scholarly journals Auto- versus Cross-Correlation Noise in Periodically Driven Quantum Coherent Conductors

Entropy ◽  
2021 ◽  
Vol 23 (4) ◽  
pp. 393
Author(s):  
Michael Moskalets
Keyword(s):  
Wave Packet ◽  
Shot Noise ◽  
Cross Correlation ◽  
Current Fluctuations ◽  
Majorana Fermions ◽  
Electron Hole ◽  
Periodically Driven ◽  
Back Scattering ◽  
Correlation Noise ◽  
Insight Into

Expressing currents and their fluctuations at the terminals of a multi-probe conductor in terms of the wave functions of carriers injected into the Fermi sea provides new insight into the physics of electric currents. This approach helps us to identify two physically different contributions to shot noise. In the quantum coherent regime, when current is carried by non-overlapping wave packets, the product of current fluctuations in different leads, the cross-correlation noise, is determined solely by the duration of the wave packet. In contrast, the square of the current fluctuations in one lead, the autocorrelation noise, is additionally determined by the coherence of the wave packet, which is associated with the spread of the wave packet in energy. The two contributions can be addressed separately in the weak back-scattering regime, when the autocorrelation noise depends only on the coherence. Analysis of shot noise in terms of these contributions allows us, in particular, to predict that no individual traveling particles with a real wave function, such as Majorana fermions, can be created in the Fermi sea in a clean manner, that is, without accompanying electron–hole pairs.

Correlational Methods for Analysis of Dance Movements

2011 ◽  
Vol 29 (supplement) ◽  
pp. 283-304 ◽  
Author(s):  
Timothy R. Brick ◽  
Steven M. Boker
Keyword(s):  
Motion Capture ◽  
Mirror Symmetry ◽  
Cross Correlation ◽  
The Other ◽  
Free Form ◽  
Motion Capture Data ◽  
Complex Interactions ◽  
Dance Movements ◽  
Time Lagged ◽  
Insight Into

Among the qualities that distinguish dance from other types of human behavior and interaction are the creation and breaking of synchrony and symmetry. The combination of symmetry and synchrony can provide complex interactions. For example, two dancers might make very different movements, slowing each time the other sped up: a mirror symmetry of velocity. Examining patterns of synchrony and symmetry can provide insight into both the artistic nature of the dance, and the nature of the perceptions and responses of the dancers. However, such complex symmetries are often difficult to quantify. This paper presents three methods – Generalized Local Linear Approximation, Time-lagged Autocorrelation, and Windowed Cross-correlation – for the exploration of symmetry and synchrony in motion-capture data as is it applied to dance and illustrate these with examples from a study of free-form dance. Combined, these techniques provide powerful tools for the examination of the structure of symmetry and synchrony in dance.

Radon Transform Removes Correlation Noise Produced by Vibroseis

2014 ◽  
Vol 672-674 ◽  
pp. 1964-1967
Author(s):  
Jun Qiu Wang ◽  
Jun Lin ◽  
Xiang Bo Gong
Keyword(s):  
Radon Transform ◽  
Seismic Data ◽  
Cross Correlation ◽  
Random Noise ◽  
Seismic Record ◽  
Electromagnetic Drive ◽  
Seismic Records ◽  
Correlation Noise

Vibroseis obtained the seismic record by cross-correlation detection calculation. compared with dynamite source, cross-correlation detection can suppress random noise, but produce more correlation noise. This paper studies Radon transform to remove correlation noise produced by electromagnetic drive vibroseis and impact rammer. From the results of processing field seismic records, we can see that Radon transform can remove correlation noise by vibroseis, the SNR of vibroseis seismic data is effectively improved.

Simulative Analysis of a Family of DNA Tetrahedrons Produced by Changing the Twisting Number of Each Double Helix

2021 ◽  
Vol 20 (05) ◽  
pp. 529-537
Author(s):  
Hui Bai ◽  
Jia Li ◽  
Heng Zhang ◽  
Shuya Liu
Keyword(s):  
Cross Correlation ◽  
Double Helix ◽  
Dynamics Simulation ◽  
Conformational Variability ◽  
Double Helices ◽  
Dna Tetrahedron ◽  
Entire Trajectory ◽  
Dna Double Helix ◽  
Twist Number ◽  
Insight Into

In this paper, three tetrahedral nanocages, composed of six DNA double helix edges with all having the twist number 1, 2 or 3, have been characterized using classical molecular dynamics simulation to measure the specific structural and conformational features produced by only changing the twisting number of each double helix. The simulation result indicates that three tetrahedral cages are relatively stable and are maintained along the entire trajectory. Each double helix is more inclined to behave as a whole in the 2TD and 3TD cages than in the 1TD cage according to the cross-correlation maps for three nanocages, and also their local motions are more easily induced by the conformational variability of the thymidine linkers due to the increased flexibility of each helix. Hence, the double helices become the important factors on the structural stability of total cages with the DNA twisting number, and also give the signification contributions to the sizes of these cages conferring the larger spaces of the 2TD and 3TD cages than the 1TD cage. Our result provides an insight into which roles the double helix edges play in assembling DNA polyhedron, and also contribute to improving the loading capacity of DNA tetrahedron in drug delivery.

