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APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 9
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Phys. Rev. Lett. 94, 090501 (2005) [4 pages]

Spectroscopy on Two Coupled Superconducting Flux Qubits

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J. B. Majer*, F. G. Paauw, A. C. J. ter Haar, C. J. P. M. Harmans, and J. E. Mooij
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

Received 10 August 2003; revised 2 March 2004; published 9 March 2005

We have performed spectroscopy measurements on two coupled flux qubits. The qubits are coupled inductively, which results in a σ1zσ2z interaction. By applying microwave radiation, we observe resonances due to transitions from the ground state to the first two excited states. From the position of these resonances as a function of the applied magnetic field, we observe the coupling of the qubits. The coupling strength agrees with calculations of the mutual inductance.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.090501
DOI:
10.1103/PhysRevLett.94.090501
PACS:
03.67.Lx, 74.50.+r, 85.25.Cp

*Present Address: Department of Applied Physics, Yale University, New Haven, CT 06511, USA.

 
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