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Applied Physics Letters / Volume 99 / Issue 26 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 99, 262502 (2011); http://dx.doi.org/10.1063/1.3672000 (3 pages)

Coherence in a transmon qubit with epitaxial tunnel junctions

Martin P. Weides1, Jeffrey S. Kline1, Michael R. Vissers1, Martin O. Sandberg1, David S. Wisbey1, Blake R. Johnson2, Thomas A. Ohki2, and David P. Pappas1

1National Institute of Standards and Technology, Boulder, Colorado 80305, USA
2Raytheon BBN Technologies, Cambridge, Massachusetts 02138, USA

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(Received 15 September 2011; accepted 1 December 2011; published online 27 December 2011)

We developed transmon qubits based on epitaxial tunnel junctions and interdigitated capacitors. This multileveled qubit, patterned by use of all-optical lithography, is a step towards scalable qubits with a high integration density. The relaxation time T1 is 0.72−0.86 μs and the ensemble dephasing time T2* is slightly larger than T1. The dephasing time T2 (1.36 μs) is nearly energy-relaxation-limited. Qubit spectroscopy yields weaker level splitting than observed in qubits with amorphous barriers in equivalent-size junctions. The qubit’s inferred microwave loss closely matches the weighted losses of the individual elements (junction, wiring dielectric, and interdigitated capacitor), determined by independent resonator measurements.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

capacitors, photolithography

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3672000

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. Koch, T. M. Yu, J. Gambetta, A. A. Houck, D. I. Schuster, J. Majer, A. Blais, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf, Phys. Rev. A 76, 042319 (2007).

    R. Vijay, D. H. Slichter, and I. Siddiqi, Phys. Rev. Lett. 106, 110502 (2011).

    S. Oh, K. Cicak, J. S. Kline, M. A. Sillanpää, K. D. Osborn, J. D. Whittaker, R. W. Simmonds, and D. P. Pappas, Phys. Rev. B 74, 100502 (2006).

    A. D. Córcoles, J. M. Chow, J. M. Gambetta, C. Rigetti, J. R. Rozen, G. A. Keefe, M. B. Rothwell, M. B. Ketchen, and M. Steffen, Appl. Phys. Lett. 99, 181906 (2001)APPLAB000099000018181906000001.


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