A method for diffracting the weak probe beam into unidirectional and higher-order directions is proposed via a Rydberg electromagnetically induced grating, providing way implementations of quantum devices with cold atoms. The scheme utilizes suitable position-dependent adjustment to two-photon detuning besides modulation standing-wave coupling field, producing an in-phase which can change parity dispersion. We observe that when amplitude appropriate, perfect diffraction grating be realized....

By effectively controlling the dipole-dipole interaction, we investigate characteristics of ground state bright solitons in a spin-orbit coupled dipolar Bose-Einstein condensate. The atoms are trapped within double-lattice which consists linear and nonlinear lattice. We derive motion equations different spin components, taking mechanisms interaction into account. An analytical expression is derived. adjusting dipole polarization angle, can be adjusted from attraction to repulsion. On this...

We propose a scheme to realize parity-time (PT) symmetric photonic Lieb lattices of ribbon shape and complex couplings, thereby demonstrating the higher-order exceptional point (EP) Landau–Zener Bloch (LZB) oscillations in presence refractive index gradient. Quite different from non-Hermitian flatband with on-site gain/loss, which undergo thresholdless PT symmetry breaking, spectrum for such quasi-one-dimensional has completely real values when gradient is applied perpendicular ribbon,...

We study an ultracold atom-cavity coupling system, which had been implemented in experiment to display weak light nonlinearity [S. Gupta \textit{et al}., Phys. Rev. Lett. \textbf{99}, 213601 (2007)]. The model is described by a non-interacting Bose-Einstein condensate contained Fabry-P\'{e}rot optical resonator, two incommensurate standing-wave modes are excited and thus form quasiperiodic lattice potential for the atoms. Special emphasis paid variation of atomic wavefunction induced cavity...

Abstract Although periodic photonic structures, especially associated with nonlinearity, play a prominent role in optics nowadays, effective detection of their nonlinearity still remains critical challenge. Here, an approach is proposed to detect the lattices direct way. By properly launching structured beams, namely Airy into lattices, nonlinear response function discrete system can be directly obtained nonlinearly‐shaped beam profiles. To specific, single utilized map self‐defocusing while...

A Rydberg-blockade sphere provides an intriguing picture by which a number of collective many-body effects caused the strong Rydberg-Rydberg interactions can be clearly understood and profoundly investigated. In present work, we develop definition for effective two-atom blockade radius show that original spherically shaped surface would deformed when real atoms increases from two to three. This deformation reveals spatially anisotropic shrunken properties strongly depend on interatomic...

Rydberg blockaded gate is a fundamental ingredient for scalable quantum computation with neutral atoms. However the fidelity of such intrinsically limited by blockade error coming from level shift that forbids its extensive use. Based on dark-state adiabatic passage, we develop novel protocol realizing two-atom blockade-error-free in hybrid system simultaneous van der Waals (vdWsI) and resonant dipole-dipole interactions (DDI). The basic idea relies converting roles two interactions, which...

We propose to realize controllable squeezing states of ferromagnetic magnons with a spinor Bose-Einstein condensate confined in an optical lattice. use external laser field induce dipole-dipole interaction, which leads magnon excitations the system. By focusing on role long-range magnetic and interactions, we show that existence properties produced squeezed can be well controlled by tuning transverse trapping widths condensates. also this system have close analogy dynamical Casimir effect at...

We propose a physical scheme to study the formation of optical soliton molecules (SMs), consisting two solitons bound together with π-phase difference, and scattering SMs by localized parity-time (PT)-symmetric potential. In order stabilize SMs, we apply an additional space-dependent magnetic field introduce harmonic trapping potential for balance repulse interaction induced difference between them. On other hand, complex obeying PT symmetry can be created through incoherent pumping spatial...

Exceptional points (EPs) in non-Hermitian systems have attracted enormous attention and spawned intriguing prospects for the manipulation of waves. Despite many efforts focusing on exotic behaviors about EPs, there are only a few studies phase transitions involving multiple EPs. Here, by employing staggered couplings as well two pairs on-site gain/loss, we propose one-dimensional parity-time (PT)-symmetric Lieb photonic lattice demonstrate diverse such multiband structure. Owing to chiral...

The modulational instability of coherently excited spin waves is studied in an atomic chain spinor Bose-Einstein condensates (BECs) confined optical lattice. We examine the dependence stability on long-range nonlinear interaction at different lattice sites. coupling due to light-induced and static magnetic dipole-dipole between atoms. compare wave dynamics BECs formed with that a Heisenberg-like solid-state physics. This reveals important differences from short-range one.

