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Journal of Physics B: Atomic, Molecular and Optical Physics - latest papers

Latest articles for Journal of Physics B: Atomic, Molecular and Optical Physics

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  • Distribution and revival of tripartite Einstein–Podolsky–Rosen steering in all-optical correlated noise channel
    Quantum steering, also know as Einstein–Podolsky–Rosen steering, is a key resource in quantum information. It has significant application value for constructing secure quantum communication networks due to its unique asymmetric property. However, quantum steering is susceptible to decoherence. Decoherence occurs due to the interaction between a quantum system and its environment, and eventually leads to the reduction or even disappearance of steering. In this paper, we propose an all-optical correlated noise channel (ACNC) scheme based on four-wave mixing (FWM) processes, investigate the impact of noise in the channel and FWM gains on quantum steering characteristics as well as the capability of the ACNC to restore quantum steering. This scheme is achieved through optical nonlinear processes and avoids the electro-optic conversions and significantly expands the operational bandwidth. The research results show that the ACNC can effectively restore the damaged quantum steering. The range of one-way steering and genuine tripartite steering can be flexibly controlled by adjusting parameters. Moreover, the Gaussian steered monogamous relationships have also been verified. Our scheme provides new theoretical reference for constructing all-optical secure quantum networks.

  • Critical bound–continuum limit of the two-electron Zee-system interacting with the generalised exponential cosine screened Coulomb potential
    The effect of the generalised exponential cosine screened Coulomb potential (GECSCP) on the stability of a model two-electron atom (Ze+e+e) interacting via this type of potential has been investigated. GECSCP is taken in the form: (in a.u.), where µ ( ) and θ ( ) are two adjustable parameters. An extensive wavefunction, having 715 number of terms, is utilised to calculate the ground state energy of the model atom (for ) within the framework of the Ritz’s variational method. Convergence of the computed results with respect to the number of terms in the wavefunction is corroborated. An inclusive study is made on the variation of the ground state energy and other related quantities with respect to the parameters µ and θ. Special emphasis is given on the determination of the critical values of the parameters which correspond to the critical bound–continuum limits of the model atoms.

  • One-step preparation of 3D Bell and 3D GHZ states with Rydberg atoms
    Three-dimensional Bell states and GHZ states serve as representative examples of high-dimensional entangled states. In this paper, we propose a scheme for generating three-dimensional Bell and GHZ entangled states using Rydberg atoms. By leveraging Rydberg-mediated interactions and introducing detuning, the system is effectively simplified into a chain-like configuration. To design effective couplings, we employ a centrosymmetric Gaussian distribution and optimize the relevant parameters. Furthermore, we take into account decoherence factors including atomic spontaneous emission, dephasing effects and random noise. Numerical simulations indicate that the proposed scheme can achieve high fidelity.

  • A new variational wave-function ansatz for confined two-electron atomic systems
    In this paper, we propose a simple variational ansatz, to study confined two-electron atomic systems. Here, is the inter-electronic distance with the electron coordinates and , is the radius of the impenetrable well in which the two-electron atoms are confined, and C is the normalization constant. The function incorporates the Dirichlet boundary conditions at needed for the wave function of two-electron systems, and a and b are the variational parameters evaluated by minimizing the total energy functional of confined two-electron atoms. We also calculate the pressure and check the satisfaction of the virial relation for such systems. Our results for the ground-state energy and its components, radial distance moments, and pressure show agreement with the existing literature.

  • A hybrid microwave-optical interferometer for off-resonance two-photon detection
    We propose a new method for identifying if two molecules interact to form a compound molecule. It relies on exciting the sample with two different laser frequencies and measuring the relative phase change of the transmitted light. In this method, the sample is excited in the optical regime, where there is a strong response, and the phase is measured with a microwave interferometer. This method is very robust against external phase variations such as those introduced by temperature fluctuations, which is usually the dominant problem with interferometric measurements. We compare the proposed method with other traditional methods in a unified description to demonstrate that it has favorable scaling with the experimental parameters, such as power and detuning.