Two atomic quantum dots interacting via coupling to BECs

Abstract

We consider a system of three weakly coupled Bose-Einstein condensates and two atomic quantum dots embedded in the barriers between the condensates. Each dot is coupled to two neighboring condensates by optical transitions and can be described as a two-state system, or a pseudospin 1/2. Although there is no direct coupling between the dots, an effective interaction between the pseudospins is induced due to their coupling to the condensate reservoirs. We investigate this effective interaction, depending on the strengths of the dot-condensate coupling T and the direct coupling J between the condensates. In particular, we show that an initially ferromagnetic arrangement of the two pseudospins stays intact even for large T/J. However, antiferromagnetically aligned spins undergo peculiar "breathing" modes for weak coupling T/J<1, while for strong coupling the behaviour of the spins becomes uncorrelated.

5 pages, 7 figures

References in corpus (9)

• Direct Observation of Tunneling and Nonlinear Self-Trapping in a single Bosonic Josephson Junction
• Atomic quantum dots coupled to BEC reservoirs
• Casimir forces between defects in one-dimensional quantum liquids
• Interaction of Impurity Atoms in Bose-Einstein-Condensates
• Cooling trapped atoms in optical resonators
• Dissipative Quantum Ising model in a cold atomic spin-boson mixture
• Dynamical Instability in a Trimeric Chain of Interacting Bose-Einstein Condensates
• Coherent single atom shuttle between two Bose-Einstein condensates
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Cited by in corpus (3)

• Driven dissipative dynamics and topology of quantum impurity systems
• Entanglement generation in a system of two atomic quantum dots coupled to a pool of interacting bosons
• Manipulating the Mott lobes: optical lattice bosons coupled to an array of atomic quantum dots