Improved superconducting qubit coherence using titanium nitride

J. Chang; M. R. Vissers; A. D. Corcoles; M. Sandberg; J. Gao; David W. Abraham; Jerry M. Chow; Jay M. Gambetta; M. B. Rothwell; G. A. Keefe; Matthias Steffen; D. P. Pappas

doi:10.1063/1.4813269

Improved superconducting qubit coherence using titanium nitride

Quantum Physics 2013-08-16 v1 Mesoscale and Nanoscale Physics Superconductivity

Authors: J. Chang , M. R. Vissers , A. D. Corcoles , M. Sandberg , J. Gao , David W. Abraham , Jerry M. Chow , Jay M. Gambetta , M. B. Rothwell , G. A. Keefe , Matthias Steffen , D. P. Pappas

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Abstract

We demonstrate enhanced relaxation and dephasing times of transmon qubits, up to ~ 60 \mu s by fabricating the interdigitated shunting capacitors using titanium nitride (TiN). Compared to lift-off aluminum deposited simultaneously with the Josephson junction, this represents as much as a six-fold improvement and provides evidence that previous planar transmon coherence times are limited by surface losses from two-level system (TLS) defects residing at or near interfaces. Concurrently, we observe an anomalous temperature dependent frequency shift of TiN resonators which is inconsistent with the predicted TLS model.

Keywords

superconducting radio frequency cavities superconducting qubits high quality factor resonators

Cite

@article{arxiv.1303.4071,
  title  = {Improved superconducting qubit coherence using titanium nitride},
  author = {J. Chang and M. R. Vissers and A. D. Corcoles and M. Sandberg and J. Gao and David W. Abraham and Jerry M. Chow and Jay M. Gambetta and M. B. Rothwell and G. A. Keefe and Matthias Steffen and D. P. Pappas},
  journal= {arXiv preprint arXiv:1303.4071},
  year   = {2013}
}

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Improved superconducting qubit coherence using titanium nitride

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