We study cavity optomechanics of a mixture ultracold atoms with tunable nonlinear collisions. show that atomic collisions provide linear couplings between fictitious condensate oscillators, leading to possibilities achieving globally coupled quantum optomechanical network an integrated atom chip. Potential applications range from simulating collective nonequilibrium dynamics in fields well past physics probing unique properties mixtures.

Floquet Majorana edge modes capture the topological features of periodically driven p-wave superconductors. We present a Kitaev chain with multiple time periodic driving terms. Our results demonstrate how will affect bands in frequency space, leading to more robust against

We investigate band evolution of chiral and non-chiral symmetric flatband photonic rhombic lattices by applying a strain along the diagonal direction, thereby demonstrating Landau-Zener Bloch (LZB) oscillations in presence refractive index gradient. The are obtained adding detuning to uniform lattices. For lattices, middle is perturbed due symmetry breaking while nearly appears as bottom with increase strain-induced next-nearest-neighbor hopping. Consequently, LZB exhibit intriguing...

The coherent control of molecular alignment and orientation by a femtosecond two-color laser pulse is studied theoretically. effect the carrier-envelope phase on discussed, it shown that enhancement or suppression can be coherently manipulated precisely controlling pulse. In addition, time-dependent angular distributions axis are presented.

Higher-order exceptional points (EPs), which appear as multifold degeneracies in the spectra of non-Hermitian systems, are garnering extensive attention various multidisciplinary fields. However, constructing higher-order EPs still remains a challenge due to strict requirement system symmetries. Here we demonstrate that can be judiciously fabricated parity–time ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mi...

We point out that a train of optical solitons can be generated in cold-atom system by modulational instability (MI). By numerical simulation, we not only prove the MI analysis equations motion for atomic-state amplitudes and probe field replaced with one nonlinear Schrödinger equation, but also give similarities differences generation soliton wave between original Maxwell–Schrödinger equation. Through simulation equation motion, found single or couple achieved adjusting initial pulse...

We investigate the quantum interference of spin wave excitations a spin-1 atomic Bose condensate confined in an optical lattice. Single-channel and dual-channel interactions are employed our system, their induced compared. Also we consider interplay magneto-optical excitations, which leads to constructive or destructive effect for creation magnons based on background excitations. The population distributions excited can be well controlled by steering long-range dipole-dipole interactions....

We consider an antiferromagnetic spin-1 Bose-Einstein condensate confined in a Fabry-P\'erot optical resonator which the intracavity light field forms lattice potential for atoms. Special emphasis is paid to cavity-mediated superfluid--Mott-insulator transition. find that exotic phase diagrams can appear due competition between cavity-induced nonlinear interactions and atomic spin-dependent collision interactions.

Spinor condensates trapped in optical lattices have become potential candidates for multi-bit quantum computation due to their long coherence and controllability. But first, we need understand the generation regulation of spin magnetism system. This paper reviews origin manipulation atomic chains lattices. The theoretical study whole process is described this paper, including laser cooling, spinor Bose-Einstein condensate preparations, lattice, chain. Then, magnetic excitations are...

We theoretically study optomechanically induced transparency in a spinning Kerr-nonlinear resonator. The interplay between the optical Kerr effect and Sagnac provides flexible tool for modifying windows of signal comparing to system single It is found that will exhibit distinct phenomenon fast-to-slow light effects. More importantly, symmetric window appears by adjusting rotation-induced frequency shift compensate Kerr-induced shift. These results open up new way explore novel propagation...

We systematically investigate unconventional superfluid phases of fermionic dipolar particles lying in a double-wire setup with laser-assisted interwire tunneling. Our numerical simulations, based on the nonlocal Kohn-Sham Bogoliubov-de Gennes equation, reveal existence large Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) region stripe phase under an imbalance particle densities between two wires. When tunneling is present, it induces transition from FFLO to topological and associated Majorana zero...

To distinguish the contributions of electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS) in their applications precision laser spectroscopy, we propose a real-imaginary spectrum decomposition method to investigate spectra four-level microwave (MW) dressed Rydberg system. We show that opening windows absorption probe field is prominent character by EIT, EIT-ATS crossover, ATS when MW turned off intensity control adjusted. When on gradually increased, EIT destroyed...