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  Probing the Tavis-Cummings level splitting with intermediate-scale superconducting circuits

Yang, P., Brehm, J. D., Leppäkangas, J., Guo, L., Marthaler, M., Boventer, I., et al. (2020). Probing the Tavis-Cummings level splitting with intermediate-scale superconducting circuits. Physical Review Applied, (14): 024025. doi:10.1103/PhysRevApplied.14.024025.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-4FAD-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-EE47-F
Genre: Journal Article

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 Creators:
Yang, Ping1, Author
Brehm, Jan David1, Author
Leppäkangas, Juha1, 2, Author
Guo, Lingzhen3, Author              
Marthaler, Michael2, 4, 5, Author
Boventer, Isabella1, 6, Author
Stehli, Alexander1, Author
Wolz, Tim1, Author
Ustinov, Alexey V.1, 7, Author
Weides, Martin1, 8, Author
Affiliations:
1Institute of Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, DE, ou_persistent22              
2HQS Quantum Simulations GmbH, 76131 Karlsruhe, DE, ou_persistent22              
3Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_2421700              
4Institute for Theoretical Condensed Matter Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, DE, ou_persistent22              
5Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, DE, ou_persistent22              
6Institute of Physics, University Mainz, 55128 Mainz, DE, ou_persistent22              
7Russian Quantum Center, National University of Science and Technology MISIS, Moscow 119049, Russia, ou_persistent22              
8School of Engineering, University of Glasgow, Glasgow G12 8QQ, United Kingdom, ou_persistent22              

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 Abstract: We demonstrate the local control of up to eight two-level systems interacting strongly with a microwave cavity. Following calibration, the frequency of each individual two-level system (qubit) is tunable without influencing the others. Bringing the qubits one by one on resonance with the cavity, we observe the collective coupling strength of the qubit ensemble. The splitting scales up with the square root of the number of the qubits, being the hallmark of the Tavis-Cummings model. The local control circuitry causes a bypass shunting the resonator, and a Fano interference in the microwave readout, whose contribution can be calibrated away to recover the pure cavity spectrum. The simulator's attainable size of dressed states is limited by reduced signal visibility, and -if uncalibrated- by off-resonance shifts of sub-components. Our work demonstrates control and readout of quantum coherent mesoscopic multi-qubit system of intermediate scale under conditions of noise.

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Language(s): eng - English
 Dates: 2020-08-11
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevApplied.14.024025
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Title: Physical Review Applied
  Abbreviation : Phys. Rev. Appl.
Source Genre: Journal
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Publ. Info: College Park, Md. [u.a.] : American Physical Society
Pages: - Volume / Issue: (14) Sequence Number: 024025 Start / End Page: - Identifier: ISSN: 2331-7019
CoNE: https://pure.mpg.de/cone/journals/resource/2331-7019