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Switchable Ultrastrong Coupling in Circuit QED

Source: Phys. Rev. Lett. 105, 023601 (2010); doi:10.1103/PhysRevLett.105.023601

Published 6 July 2010

PACS
  • 42.50.-p
    Quantum optics
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 85.25.-j
    Superconducting devices
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
B. Peropadre,1 P. Forn-Díaz,2 E. Solano,3,4 and J. J. García-Ripoll1
1Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain
2Quantum Transport Group, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
3Departamento de Química Física, Universidad del País Vasco—Euskal Herriko Unibertsitatea, Apartado 644, 48080 Bilbao, Spain
4IKERBASQUE, Basque Foundation for Science, Alameda Urquijo 36, 48011 Bilbao, Spain
We propose different designs of switchable coupling between a superconducting flux qubit and a microwave transmission line. They are based on two or more loops of Josephson junctions which are directly connected to a closed (cavity) or open transmission line. In both cases the circuit induces a coupling that can be modulated in strength, reaching the so-called ultrastrong coupling regime in which the coupling is comparable to the qubit and photon frequencies. Furthermore, we suggest a wide set of applications for the introduced architectures. ©2010 The American Physical Society
History: Received 19 January 2010; published 6 July 2010
Permalink: http://link.aps.org/abstract/PRL/v105/e023601
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