scholarly journals Mobility of Histidine Side Chains Analyzed with 15N NMR Relaxation and Cross-Correlation Data: Insight into Zinc-Finger–DNA Interactions

2019 ◽  
Vol 123 (17) ◽  
pp. 3706-3710
Author(s):  
Catherine A. Kemme ◽  
Ross H. Luu ◽  
Chuanying Chen ◽  
Channing C. Pletka ◽  
B. Montgomery Pettitt ◽  
...  
Keyword(s):  
Zinc Finger ◽  
Cross Correlation ◽  
Nmr Relaxation ◽  
15N Nmr ◽  
Side Chains ◽  
Dna Interactions ◽  
15N Nmr Relaxation ◽  
Correlation Data ◽  
Insight Into

scholarly journals Generation and Characterization of Mid-Infrared Supercontinuum in Bulk YAG Pumped by Femtosecond 1937 nm Pulses from a Regenerative Amplifier

2019 ◽  
Vol 9 (16) ◽  
pp. 3399 ◽  
Author(s):  
Seyed Ali Rezvani ◽  
Yutaka Nomura ◽  
Takao Fuji
Keyword(s):  
Pump Pulse ◽  
Phase Modulation ◽  
Cross Correlation ◽  
Seed Pulse ◽  
Regenerative Amplifier ◽  
Mid Infrared ◽  
Optical Gating ◽  
Full Characterization ◽  
Insight Into

We have demonstrated the generation of supercontinuum (SC) pulses in bulk, using femtosecond pulses directly derived from a Tm:YAP regenerative amplifier. The SC spans from 380 nm–4 μ m. Such an SC combined with the applied 1937-nm pump pulse can be used in a mid-infrared optical parametric amplifier (MIR-OPA). A full characterization of the phase and stability of the SC provides important insight into the performance of such MIR-OPA systems. Using cross-correlation frequency-resolved optical gating (XFROG), we characterized the properties of the MIR section of the SC that can be used as a seed pulse in an MIR-OPA system. The pulse-to-pulse instability rooted in the intrinsic properties of the self-phase modulation process was observed in the retrieved trace and spectrum of the SC. In addition, the effect of the pump pulse quality was studied on the obtainable SC pulses.

scholarly journals The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Petr Sedlak ◽  
Adam Gajdos ◽  
Robert Macku ◽  
Jiri Majzner ◽  
Vladimir Holcman ◽  
...  
Keyword(s):  
Experimental Study ◽  
Ionic Liquid ◽  
Thermal Treatment ◽  
Polymer Electrolyte ◽  
Polymer Matrix ◽  
Shot Noise ◽  
Solid Polymer Electrolyte ◽  
Evaporation Rate ◽  
Solid Polymer ◽  
Current Fluctuations

AbstractThe experimental study deals with the investigation of the effect of diverse crystallinity of imidazolium ionic-liquid-based SPE on conductivity and current fluctuations. The experimental study was carried out on samples consisting of [EMIM][TFSI] as ionic liquid, PVDF as a polymer matrix and NMP as a solvent. After the deposition, the particular sample was kept at an appropriate temperature for a specific time in order to achieve different crystalline forms of the polymer in the solvent, since the solvent evaporation rate controls crystallization. The ac/dc conductivities of SPEs were investigated across a range of temperatures using broadband dielectric spectroscopy in terms of electrical conductivity. In SPE samples of the higher solvent evaporation rate, the real parts of conductivity spectra exhibit a sharper transition during sample cooling and an increase of overall conductivity, which is implied by a growing fraction of the amorphous phase in the polymer matrix in which the ionic liquid is immobilized. The conductivity master curves illustrate that the changing of SPEs morphology is reflected in the low frequency regions governed by the electrode polarization effect. The dc conductivity of SPEs exhibits Vogel–Fulcher–Tammann temperature dependence and increases with the intensity of thermal treatment. Spectral densities of current fluctuations showed that flicker noise, thermal noise and shot noise seems to be major noise sources in all samples. The increase of electrolyte conductivity causes a decrease in bulk resistance and partially a decrease in charge transfer resistance, while also resulting in an increase in shot noise. However, the change of electrode material results in a more significant change of spectral density of current fluctuations than the modification of the preparation condition of the solid polymer electrolyte. Thus, the contact noise is considered to contribute to overall current fluctuations across the samples.

Cross-correlation measurement of quantum shot noise using homemade transimpedance amplifiers

2014 ◽  
Vol 85 (5) ◽  
pp. 054704 ◽  
Author(s):  
Masayuki Hashisaka ◽  
Tomoaki Ota ◽  
Masakazu Yamagishi ◽  
Toshimasa Fujisawa ◽  
Koji Muraki
Keyword(s):  
Shot Noise ◽  
Cross Correlation ◽  
Correlation Measurement ◽  
Transimpedance Amplifiers
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