Correction
Water Resources
Jessica R. Ayers, Gabriele Villarini, Yves Tramblay, Hanbeen Kim
Summary: This study provides the first continental assessment of baseflow in Africa, analyzing the baseflow index, baseflow seasonality, and monthly baseflow trends. Results show that the baseflow season in west-central Africa occurs from August to November, while in southern and northern Africa it occurs from January to May and January to April respectively. Baseflow decreases were observed in west-central Africa from 1950 to 1980, with increases after 1980. In southern Africa, no clear pattern was found, but decreases were detected from 1981 to 2018. In northern Africa, baseflow trends consistently decreased throughout the entire record. Precipitation trends only aligned with baseflow changes in west-central Africa.
HYDROLOGICAL SCIENCES JOURNAL
(2023)
Correction
Mathematics
Joseph Hirsh, Joan Milles
Summary: In this corrigendum, we address a mistake in our article Curved Koszul duality theory [1] and provide modifications to our definitions of morphisms between semi-augmented properads and between curved coproperads.
MATHEMATISCHE ANNALEN
(2023)
Correction
Health Care Sciences & Services
Rebecca Garr Whitaker, Nina Sperber, Michael Baumgartner, Alrik Thiem, Deborah Cragun, Laura Damschroder, Edward J. Miech, Alecia Slade, Sarah Birken
Summary: The paper has been amended and the revised version can be accessed through the original article.
IMPLEMENTATION SCIENCE
(2021)
Correction
Biochemical Research Methods
Irwin A. Eydelnant, Uvaraj Uddayasankar, Bingyu 'Betty' Li, Meng Wen Liao, Aaron R. Wheeler
Summary: This study presents the development of a virtual microwell technology for digital microfluidic reagent dispensing and cell culture.
Article
Geosciences, Multidisciplinary
Daniel Moran, Peter-Paul Pichler, Heran Zheng, Helene Muri, Jan Klenner, Diogo Kramel, Johannes Toebben, Helga Weisz, Thomas Wiedmann, Annemie Wyckmans, Anders Hammer Stromman, Kevin R. Gurney
Summary: City-level CO2 emissions inventories are crucial for achieving the EU's decarbonization goals and assessing the impacts of decarbonization transition. This study presents a new CO2 emissions inventory that covers 116,572 municipal and local-government units in Europe, providing emissions data at different administrative levels.
EARTH SYSTEM SCIENCE DATA
(2022)
Correction
Chemistry, Multidisciplinary
Manuel Koeckinger, Tania Ciaglia, Michael Bersier, Paul Hanselmann, Bernhard Gutmann, C. Oliver Kappe
Summary: This study presents a correction for the utilization of fluoroform for difluoromethylation in continuous flow, resulting in a concise synthesis of alpha-difluoromethyl-amino acids.
Correction
Mathematics
Frank Calegari, David Geraghty
Summary: A correction notice has been published for this paper: 10.1007/s00222-017-0749-x.
INVENTIONES MATHEMATICAE
(2022)
Article
Chemistry, Inorganic & Nuclear
Yingwu Zhou, Yujie Ban, Weishen Yang
Summary: This study explores the reversible phase transformations of the metal-organic framework ZIF-108, demonstrating its ability to transition between sodalite, diamondoid, and large pore sodalite structures under different conditions. The results also reveal that the large pore sodalite version of ZIF-108 can produce mixed matrix membranes with unique interfacial structures, enhancing separation efficiency.
INORGANIC CHEMISTRY
(2022)
Editorial Material
Cell Biology
Anastasiia Ananeva, Nailia Osipova, Elmira Elagina, Anna V. Andryushkina, Elena I. Shagimardanova
Summary: This article reports the discovery of two novel HLA alleles in Russian individuals, identified using next generation sequencing.
Retraction
Agronomy
Gholamhossein Abdollahzadeh, Christos A. Damalas, Mohammad Sharif Sharifzadeh, Hossein Ahmadi-Gorgi
Summary: The article was retracted due to positive advice from an illegitimate reviewer, violating publishing ethics standards. The editor apologized to the reviewer whose identity was assumed and to the readers for not detecting the deception during the submission process.
Correction
Oncology
Li Cui, Hua Zhou, Hu Zhao, Yaojun Zhou, Renfang Xu, Xianlin Xu, Lu Zheng, Zhong Xue, Wei Xia, Bo Zhang, Tao Ding, Yunjie Cao, Zinong Tian, Qianqian Shi, Xiaozhou He
Summary: A revised version of the paper has been published and can be accessed through the original article.
