Resolving Fock states near the Kerr-free point of a superconducting resonator

We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement). Such a device possesses a sweet spot in which the external magnetic flux allows to suppress the Kerr interaction. We have excited photons near this Kerr-free point and chara...

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Bibliographic Details
Published in:arXiv.org 2022-10
Main Authors: Lu, Yong, Kudra, Marina, Hillmann, Timo, Yang, Jiaying, Li, Hangxi, Quijandría, Fernando, Delsing, Per
Format: Article
Language:English
Subjects:
Continuity (mathematics)
Couplings
Excitation spectra
Fock state
Magnetic flux
Photons
Qubits (quantum computing)
Resonators
Superconductivity
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Summary:We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement). Such a device possesses a sweet spot in which the external magnetic flux allows to suppress the Kerr interaction. We have excited photons near this Kerr-free point and characterized the device using a transmon qubit. The excitation spectrum of the qubit allows to observe photon-number-dependent frequency shifts about nine times larger than the qubit linewidth. Our study demonstrates a compact integrated platform for continuous-variable quantum processing that combines large couplings, considerable relaxation times and excellent control over the photon mode structure in the microwave domain.
ISSN:2331-8422