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Bose-Hubbard models with photon pairing in circuit-QED

AuthorsVillalonga Correa, Benjamín; Kurcz, Andreas ; García-Ripoll, Juan José
[PACS] Cavity quantum electrodynamics
[PACS] Superconducting devices
[PACS] Quantum computation architectures and implementations
Issue Date2013
PublisherInstitute of Physics Publishing
CitationJournal of Physics B: Atomic, Molecular and Optical Physics 46: 224024 (2013)
AbstractIn this work, we study a family of bosonic lattice models that combine an on-site repulsion term with a nearest-neighbour pairing term, ∑iα i †α i+1 † + 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. © 2013 IOP Publishing Ltd.
Identifiersdoi: 10.1088/0953-4075/46/22/224024
issn: 0953-4075
Appears in Collections:(CFMAC-IFF) Artículos
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