Coherence and Decay of Higher Energy Levels of a Superconducting Transmon Qubit
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PhysRevLett.114.010501.pdf
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675.35 KB
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Checksum (MD5)
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Author(s)
Peterer, Michael J.
Bader, Samuel J.
Jin, Xiaoyue
Yan, Fei
Kamal, Archana
Gudmundsen, Theodore J.
Leek, Peter J.
Oliver, William D.
Gustavsson, Simon
Orlando, Terry Philip
Date Issued
January 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Peterer, Michael J., Samuel J. Bader, Xiaoyue Jin, Fei Yan, Archana Kamal, Theodore J. Gudmundsen, Peter J. Leek, Terry P. Orlando, William D. Oliver, and Simon Gustavsson. “Coherence and Decay of Higher Energy Levels of a Superconducting Transmon Qubit.” Physical Review Letters 114, no. 1 (January 2015). © 2015 American Physical Society
Version
Final published version
Abstract
We present measurements of coherence and successive decay dynamics of higher energy levels of a superconducting transmon qubit. By applying consecutive π pulses for each sequential transition frequency, we excite the qubit from the ground state up to its fourth excited level and characterize the decay and coherence of each state. We find the decay to proceed mainly sequentially, with relaxation times in excess of 20 μs for all transitions. We also provide a direct measurement of the charge dispersion of these levels by analyzing beating patterns in Ramsey fringes. The results demonstrate the feasibility of using higher levels in transmon qubits for encoding quantum information.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.114.010501
