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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: |
22 Sep 2006 | | Subject: | Superconductivity | | Abstract: | In 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 ($T_2^{
m echo}$) near the optimal operating point of a flux qubit. We have measured $T_2^{
m echo}$ by means of the phase cycling method. At the optimal point, we found the relation $T_2^{
m echo}approx 2T_1$. This means that the echo decay time is {it limited by the energy relaxation} ($T_1$ process). Moving away from the optimal point, we observe a {it linear} increase of the phase relaxation rate ($1/T_{2}^{
m echo}$) 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: | arXiv, cond-mat/0609564 | | Other source: | [GID 1011221] pmid17358801 | | Services: | Forum | Review | PDF | Favorites | |
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