statistics in a hybrid spin-optomechanical system. Here proposed blockade is based on nonlinearity of system induced by strong spin-mechanical coupling. Our approach involves introducing an ancillary quadratic optomechanical coupling (i.e., cavity field quadratically coupled to mechanical motion) and simultaneously considering with single photon. By injecting auxiliary photons, one can not only enhance spin-resonator interaction, but also realize fully...

We predict the occurrence of single-photon-induced entanglement and quantum superposition in a hybrid model, introducing an optomechanical coupling into Rabi model. Originally, it comes from photon-dependent property ground state featured by proposed It is associated with phase transition, immune to ${A}^{2}$ term spin-field interaction. Moreover, obtained actually squeezed cat state, which can significantly enhance precision metrology. This work offers approach manipulate single photon,...

Sum sideband generation in a generic optomechanical system is discussed the parameter configuration of optomechanically induced transparency. The nonlinear terms dynamics are taken account and features sum identified based on analytical treatment. interactions between cavity fields mechanical oscillation, which emerging as new frontier optomechanics, responsible for frequency components at sideband. We analyze detail influences some parameters, including pump power control field frequencies...

Superradiant phase transition (SPT) in thermal equilibrium, as a fundamental concept bridging the statistical physics and electrodynamics, can offer key resources for quantum information science. Notwithstanding its practical significances, equilibrium SPT has never been observed experiments since first proposal 1970s. Furthermore, existence of cavity electrodynamics (QED) systems is still subject ongoing debates, due to no-go theorem induced by so-called A2 term. Based on platform nuclear...

We demonstrate symmetry protected multiphoton bundle emission in the cavity QED system under ultrastrong coupling regime. Our proposal only enables super-Rabi oscillations with periodic generation of even correlated photons cavity, which is realized by combining laser driven flip qubit and conserved transitions induced Rabi interaction parity symmetry. Combined dissipation, $2n$-photon emissions are allowed, due to almost perfect suppression odd photons. Meanwhile, corresponding purities...

We theoretically predict the squeezing-induced point-gap topology together with a symmetry-protected ${\mathbb{Z}}_{2}$ ``skin effect'' in one-dimensional (1D) quadratic-bosonic system. Protected by time-reversal symmetry, such is associated novel invariant (similar to quantum spin-Hall insulators), which fully capable of characterizing occurrence skin effect. Focusing on zero energy, parameter regime this effect phase diagram just corresponds ``real- and coexisting topological phase.''...

We investigate theoretically optomechanically induced transparency in a whispering-gallery-mode microresonator coupled with three nanoparticles. find that the presence of third nanoparticle makes transmission rate more sensitive vicinities exceptional points (EPs). In addition, we also adjusting relative position nanoparticles so system is near or far from EPs can realize switching probe light between slow and fast light. Our finding not only provides an alternative way to tune spread but...

We propose a scheme for deterministically generating three-dimensional (3D) entanglement between two distant five-level atoms based on the dispersive atom-field interaction. In our scheme, are trapped separately in spatially separated optical cavities coupled by an fiber. To check experimental feasibility of we numerically simulated effects atomic spontaneous decay and photon leakage out fiber, numerical simulation shows that those can be suppressed appropriately choosing frequency detuning...

In this article, a theoretical scheme is proposed to investigate the formation and propagation of three-wave coupled vector optical solitons with ultraslow group velocities in lifetime-broadened seven-state triple-$\ensuremath{\Lambda}$ atomic system under Raman excitation. We show that presence weak applied magnetic field removes degeneracy corresponding sublevels medium, three continuous-wave control fields circularly left or right polarized induce quantum interference effect which can...

We propose a hybrid quantum model combining cavity QED and optomechanics, which allows the occurrence of equilibrium superradiant phase transition (QPT) triggered by single photon. This single-photon-triggered QPT exists both in cases ignoring including so-called $A^2$ term, i.e., it is immune to no-go theorem. It originally comes from photon-dependent criticality featured proposed model. Moreover, reversed induced competition between introduced term optomechanical interaction. work offers...

We investigate theoretically the model of a cavity-quantum-electrodynamics (QED) system that consists two two-level atoms coupled to single-mode cavity in weak coupling regime, where is driven by quantum light. The dynamics behavior entire tackled framework cascaded system. find two-photon blockade with bunching and three-photon antibunching can be obtained even when strong dissipation included. This result shows our work has potential for realizing entangled photon pairs weakly cavity....

Strong quantum nonlinearity gives rise to many interesting effects and has wide applications in physics. Herewe investigate the nonlinear effect of an optomechanical system (OMS) consisting both linear quadratic coupling. Interestingly, a controllable is obtained by applying driving laser into cavity. This can be enhanced strong coupling regime, even if initially weak-coupling regime. Moreover, dissipation suppressed effectively, which allows appearance phonon sideband photon blockade work...

We investigate theoretically nonreciprocal chaos in a spinning optomechanical resonator. find that under the Sagnac effect induced by resonator, chaotic motion can exhibit unidirectional behavior. More specifically, takes place when resonator is driven chosen direction, whereas it cannot emerge driving laser applied opposite direction. Moreover, due to effect, we show resist backscattering losses. The underlying reason for these phenomena induces an frequency shift between clockwise and...

We theoretically investigate optical bistability (OB) behaviour in a four-level atomic system confined unidirectional ring cavity. It is shown that OB can be controlled by adjusting the intensity of coupling field and value cooperativity parameter. More importantly, our numerical results show threshold reduced without decreasing range hysteresis loop via effect spontaneously generated coherence (SGC) or relative phase between two applied fields. The influence frequency detuning on also discussed.

We show that optical solitons can be obtained with a one-dimensional optomechanical array consists of chain periodically spaced identical systems. Unlike conventional solitons, which originate from nonlinear polarization, the soliton here stems new mechanism, namely, phonon-photon interaction. Under proper conditions, induced nonlinearity refers to will exactly compensate dispersion caused by photon hopping adjacent Moreover, are capable exhibiting very low group velocity, depending on rate,...