Article
Astronomy & Astrophysics
L. Chahine, A. Lopez-Sepulcre, R. Neri, C. Ceccarelli, S. Mercimek, C. Codella, M. Bouvier, E. Bianchi, C. Favre, L. Podio, F. O. Alves, N. Sakai, S. Yamamoto
Summary: The study aims to determine the abundance ratios of iCOMs in HOPS-108 and understand the impact of environmental conditions on its chemistry by comparing with other hot corinos. The results reveal rich organic chemistry in HOPS-108 and potential differences compared to other hot corinos. These findings are important for understanding the chemical origins of the Solar System.
ASTRONOMY & ASTROPHYSICS
(2022)
Correction
Physics, Multidisciplinary
Masahito Hayashi, Toyohiro Tsurumaru
Summary: This paper contains an error in the definition of g(t)(x) for the second order asymptotic expansion for the sacrifice bit, which is corrected and derived in this corrigendum.
NEW JOURNAL OF PHYSICS
(2021)
Correction
Genetics & Heredity
Isaure Vanmeerbeek, Daniel M. Borras, Jenny Sprooten, Oliver Bechter, Sabine Tejpar, Abhishek D. Garg
Summary: ICB-based immunotherapy has revolutionized oncology. Biomarkers-driven application of ICBs can increase their efficacy. However, the sequencing of ICB therapy may have a specific impact on the T cell repertoire and influence the predictive value of tumor immune biomarkers.
GENES AND IMMUNITY
(2022)
Article
Astronomy & Astrophysics
Gregor Rauw, Yael Naze, Asif ud-Doula, Coralie Neiner
Summary: We analyzed optical and X-ray spectroscopy of the Of?p star HD 108, finding recovery of optical emission lines from their minimum emission state. The variations of H alpha emission provide constraints on the rotation axis and magnetic axis. Balmer emission lines show stochastic variability, and TESS photometry reveals transient modulations and red noise variations. X-ray observations indicate increased flux and spectral hardening compared to previous observations. Magnetohydrodynamic simulations and synthetic X-ray spectra agree well with the observations. Radial velocities suggest the presence of an unseen companion.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Boris O. Volkov, Oleg Morzhin, Alexander N. Pechen
Summary: The mathematical analysis of quantum control landscapes is crucial in determining the absence or presence of traps in quantum control objectives. In this study, a rigorous analysis of control landscapes for ultrafast generation of single-qubit quantum gates was conducted, showing that the control landscape for ultrafast phase shift gate generation is trap-free using a combination of analytical methods and numerical optimization techniques.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Physics, Multidisciplinary
Lev Lokutsievskiy, Alexander Pechen
Summary: This study investigates the controllability of all density matrices in a two-level open quantum system driven by coherent and incoherent controls. It shows that high precision density matrices can be achieved in the Bloch ball, and demonstrates the complete controllability of the system in the set of all density matrices. The reachable set as a function of final time exhibits a non-trivial structure.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Mathematics, Applied
Oleg Morzhin, Alexander N. Pechen
Summary: The study investigated a two-level open quantum system governed by the Gorini-Kossakowski-Sudarshan-Lindblad equation, with controls depending on coherent and incoherent factors. Results regarding reachability, controllbility, and minimum-time control were obtained through Bloch parametrization.
PROCEEDINGS OF THE STEKLOV INSTITUTE OF MATHEMATICS
(2021)
Article
Mathematics, Applied
K. A. Lyakhov, A. N. Pechen
Summary: A new optimization criterion for iterative zirconium isotope recovery by laser-assisted retardation of condensation is proposed, with optimization performed over parameters such as gas flow pressure and temperature, target gas molar fraction, laser pulse intensity, nozzle dimensions, and total processing time. The evolution of the objective function for zirconium isotope separation has been evaluated as a function of gas flow core temperature at different ambient gas pressures, with the laser intensity variation range needing to satisfy the condition of the isotope separation method used.
PROCEEDINGS OF THE STEKLOV INSTITUTE OF MATHEMATICS
(2021)
Article
Physics, Multidisciplinary
E. B. Fel'dman, A. N. Pechen, A. I. Zenchuk
Summary: This work focuses on optimal transfer of quantum states via spin chains, proposing a protocol for restoring multi-quantum coherence matrices of multi-qubit quantum states and developing a method for constructing a 0-order coherence matrix that can be perfectly transferred in this process. The restoring protocol is based on a specially constructed unitary transformation applied to the state of the extended receiver, which is universally optimal for any higher-order coherence matrices.
Article
Mathematics
G. G. Amosov, A. S. Mokeev, A. N. Pechen
Summary: In this study, error correction based on the theory of non-commutative graphs for a model of a qubit interacting with a quantum oscillator is considered. The dynamics of the composite system is governed by the Schrodinger equation, which generates a positive operator-valued measure (POVM) for the system dynamics. A quantum channel is constructed to generate the non-commutative graph as a linear envelope of the POVM, by applying a generalized version of a quantum channel using the apparatus of von Neumann algebras. The results analyze a non-commutative graph generated by a qubit interacting with a quantum oscillator, where the quantum anticlique determining the error correcting subspace has an explicit expression.
