Dynamical Decoupling and Dephasing in Interacting Two-Level Systems
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Gustavsson-2012-Dynamical Decoupling and Dephasing in.pdf
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Author(s)
Bylander, Jonas
Gustavsson, Simon
Oliver, William D.
Orlando, Terry Philip
Yan, Fei
Nakamura, Yasunobu
Yoshihara, Fumiki
Date Issued
July 2012
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Gustavsson, Simon et al. “Dynamical Decoupling and Dephasing in Interacting Two-Level Systems.” Physical Review Letters 109.1 (2012): 010502. © 2012 American Physical Society.
Version
Final published version
Abstract
We implement dynamical decoupling techniques to mitigate noise and enhance the lifetime of an entangled state that is formed in a superconducting flux qubit coupled to a microscopic two-level system. By rapidly changing the qubit’s transition frequency relative to the two-level system, we realize a refocusing pulse that reduces dephasing due to fluctuations in the transition frequencies, thereby improving the coherence time of the entangled state. The coupling coherence is further enhanced when applying multiple refocusing pulses, in agreement with our 1/f noise model. The results are applicable to any two-qubit system with transverse coupling and they highlight the potential of decoupling techniques for improving two-qubit gate fidelities, an essential prerequisite for implementing fault-tolerant quantum computing.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.109.010502
