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...

A fiber in-line Mach-Zehnder interferometer based on dual inner air-cavities for simultaneous refractive index and temperature sensing is presented. The are fabricated by use of femtosecond laser micromachining, fusion splicing, slightly tapering techniques. transmission spectrum the exhibits a number resonance wavelength dips corresponding to different orders cladding modes. By tracking shift two dip wavelengths, changes can be obtained matrix method. sensitivities achieved 464.96 nm/RIU...

Adiabatically encircling an exceptional point (EP) in a two-dimensional parameter space usually leads to the flip of instantaneous eigenstates. However, dynamically EP will arouse chiral modes transfer. The obtained eigenstate is determined by direction. effect robust against size loop once enclosed loop. It has been reported theoretically that can also be observed when does not enclose but keeps it at proper distance. Here we experimentally validate theoretical prediction designing and...

This paper investigate the generation and evolution of continuous-variable entanglement in a two-mode single-atom laser, where atomic coherence is induced by two classical laser fields (pump coupling field) driving corresponding atom transitions. It found that intensity field can influence effectively period cavity field. More importantly, our numerical results also show between modes as well total mean photon number be increased synchronously adjusting frequency detuning.

The interaction between forward and backward waves in a periodical structure with -symmetric potential is investigated. results demonstrate that the -term can change bandgap of affect effective feedback mechanism. linear solution, reflectivity, dispersion relation, generalized analytical solution this are obtained. influences detunings on characteristic bistability (or multistability) also discussed.

Taking the decoherence effect due to population relaxation into account, we investigate entanglement properties for two qubits in Heisenberg XY interaction and subject an external magnetic Geld. It is found that phenomenon of sudden death (ESD) as well birth (ESB) appear during evolution process particular initial states. The influence Geld spin environment on ESD ESB are addressed detail. shown concurrence, a measure entanglement, can be controlled by tuning parameters chain, such...

We propose and demonstrate a pressure sensor based on an air cavity formed by the end face of single-mode fiber barium titanate microsphere surface. The distance between surface can be easily adjusted to allow tuning measurement range. In experiment, range achieved is from 0-0.1 0-1 MPa, sensitivities obtained are 3.23 4.10 nm/MPa. exhibits low-temperature cross-sensitivity less than ~1 kPa/°C has potential used in gas refractive index measurement.

We have successfully synthesized a series of Bi doped BaFe2As2 high quality single crystals for the first time. The x-ray diffraction (XRD) patterns show an expansion lattice parameter c with doping, indicating negative pressure effect. By investigating resistivity, Fermi liquid (FL) to non-Fermi (NFL) crossover is observed from normal state antiferromagnetic order state, accompanied by three superconducting transitions labeled as SC I, II and III which are supposed be induced realms various...

Long period fiber gratings were written directly on multi-core (MCF) with high frequency CO2laser. The two resonant depths offer the capabilities for achieving measurement of temperature and strain. maximum sensitivity was 70.3 pm/℃ strain 0.00307 dB/με. matrix obtained by depth (dip 2) can avoid cross realize simultaneous or

The intrinsic p-to-n transition mechanism for Mg3Sb2-based thermoelectrics is revealed through pristine Mg3Sb2 by tunning extra Mg. By using TEM characterization combined with transport measurements, the matrix proposed to have three stages of evolution increase in Mg content: vacancy-rich (Sb-rich phase) period, vacancy-compensated (nearly no precipitates) and vacancy-deficient (Mg-rich revealing that vacancy concentration a key factor transition. Our work will deepen understanding provide...

In this paper, simultaneous measurement of temperature and external refractive index (RI) is achieved in the presented scheme, which based on a Mach–Zehnder interferometer using nonadiabatic single-mode fiber taper without an air cavity. This scheme quite simple, smallest diameter tapered about 83.1 μm length 1 cm. The transmission spectrum exhibits number resonance wavelength dips that correspond to different orders cladding modes. can be used for RI sensing by monitoring...

