Many-body quantum coherence and interaction blockade in Josephson-linked Bose-Einstein condensates

Abstract

We study many-body quantum coherence and interaction blockade in two Josephson-linked Bose-Einstein condensates. We introduce universal operators for characterizing many-body coherence without limitations on the system symmetry and total particle number $N$. We reproduce the results for both coherence fluctuations and number squeezing in {\em symmetric} systems of large $N$, and reveal several peculiar phenomena that may occur in {\em asymmetric} systems and systems of small $N$. For asymmetric systems, we show that, due to an interplay between asymmetry and inter-particle interaction, the coherence fluctuations are suppressed dramatically when $|E_C/E_J|\ll 1$, and both {\it resonant tunneling} and {\it interaction blockade} take place for large values of $|E_C/E_J|$, where $E_C$ and $E_J$ are the interaction and tunneling energies, respectively. We emphasize that the resonant tunneling and interaction blockade may allow creating single-atom devices with promising technology applications. We demonstrate that for the systems at finite temperatures the formation of self-trapped states causes an anomalous behavior.

6 pages, 5 figures, accepted for publication in EPL (Europhysics Letters)

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• Relationship between spin squeezing and single-particle coherence in two-component Bose-Einstein condensates with Josephson coupling
• Fractional photon-assisted tunneling for Bose-Einstein condensates in a double well
• Non-Gaussian Precision Metrology via Driving through Quantum Phase Transitions
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• Resonant persistent currents for ultracold bosons on a lattice ring
• Beyond mean-field behavior of large Bose-Einstein condensates in double-well potentials
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• Interplay of nonreciprocity and nonlinearity on mean-field energy and dynamics of a Bose-Einstein condensate in a double-well potential
• Quantum and thermal fluctuations in bosonic Josephson junctions
• Photon-induced sideband transitions in a many-body Landau-Zener process
• Simultaneous measurement of DC and AC magnetic fields at the Heisenberg limit
• Asymmetric sequential Landau-Zener dynamics of Bose condensed atoms in a cavity
• Multi-ion Mach-Zehnder interferometer with artificial nonlinear interactions
• Controlling dynamical entanglement in a Josephson tunneling junction
• Nonlinear dissipative dynamics of a two-component atomic condensate coupling with a continuum