Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System

• URL: http://arxiv.org/abs/2007.00255v1
• Date: Wed, 1 Jul 2020 05:28:33 GMT
• Title: Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System
• Authors: Shuai-Peng Wang, Guo-Qiang Zhang, Yimin Wang, Zhen Chen, Tiefu Li, J. S. Tsai, Shi-Yao Zhu, J. Q. You
• Abstract summary: A cavity quantum electrodynamical (QED) system beyond the strong-coupling regime is expected to exhibit intriguing quantum phenomena. We report a direct measurement of the photon-dressed qubit transition frequencies up to four photons by harnessing the same type of state transitions in an ultrastrongly coupled circuit-QED system.
• Score: 4.3957154133979905
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A cavity quantum electrodynamical (QED) system beyond the strong-coupling regime is expected to exhibit intriguing quantum phenomena. Here we report a direct measurement of the photon-dressed qubit transition frequencies up to four photons by harnessing the same type of state transitions in an ultrastrongly coupled circuit-QED system realized by inductively coupling a superconducting flux qubit to a coplanar-waveguide resonator. This demonstrates a convincing observation of the photon-dressed Bloch-Siegert shift in the ultrastrongly coupled quantum system. Moreover, our results show that the photon-dressed Bloch-Siegert shift becomes more pronounced as the photon number increases, which is a characteristic of the quantum Rabi model.

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