Cooling and Autonomous Feedback in a Bose-Hubbard Chain with Attractive Interactions

We engineer a quantum bath that enables entropy and energy exchange with a one-dimensional Bose-Hubbard lattice with attractive on-site interactions. We implement this in an array of three superconducting transmon qubits coupled to a single cavity mode; the transmons represent lattice sites and thei...

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Bibliographic Details
Published in:Physical review letters 2015-12, Vol.115 (24), p.240501-240501, Article 240501
Main Authors: Hacohen-Gourgy, S, Ramasesh, V V, De Grandi, C, Siddiqi, I, Girvin, S M
Format: Article
Language:English
Subjects:
Arrays
Autonomous
Cooling
Entropy
Feedback
Holes
Preserves
Qubits (quantum computing)
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Summary:We engineer a quantum bath that enables entropy and energy exchange with a one-dimensional Bose-Hubbard lattice with attractive on-site interactions. We implement this in an array of three superconducting transmon qubits coupled to a single cavity mode; the transmons represent lattice sites and their excitation quanta embody bosonic particles. Our cooling protocol preserves the particle number-realizing a canonical ensemble-and also affords the efficient preparation of dark states which, due to symmetry, cannot be prepared via coherent drives on the cavity. Furthermore, by applying continuous microwave radiation, we also realize autonomous feedback to indefinitely stabilize particular eigenstates of the array.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.240501