scholarly journals An analysis method for transmission measurements of superconducting resonators with applications to quantum-regime dielectric-loss measurements

2013 ◽  
Vol 114 (5) ◽  
pp. 054504 ◽  
Author(s):  
Chunqing Deng ◽  
Martin Otto ◽  
Adrian Lupascu
Keyword(s):  
Dielectric Loss ◽  
Analysis Method ◽  
Superconducting Resonators ◽  
Quantum Regime ◽  
Transmission Measurements

Sparse Representation Based Dielectric Loss Angle Measurement

2015 ◽  
Vol 9 (1) ◽  
pp. 566-570
Author(s):  
Zhang Ji ◽  
Jianfeng Zheng
Keyword(s):  
Dielectric Loss ◽  
Power Systems ◽  
Sparse Representation ◽  
Precise Measurement ◽  
Angle Measurement ◽  
Measuring Error ◽  
Loss Angle ◽  
Analysis Method ◽  
Electric Capacity ◽  
Dielectric Loss Angle

Precise measurement of dielectric loss angle is very important for electric capacity equipment in recent power systems. When signal-to-noise is low and fundamental frequency is fluctuating, aiming at the measuring error of dielectric loss angle based on some recent Fourier transform and wavelet transform harmonics analysis method, we propose a novel algorithm based on sparse representation, and improved it to be more flexible for signal sampling. Comparison experiments describe the advantages of our method.

Measurement of Dielectric Loss Angle Based on Wavelet Threshold Denoising and Least Squares

2012 ◽  
Vol 220-223 ◽  
pp. 2160-2164
Author(s):  
Hai Wen Chen ◽  
Fu Jiang Mo
Keyword(s):  
Dielectric Loss ◽  
White Noise ◽  
Harmonic Analysis ◽  
Least Squares ◽  
Least Square ◽  
Fundamental Wave ◽  
Loss Angle ◽  
Analysis Method ◽  
Dielectric Loss Angle ◽  
Harmonic Analysis Method

Dielectric loss angle is the effective means to determine the status of the high voltage equipment.Influenced by power grid frequency fluctuation and white noise, the measurement accuracy of traditional method of dielectric loss angle such as harmonic analysis method, cannot meet the demand.A new methodbased on wavelet threshold denoising and least squares is presented in this paper. Firstly, harmonic wave and white noise are eliminated by improved wavelet thresholddenoising, Second, the fundamental wave of voltage and current signal is extracted by mean of least square method, then we can get dielectric loss angle.Simulation and calculation are validated in the different values of frequency fluxion and whtie noise.Comparing with harmonic analysis method,the result show the feasibility and effectiveness of this method.

Dielectric Loss Measurement Method based on the Energy Moment and Quasi-Periodic Interpolation

2013 ◽  
Vol 718-720 ◽  
pp. 650-656
Author(s):  
Yun Peng Liu ◽  
Jun Qiang Zhang ◽  
Zhi Ming Su ◽  
Tao Zhao
Keyword(s):  
Dielectric Loss ◽  
Measurement Accuracy ◽  
Sampling Rate ◽  
Analysis Method ◽  
Method Of Calculation ◽  
Synchronous Sampling ◽  
Improve Measurement ◽  
Harmonic Analysis Method ◽  
Harmonic Proportion ◽  
The Impact

Harmonic analysis method for measurement of dielectric loss, due to the impact of fluctuations in grid frequency and higher harmonics, it is difficult to do the synchronous sampling, which reduces the accuracy of the measurements (especially the phase).In order to improve measurement accuracy, this paper presents a new method of calculation based on the energy moment of quasi-periodic interpolation algorithm. First, using a high frequency to sample the original signal, and then using the energy moment balance theory accurately measure the fundamental frequency, further calculating the integral period sampling rate and integral period samples, and last making integral period re-sampling and FFT calculation after interpolation. The simulation results show that this algorithm is high accuracy, good stability, less affected by the frequency fluctuation, harmonic proportion and initial phase.

scholarly journals Dynamical decoupling of quantum two-level systems by coherent multiple Landau–Zener transitions

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Shlomi Matityahu ◽  
Hartmut Schmidt ◽  
Alexander Bilmes ◽  
Alexander Shnirman ◽  
Georg Weiss ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Single Photon ◽  
Intrinsic Value ◽  
Bias Field ◽  
Quantum Circuits ◽  
Periodic Pattern ◽  
Superconducting Resonators ◽  
Highly Sensitive ◽  
Two Level Systems ◽  
Temperature Radiation

AbstractIncreasing and stabilizing the coherence of superconducting quantum circuits and resonators is of utmost importance for various technologies, ranging from quantum information processors to highly sensitive detectors of low-temperature radiation in astrophysics. A major source of noise in such devices is a bath of quantum two-level systems (TLSs) with broad distribution of energies, existing in disordered dielectrics and on surfaces. Here we study the dielectric loss of superconducting resonators in the presence of a periodic electric bias field, which sweeps near-resonant TLSs in and out of resonance with the resonator, resulting in a periodic pattern of Landau–Zener transitions. We show that at high sweep rates compared to the TLS relaxation rate, the coherent evolution of the TLS over multiple transitions yields a significant reduction in the dielectric loss relative to the intrinsic value. This behavior is observed both in the classical high-power regime and in the quantum single-photon regime, possibly suggesting a viable technique to dynamically decouple TLSs from a qubit.

scholarly journals Comparison of dielectric loss in titanium nitride and aluminum superconducting resonators

2020 ◽  
Vol 117 (12) ◽  
pp. 124004
Author(s):  
A. Melville ◽  
G. Calusine ◽  
W. Woods ◽  
K. Serniak ◽  
E. Golden ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Titanium Nitride ◽  
Superconducting Resonators
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