Resolving Fock states near the Kerr-free point of a superconducting resonator
Journal article, 2023
We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement). Such a device possesses a Kerr-free point 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.
Author
Yong Lu
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
University of Stuttgart
Marina Kudra
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Timo Hillmann
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
Jiaying Yang
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Ericsson
Hangxi Li
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Isaac Fernando Quijandria Diaz
Okinawa Institute of Science and Technology Graduate University
Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics
Per Delsing
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
npj Quantum Information
20566387 (eISSN)
Vol. 9 1 114Wallenberg Centre for Quantum Technology (WACQT)
Knut and Alice Wallenberg Foundation (KAW 2017.0449, KAW2021.0009, KAW2022.0006), 2018-01-01 -- 2030-03-31.
Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1038/s41534-023-00782-w