Tunable resonant and nonresonant interactions between a phase qubit and LC resonator

We use a flux-biased radio frequency superconducting quantum interference device (rf SQUID) with an embedded flux-biased direct current SQUID to generate strong resonant and nonresonant tunable interactions between a phase qubit and a lumped-element resonator. The rf SQUID creates a tunable magnetic...

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Bibliographic Details
Published in:Physical review letters 2014-03, Vol.112 (12), p.123601-123601
Main Authors: Allman, M S, Whittaker, J D, Castellanos-Beltran, M, Cicak, K, da Silva, F, DeFeo, M P, Lecocq, F, Sirois, A, Teufel, J D, Aumentado, J, Simmonds, R W
Format: Article
Language:English
Subjects:
Joining
Magnetic permeability
Magnetic susceptibility
Nonlinearity
Qubits (quantum computing)
Resonators
SQUIDs
Superconducting quantum interference devices
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Summary:We use a flux-biased radio frequency superconducting quantum interference device (rf SQUID) with an embedded flux-biased direct current SQUID to generate strong resonant and nonresonant tunable interactions between a phase qubit and a lumped-element resonator. The rf SQUID creates a tunable magnetic susceptibility between the qubit and resonator providing resonant coupling strengths from zero to near the ultrastrong coupling regime. By modulating the magnetic susceptibility, nonresonant parametric coupling achieves rates >100  MHz. Nonlinearity of the magnetic susceptibility also leads to parametric coupling at the subharmonics of the qubit-resonator detuning.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.112.123601