23 papers · ranked by Valyu relevance
Nan Wang, Daniel Abraham, Zachary Shah, Yimeng Lin + 15 more
To develop a Field-Correcting GRAPPA (FCG) technique to correct the spatiotemporal-varying phase errors in EPI caused by eddy currents. The fast-changing gradient in EPI causes strong eddy current effects and associated spatiotemporal-varying phase errors, producing significant image artifacts. The use of higher…
Huakun Li, Bingyao Tan, Vimal Prabhu Pandiyan, Veluchamy Amutha Barathi + 3 more
Phase-sensitive Fourier-domain optical coherence tomography (FD-OCT) enables in-vivo, label- free imaging of cellular movements with detection sensitivity down to the nanometer scale, and it is widely employed in emerging functional imaging modalities, such as optoretinography (ORG), Doppler OCT, and optical coherence…
Zhuang Lv, Kaifeng Zhu, Xin He, Lei Zhang + 6 more
'Jun Wang' 'Xin Zhang' 'Ruidong Hao' 'Robert Sitnik'] Fringe projection profilometry (FPP) is prone to phase unwrapping error (PUE) due to phase noise and measurement conditions. Most of the existing PUE-correction methods detect and correct PUE on a pixel-by-pixel or partitioned block basis and do not make full use of…
Xinyu Huang, Deshun Huang, Bingbing Chen, Bo Wu + 1 more
This paper proposes a closed-loop iterative automatic initial phase calibration scheme. Under the condition that the direction of the calibration source and the signal frequency are known, the complex readback data of all array elements are obtained. The theoretical phase of each array element is calculated in advance…
Alexander Schultze, Dennis Weise, Alexander Sell, Claus Braxmaier
The delay of photodetectors can be affected by intensity, reverse bias, and temperature through different effects. An optical pilot tone superimposed on the detectors allows the independent measurement of such phase errors in the complete photodetection chain and provides an opportunity to correct them. This allows…
Goran T. Djordjevic, Dejan N. Milic, Bata Vasic, Jarosław Makal + 2 more
'Bane Vasic' 'Syed A. Jafar'] We examine the effects of imperfect phase estimation of a reference signal on the bit error rate and mutual information over a communication channel influenced by fading and thermal noise. The Two-Wave Diffuse-Power (TWDP) model is utilized for statistical characterization of propagation…
Tom Denecker, Y. Chew, Oscar Guillemant, G Watanabe + 3 more
lasers Authors: ['Tom Denecker' 'Y. Chew' 'Oscar Guillemant' 'G Watanabe' 'Takafumi Tomita' 'Kenji Ohmori' 'Sylvain de Léséleuc'] Lasers are the workhorse of quantum engineering in the atomic-molecular-optic community. However, phase noise of the laser, which can be especially large in popular semiconductor-based…
Xingfan Chen, Qican Zhang, Yajun Wang, Pengpeng Hu + 3 more
In three-dimensional (3D) measurement, the motion of objects inevitably introduces errors, posing significant challenges to high-precision 3D reconstruction. Most existing algorithms for compensating motion-induced phase errors are tailored for object motion along the camera’s principal axis (Z direction), limiting…
Lutz Rapp
Existing unrepeatered submarine links are increasingly upgraded to the most advanced modulation format currently available for commercial applications. Quite often the use of third–order codirectional Raman amplifiers is necessary. Power fluctuations of the involved high–power pump induces phase shifts in phase…
Jean P. Elbers, David Horner, Tamara Löwenstern, Franco Laccone
Methods for sequence error correction can improve sequence accuracy; however, there can be unintended errors added during error correction. One such example is phase switching, whereby sequences derived from genomes containing more than one parental copy have contributions from more than one parental haplotype. Such…
Daniel Ruiz Garcia, Mario R. Hueda
Decision-directed (DD) carrier phase recovery (CPR) [ 2] and the blind phase search (BPS) algorithm [ 3] have been widely used in optical coherent receivers to compensate the impact of laser phase noise. The two-stage CPR scheme based on a DD low latency parallel phase locked loop (DD-PLL) followed by a feedforward CPR…
Yongyi Cai, Eryk Druszkiewicz, Sara S. Patterson, Keith Parkins + 4 more
