Dynamical decoupling and dephasing in interacting two-level systems
Artikel i vetenskaplig tidskrift, 2012

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. © 2012 American Physical Society.


S. Gustavsson

Massachusetts Institute of Technology (MIT)

F. Yan

Massachusetts Institute of Technology (MIT)

Jonas Bylander

Massachusetts Institute of Technology (MIT)

F. Yoshihara


Y. Nakamura

University of Tokyo


NEC Laboratories Europe GmbH

T.P. Orlando

Massachusetts Institute of Technology (MIT)

W.D. Oliver

Massachusetts Institute of Technology (MIT)

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 109 1 010502-


Atom- och molekylfysik och optik


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