Coherently controlled entanglement generation in a binary Bose-Einstein condensate

Considering a two-component Bose-Einstein condensate in a double-well potential, a method to generate a Bell state consisting of two spatially separated condensates is suggested. For repulsive interactions, the required tunnelling control is achieved numerically by varying the amplitude of a sinusoidal potential difference between the wells. Both numerical and analytical calculations reveal the emergence of a highly entangled mesoscopic state.Comment: 6 pages, 6 figures, epl2.cl

Dynamical studies of macroscopic superposition states: Phase engineering of controlled entangled number states of Bose-Einstein condensate in multiple wells

We provide a scheme for the generation of entangled number states of Bose-Einstein condensates in multiple wells with cyclic pairwise connectivity. The condensate ground state in a multiple well trap can self-evolve, when phase engineered with specific initial phase differences between the neighboring wells, to a macroscopic superposition state with controllable entanglement -- to multiple well generalization of double well NOON states. We demonstrate through numerical simulations the creation of entangled states in three and four wells and then explore the creation of "larger" entangled states where there are either a larger number of particles in each well or a larger number of wells. The type of entanglement produced as the particle numbers, or interaction strength, increases changes in a novel and initially unexpected manner.Comment: 13 pages, 14 figure

Kualitas Pelayanan Publik di Desa Potanga Kecamatan Boliyohuto Kabupaten Gorontalo

This research used a qualitative method through natulastic approach as the part of the government research, with the aim to determine the public services quality also obstacles in improving of public services effort quality in village of Potanga sub-district of Boliyohuto. Source of research data enable two data sources are sources of primary data and source secondary data. Based on the research result can be described; (1) Effort to improve public services in village of Potanga can be identified as follow; a) to improve the principle of public services; b) the principle of public services; and c) to improve public service standarts. (2) Efforts to improve the public services in village of Potanga can be caterogized as good and in accordance with the public service policies, laws, public service, and the role, duties and responsibilities of the village government to the public service. (3) Obstackle in improving of the public services effort quality in villafe of Potanga, that is internal resistance in the form of problem officer/staff both the term of quantity nor in term of the quality of human resources. (4) External obstacles sourced from the society reason of physical and phycological and environmental. Penelitian ini menggunakan metode kualitatif melalui pendekatan naturalistik sebagai bagaian dari penelitian pemerintahan, dengan tujuan untuk mengetahui kualitas pelayanan publik serta hambatan dalam upaya peningkatan kualitas pelayanan publik didesa Potanga Kecmatan Boliyohuto. Sumber data penelitian memfungsikan dua sumber data yaitu sumber data primer dan sumber data sekunder Berdasarkan hasil penelitian dapat diuraikan; (1) Upaya peningkatan pelayanan publik didesa Potanga dapat diidentifikasi sebagai berikut; a) peningkatan azas layanan publik; b) prinsip layanan publik; dan c) peningkatan standar layanan publik. (2) Upaya peningkatan pelayanan publik didesa Potanga dapat dikategorikan baik dan telah sesuai dengan kebijakan pelayanan publik, undang-undang pelayanan publik, serta peran, tugas dan tanggung jawab pemerintah desa terhadap pelayanan publik. (3) Hambatan upaya-upaya peningkatan kualitas pelayanan publik di desa Potanga, yaitu hambatan internal berupa masalah aparat/staf baik dari segi kuantitas maupun dalam hal kualitas sumber daya manusia (4) Hambatan eksternal bersumber dari masyarakat karena alasan fisik dan psikis dan lingkunga

Canonical Trajectories and Critical Coupling of the Bose-Hubbard Hamiltonian in a Harmonic Trap

Quantum Monte Carlo (QMC) simulations and the Local Density Approximation (LDA) are used to map the constant particle number (canonical) trajectories of the Bose Hubbard Hamiltonian confined in a harmonic trap onto the $(\mu/U,t/U)$ phase diagram of the uniform system. Generically, these curves do not intercept the tips of the Mott insulator (MI) lobes of the uniform system. This observation necessitates a clarification of the appropriate comparison between critical couplings obtained in experiments on trapped systems with those obtained in QMC simulations. The density profiles and visibility are also obtained along these trajectories. Density profiles from QMC in the confined case are compared with LDA results.Comment: New version of figure 1