In this paper, we study entanglement dynamics of a two-qubit extended Werner-like state locally interacting with independent noisy channels, i.e., amplitude damping, phase and depolarizing channels. We show that the purity initial entangled has direct impacts on robustness in each channel. That is, if is prepared mixed instead pure form, may exhibit sudden death (ESD) and/or be decreased for critical probability at which disappear.

Based on a cavity-assisted interaction by single-photon pulses, we propose scheme to implement two-qubit Grover search in distributed quantum network, with qubits encoded pairs of atoms dephasing-free subspace (DFS), which could strongly suppress collective dephasing errors and would be helpful for enhancing the fidelity implementation. Moreover, show that preparation entangled states transfer can completed our improved scheme, is very important compatibility scalability network.

In this paper, we investigate the entanglement dynamics of two entangled two-level atoms with initial X state and dipole-dipole coupling intensity in Tavis-Cummings model. The interesting phenomena sudden death as well birth appear during evolution process. We analyze detail effect purity initially atoms, between field Fock on apparition time birth. Furthermore, conditions for conversion can be generalized when is not pure. results show that above system parameters affect concurrence,...

The evolution of a pure coherent state into chaotic is described very well by master equation, as validated via an examination the state's during diffusion process, fully utilizing technique integration within ordered product (IWOP) operators. same equation also describes limitation that maintains coherence in weak i.e., when dissipation and initial average photon number large. This dρ/ dt = −κ[a+aρ −a+ρa − aρa+ + ρaa+]. physical difference between this better-known amplitude damping pointed out.

Based on constructive interference in Sagnac waveguide loop, an efficient scheme is proposed for selective frequency conversion and multifrequency modes W entanglement via input–output formalism. We can adjust the probability amplitudes of output photons by choosing parameter values properly. The tunable amplitude will lead to generation photon with a selectable photonic different frequencies wide range values. Our calculations show present robust deviation parameters spontaneous decay.

Taking the decoherence effect into account, entanglement evolution of a two-qubit anisotropic Heisenberg XYZ chain in presence inhomogeneous magnetic field is investigated. The time concurrence studied for initial state cos θ |01⟩ +sin θ|10⟩ at zero temperature. influences field, parameter and on dynamic are addressed detail, formula steady found. It shown that sudden death (ESD) birth (ESB) appear with effect, stable depends uniform B, Δ environment coupling strength γ, which independent...

By analysing the properties of two-mode quadratures in an entangled state representation (ESR) we derive from ESR some complicated exponential quadrature operators for nonlinear squeezing, which directly leads to wave function squeezed ESR.

In addition to the implementation of parity-time ($\mathcal{PT}$)-symmetric optical systems by carefully and actively controlling gain loss, we show that a $2\times 2$ $\mathcal{PT}$-symmetric Hamiltonian has unitarily equivalent representation without complex potentials in resulting coupler. Through Naimark dilation operator algebra, passive couplers can thus be implemented with refractive index real values asymmetric coupling coefficients. This opens up possibility implement general...

An alternative scheme is presented to realize an N-qubit W state with distant atoms trapped in spatially separated optical cavities coupled by fibers via a fractional adiabatic passage. The present tolerant device parameter nonuniformity and does not need accurately control the experimental time employing stimulated Raman In addition, excited states of are adiabatically eliminated no additional qubit required. Cavity decay, fiber losses atomic spontaneous emission can all be greatly...

We investigate the behaviour of geometric phase a bipartite system with intersubsystem coupling via quantum jump approach, where one subsystems is driven by one- or two-mode quantized field which also subjected to decoherence. The results show that first correction due decohering only quadratic in decaying rate λ when evolution adiabatic, and lowest order related non-adiabatic. Moreover, an interesting interpretation this phenomenon given.

This paper investigates the generation and evolution of continuous-variable entanglement in an asymmetric coupled-quantum well (CQW) system. Our numerical results show that this CQW system can be regarded as a source macroscopic entangled light over wide range initial states cavity field. investigation used for achieving solid-state medium, which is much more practical than atomic medium because its flexible design controllable interference strength.