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NONLINEAR TUNNELING INDUCED DYNAMIC-EFFECT OF BOSE–EINSTEIN CONDENSATES IN AN EXTENDED JOSEPHSON-JUNCTION MODEL

J.-L. LIU

Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

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and

J.-Q. LIANG

Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

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https://doi.org/10.1142/S0217984911027340Cited by:2 (Source: Crossref)

Abstract

In this paper, we investigated theoretically the dynamic effect induced by nonlinear tunneling of two weakly linked Bose–Einstein condensates in an extended boson Josephson-junction model, in which the two-body interaction is extended to neighboring lattice sites in strong interaction regime. As a consequence the dynamic properties compared with the usual Josephson-junction model are crucially modified by the atom-pair tunneling, which leads to the macroscopic quantum-states of coherent relative-phase between two condensates seen to be effective Schrödinger cat states. The relative-phase is controllable by system parameters and thus can be used to realize the qubit in quantum computation.

Keywords:

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