Vacuum-induced Autler-Townes splitting in a superconducting artificial atom

Z. H. Peng, J. H. Ding, Y. Zhou, L. L. Ying, Z. Wang, L. Zhou, L. M. Kuang, Yu-xi Liu, O. V. Astafiev, and J. S. Tsai

Phys. Rev. A 97, 063809 – Published 7 June 2018

Abstract

We experimentally study a vacuum-induced Autler-Townes doublet in a superconducting three-level artificial atom strongly coupled to a coplanar waveguide resonator and simultaneously to a transmission line. The Autler-Townes splitting is observed in the reflection spectrum from the three-level atom in a transition between the ground state and the second excited state when the transition between the two excited states is resonant with a resonator. By applying a driving field to the resonator, we observe a change in the regime of the Autler-Townes splitting from quantum (vacuum-induced) to classical (with many resonator photons). Furthermore, we show that the reflection of propagating microwaves in a transmission line could be controlled by different frequency microwave fields at the single-photon level in a resonator.

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Received 23 May 2017

DOI:https://doi.org/10.1103/PhysRevA.97.063809

Physics Subject Headings (PhySH)

Coherent control Effects of atomic coherence on light propagation Light-matter interaction Quantum networks Quantum optics

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Z. H. Peng^1,2,*, J. H. Ding³, Y. Zhou⁴, L. L. Ying⁵, Z. Wang⁵, L. Zhou¹, L. M. Kuang¹, Yu-xi Liu^3,6,†, O. V. Astafiev^7,8,9,‡, and J. S. Tsai^4,2

¹Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
²Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan
³Institute of Microelectronics, Tsinghua University, Beijing 100084, China
⁴Department of Physics, Tokyo University of Science, Kagurazaka, Tokyo 162-8601, Japan
⁵Center for Excellence in Superconducting Electronics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
⁶Beijing National Research Center for Information Science and Technology, Beijing 100084, China
⁷Physics Department, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
⁸National Physical Laboratory, Teddington, TW11 0LW, United Kingdom
⁹Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia

^*zhihui.peng@hunnu.edu.cn
^†yuxiliu@mail.tsinghua.edu.cn
^‡Oleg.astafiev@rhul.ac.uk

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Issue

Vol. 97, Iss. 6 — June 2018

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