Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 46, Issue 22, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/46/22/224024
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Funding
- European project PROMISCE
- Spanish MINECO project [FIS2012-33022]
- CAM research consortium QUITEMAD [S2009-ESP-1594]
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In this work, we study a family of bosonic lattice models that combine an on-site repulsion term with a nearest-neighbour pairing term, Sigma(i)a(i)(dagger)a(i+1)(dagger) + H.c. Like the original Bose-Hubbard model, the nearest-neighbour term is responsible for the mobility of bosons and it competes with the local interaction, inducing two-mode squeezing. However, unlike a trivial hopping, the counter-rotating terms form a pairing that cannot be studied with a simple mean-field theory and does not present a quantum phase transition in phase space. Instead, we show that there is a cross-over from a pure insulator to long-range correlations that start up as soon as the two-mode squeezing is switched on. We also show how this model can be naturally implemented using coupled microwave resonators and superconducting qubits.
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