A Quantum Top Inside a Bose Josephson Junction

Abstract

We consider an atomic quantum dot confined between two weakly-coupled Bose-Einstein condensates, where the dot serves as an additional tunneling channel. It is shown that the thus-embedded atomic quantum dot is a pseudospin subject to an external torque, and therefore equivalent to a quantum top. We demonstrate by numerical analysis of the time-dependent coupled evolution equations that this microscopic quantum top is very sensitive to any deviation from linear oscillatory behavior of the condensates. For sufficiently strong dot-condensate coupling, the atomic quantum dot can induce or modify the tunneling between the macroscopic condensates in the two wells.

4 pages of RevTex4, 4 figures; rewritten discussion and displayed new results

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Cited by in corpus (14)

• Quantum dynamics of an atomic double-well system interacting with a trapped ion
• Impurity in a bosonic Josephson junction: swallowtail loops, chaos, self-trapping and the poor man's Dicke model
• Impurity in a Bose-Einstein condensate in a double well
• Coherent single atom shuttle between two Bose-Einstein condensates
• Tunneling dynamics of bosonic Josephson junctions assisted by a cavity field
• State engineering of impurities in a lattice by coupling to a Bose gas
• Dissipative Bose-Josephson junction coupled to bosonic baths
• Critical exponents for an impurity in a bosonic Josephson junction: Position measurement as a phase transition
• Interaction-controlled impurity transport in trapped mixtures of ultracold bosons
• Nonequilibrium properties of an atomic quantum dot coupled to a Bose-Einstein condensate
• Two atomic quantum dots interacting via coupling to BECs
• Topologically protected Bell-cat states in a simple spin model
• Dynamical formation of two-fold fragmented many-body state induced by an impurity in a double-well
• False signals of chaos from quantum probes