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29 March 2024
 
  » pubmed » pmid17358801

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Dephasing of a superconducting flux qubit
K Kakuyanagi ; T Meno ; S Saito ; H Nakano ; K Semba ; H Takayanagi ; F Deppe ; A Shnirman ;
Date 26 Jan 2007
Journal Phys Rev Lett, 98 (4), 047004
AbstractIn order to gain a better understanding of the origin of decoherence in superconducting flux qubits, we have measured the magnetic field dependence of the characteristic energy relaxation time (T(1)) and echo phase relaxation time (T(2)(echo)) near the optimal operating point of a flux qubit. We have measured T(2)(echo) by means of the phase cycling method. At the optimal point, we found the relation T(2)(echo) approximately 2T(1). This means that the echo decay time is limited by the energy relaxation (T(1) process). Moving away from the optimal point, we observe a linear increase of the phase relaxation rate (1/T(2)(echo)) with the applied external magnetic flux. This behavior can be well explained by the influence of magnetic flux noise with a 1/f spectrum on the qubit.
Source PubMed, pmid17358801
Other source [GID 1011221] cond-mat/0609564
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