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

• URL: http://arxiv.org/abs/2210.09718v1
• Date: Tue, 18 Oct 2022 09:55:58 GMT
• Title: Resolving Fock states near the Kerr-free point of a superconducting resonator
• Authors: Yong Lu, Marina Kudra, Timo Hillmann, Jiaying Yang, Hangxi Li, Fernando Quijandr\'ia, Per Delsing
• Abstract summary: We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement) We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
• Score: 51.03394077656548
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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