LOBACHEVSKII JOURNAL OF MATHEMATICS
(2021)
Article
Mathematics
K. A. Lyakhov, A. N. Pechen
Summary: This paper evaluates the enrichment factor and product cut for molybdenum isotopes separation using the laser assisted retardation of condensation method under different gas flow temperatures and pressures. The stabilization rate of the system with diffusion and nonlinear reaction term is estimated. The laser excitation rate is determined based on the photo-absorption cross section as a function of gas flow pressure and temperature from experimental data.
LOBACHEVSKII JOURNAL OF MATHEMATICS
(2021)
Article
Physics, Nuclear
Vadim N. Petruhanov, Alexander N. Pechen
Summary: In this work, we investigate a model of two qubits driven by coherent and incoherent time-dependent controls. We analyze the optimal control problem of state preparation and derive analytical expressions for the gradients of the objective. By studying the evolution of various parameters, we observe distinct behaviors in the optimization process for different classes of coherent control.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Mathematics, Interdisciplinary Applications
Alexander N. Pechen, Sergey Borisenok, Alexander L. Fradkov
Summary: This article presents a new method for manipulating the energy of a quantum harmonic oscillator using coherent and incoherent control. The proposed algorithm allows for complete control over the oscillator's energy. Additionally, a robust control algorithm is introduced, which ensures system stability.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Optics
Vadim N. N. Petruhanov, Alexander N. N. Pechen
Summary: In this work, an environment formed by incoherent photons is considered as a resource for controlling open quantum systems via incoherent control. Single-qubit gates for a two-level open quantum system are generated by exploiting coherent and incoherent controls. The control problem is formulated as minimization of an objective functional and the gradient of the objective functional with respect to piecewise constant controls is obtained. Optimal trajectories in the Bloch ball are computed and the relation of quantum gate generation with optimization on complex Stiefel manifolds is discussed. The developed methodology is applied to unitary gates as a testing example.
Article
Physics, Multidisciplinary
V. N. Petruhanov, A. N. Pechen
Summary: The GRadient Ascent Pulse Engineering (GRAPE) method is widely used for optimizing in quantum control. In this work, the GRAPE method is applied to open quantum systems driven by both coherent and incoherent controls. The gradient of various objectives for general N-level open quantum systems is computed, with a focus on the case of a single qubit which is solved analytically. The efficiency of the algorithm is demonstrated through numerical simulations, and the robustness of the optimal controls is also studied.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Quantum Science & Technology
Oleg V. Morzhin, Alexander N. Pechen
Summary: This article investigates the optimal state manipulation of a two-qubit system governed by the Gorini-Kossakowski-Sudarshan-Lindblad master equation. Both coherent and incoherent controls are considered and the Hilbert-Schmidt overlap between final and target density matrices is optimized.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
Sergei V. Kozyrev, Alexander N. Pechen
Summary: This paper introduces a model of charge separation in quantum photosynthesis as a model of quantum feedback control in a system of interacting excitons and vibrons. It is found that quantum feedback can induce a nonlinear evolution equation, describing the Landau-Zener transition with decoherence. This model explains the irreversibility in the process of charge separation for quantum photosynthesis and the coincidence of the energy of the vibron paired to the transition and the Bohr frequency of the transition.
Article
Quantum Science & Technology
G. A. Bochkin, E. B. Fel'dman, I. D. Lazarev, A. N. Pechen, A. Zenchuk
Summary: In this work, the transfer of coherence matrices along spin-1/2 chains of various length is studied. The perfect transfer of zero-order coherence matrix is possible if its elements are properly fixed. In some cases, an extended receiver with optimized unitary transformation is required for achieving perfect transfer. The study considers the asymptotic perfectly transferable zero-order coherence matrix for an infinitely long chain and examines the deviation of a perfectly transferred state from this asymptotic state as a function of the chain length for different sizes of the extended receiver. The transfer of arbitrary parameters via the nondiagonal elements of the zero-order coherence matrix is also examined and optimized using the unitary transformation of the extended receiver.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Optics
G. G. Amosov, A. S. Mokeev, A. N. Pechen
Summary: Quantum error correction is crucial for quantum information transmission and quantum computing. This study utilizes the theory of noncommutative operator graphs to analyze error correction in scenarios where a finite-dimensional quantum system is coupled to an infinite-dimensional system, with a specific focus on a qubit coupled via the Jaynes-Cummings Hamiltonian with a bosonic coherent field. By extending the theory and constructing noncommutative graphs using coherent states, the researchers identify the quantum anticlique and analyze its behavior in relation to the frequencies of the qubit and bosonic field. The proposed scheme can be applied to systems with similar spectrum decompositions as the JC model, providing insights into error-correcting subspaces for experimental parameter values.