The quality of retinal images is compromised by aberrations that remain uncorrected even in confocal adaptive optics imaging. This study demonstrates phase diversity (PD), a computational imaging technique, to address residual aberrations and enhance image quality in adaptive optics scanning laser ophthalmoscopy…
Courtney Johnson, Min Guo, Magdalena C. Schneider, Yijun Su + 5 more
Fluorescence microscopy is an invaluable tool in biology, yet its performance is compromised when the wavefront of light is distorted due to optical imperfections or the refractile nature of the sample. Such optical aberrations can dramatically lower the information content of images by degrading image contrast…
Qun Li, Jian Shao, Peng Wu, Jiabi Liang + 5 more
To address the issues of quadrature component attenuation and signal-to-noise ratio (SNR) degradation caused by carrier phase delay in Phase-Generated Carrier (PGC) demodulation, this paper proposes a phase delay compensation method based on sampling-point shift pre-calibration. By establishing a discrete phase offset…
Authors not listed
This work provides a rigorous theoretical investigation of selective error correction strategies for variational quantum algorithms, with focus on understanding the interplay between error suppression, circuit trainability, and computational resource requirements. We develop a mathematical framework that characterizes…
Hanzi Huang, Haoshuo Chen, Qi Gao, Yetian Huang + 6 more
'Nicolas K. Fontaine' 'Mikael Mazur' 'Lauren Dallachiesa' 'Roland Ryf' 'Zhengxuan Li' 'Yingxiong Song'] Abstract—We experimentally investigate transmitting highorder quadrature amplitude modulation (QAM) signals with carrierless and intensity-only measurements with phase retrieval (PR) receiving techniques. The…
Xavier Attendu, Dirk J. Faber, Guy Lamouche, Ton G. van Leeuwen + 2 more
'Caroline Boudoux' 'Maxime Rivard'] Title: Abstract. Significance Passive quadrature demultiplexing allows full-range optical coherence tomography (FR-OCT). However, imperfections in the wavelength- and frequency-response of the demodulation circuits can cause residual mirror artifacts, which hinder high-quality…
Authors not listed
Material properties calculated using density functional theory (DFT) are often corrected to more closely match experimental values, but the most common correction method has flaws that lead to unphysical results and false positives in the material discovery process. In this work, we show that these flaws stem from the…
Omer Markovitch, Juntian Wu, Otto Sijbren
Copying information is vital for life's propagation. Current life forms maintain a low error rate in replication using complex machinery to prevent and correct errors. However, primitive life had to deal with higher error rates, limiting its ability to evolve. Discovering mechanisms to reduce errors would alleviate…
Bhaskar Rana, Gregory Beran, John Herbert
We consider several molecules characterized by pi-electron conjugation whose extent changes along a flexible torsional coordinate, and which represent the monomer units of polymorphic molecular crystals. Delocalization error in density functional theory (DFT) adversely impacts conformational energies in these species…
Montgomery Gray, Paige Bowling, John Herbert
A widespread belief persists that the Boys-Bernardi function counterpoise (CP) procedure "overcorrects" supramolecular interaction energies for the effects of basis-set superposition error. To the extent that this is true for correlated wave function methods, it is usually an artifact of low-quality basis sets, but the…
Philipp Euringer, Gerald Hechenblaikner, Francis Soualle, Walter Fichter
'Walter Fichter'] Abstract—Future space observatories achieve detection of gravitational waves by interferometric measurements of a carrier phase, allowing to determine relative distance changes, in combination with an absolute distance measurement based on the transmission of pseudo-random noise chip sequences. In…
Authors not listed
Molecular systems capable of directing the flow of excitons are key to the development and optimization of optoelectronic materials. The transport of excitons across multiple molecules is governed by the intermolecular electronic coupling network. In this manuscript, we consider the effects of complex-valued…