Skip to main content
. 2016 Mar 31;6:23786. doi: 10.1038/srep23786

Table 1. Measured TLS parameters.

TLS Δp/2π (GHz) (∂εp/∂V)/2π (MHz/V) V0,p (V) D|| (eÅ) T1 @ εp = 0 (μs) A (μs)−1 B (μs)−1 Γφ,Rφ,E
1 7.075 115.5 −18.01 0.37 0.44 14 7.7 8
2 7.335 180.3 7.64 0.29 0.99 4.4 9.1 17
3 6.947 156.7 24.10 0.26 2 3.3 10.5 22
4 6.217 146.8 38.65 0.46 3.2 0.0 13.3

Static values Δp, ∂εp/∂V and V0,p are obtained from a spectroscopic fit of ω10(V). D is the component of the TLS’ dipole moment parallel to the electric field in the junction, extracted from the measured coupling strength to the qubit. T1 is quoted at the TLS’ symmetry point. Parameters A and B result from fits of the measured dephasing rates in the region |εp|/2π < 1 GHz to the spin-echo dephasing rate Γφ,E = A · (εp/Ep)2 and Ramsey dephasing rate Γφ,R = A · (εp/Ep)2 + B · (|εp|/Ep), respectively. The last column gives the approximate ratio between Ramsey and echo rates, estimated in the region |εp|/2π < 1 GHz.