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dc.contributor.authorSiyuan, Han
dc.contributor.authorZhao, S.P.
dc.contributor.authorLiu, W.Y.
dc.contributor.authorXu, H.K.
dc.contributor.authorSu, F.F.
dc.contributor.authorLi, Z.Y.
dc.contributor.authorTian, Ye
dc.identifier.citationPhysRevB.97.094513, Coupled superconducting qudit-resonator system: Energy spectrum, state population, and state transition under microwave drive Liu, W. Y. and Xu, H. K. and Su, F. F. and Li, Z. Y. and Tian, Ye and Han, Siyuan and Zhao, S. P. Phys. Rev. B 97;9 10.1103/PhysRevB.97.094513en_US
dc.description.abstractSuperconducting quantum multilevel systems coupled to resonators have recently been considered in some applications such as microwave lasing and high-fidelity quantum logical gates. In this work, using an rf-SQUID type phase qudit coupled to a microwave coplanar waveguide resonator, we study both theoretically and experimentally the energy spectrum of the system when the qudit level spacings are varied around the resonator frequency by changing the magnetic flux applied to the qudit loop. We show that the experimental result can be well described by a theoretical model that extends from the usual two-level Jaynes-Cummings system to the present four-level system. It is also shown that due to the small anharmonicity of the phase device a simplified model capturing the leading state interactions fits the experimental spectra very well. Furthermore we use the Lindblad master equation containing various relaxation and dephasing processes to calculate the level populations in the simpler qutrit-resonator system, which allows a clear understanding of the dynamics of the system under the microwave drive. Our results help to better understand and perform the experiments of coupled multilevel and resonator systems and can be applied in the case of transmon or Xmon qudits having similar anharmonicity to the present phase device.en_US
dc.description.sponsorshipThis work was supported by the Ministry of Science and Technology of China (Grants No. 2014CB921202, No. 2015CB921104, and No. 2016YFA0300601),en_US
dc.description.sponsorshipthe National Natural Science Foundation of China (Grants No. 91321208 and No. 11674380)en_US
dc.description.sponsorshipthe Key Research Program of the Chinese Academy of Sciences (Grant No. XDPB08-3)en_US
dc.description.sponsorshipS.H. acknowledges support by the US NSF (PHY-1314861).en_US
dc.publisherAmerican Physical Societyen_US
dc.rights©2018 American Physical Societyen_US
dc.titleCoupled superconducting qudit-resonator system: Energy spectrum, state population, and state transition under microwave driveen_US
kusw.kuauthorHan, Siyuan
kusw.kudepartmentPhysics and Astronomyen_US
kusw.oaversionScholarly/refereed, author accepted manuscripten_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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