Article
Quantum Science & Technology
Daniel Dilley, Alvin Gonzales, Mark Byrd
Summary: This article introduces a method of manipulating two-qubit quantum states on local systems using special unitaries, and provides an exact formula for determining local unitaries. Simple modifications to the correlation matrix enable control over two-qubit quantum states.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Doru Sticlet, Balazs Dora, Catalin Pascu Moca
Summary: This paper develops a general theory for linear response in non-Hermitian systems and derives a modified Kubo formula for the generalized susceptibility. The researchers use this theory to evaluate the dynamical response of a non-Hermitian Dirac model perturbed by a time-dependent electric field. They find that even excitations that travel faster than the speed of light have finite dc conductivity, and the optical sum rule is satisfied for all masses.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Tamara Kohler, Stephen Piddock, Johannes Bausch, Toby Cubitt
Summary: Recent work has shown the existence of universal Hamiltonians, which are simple spin-lattice models capable of simulating any quantum many-body system with any desired accuracy. This study provides a complete classification of the simulation ability of quantum Hamiltonians based on their complexity classes, deriving necessary and sufficient complexity-theoretic conditions characterizing universal quantum Hamiltonians. The results not only offer simplified proofs of previous results on Hamiltonian universality and a pathway to new universal constructions, but also provide insight into the origins of universality.
Article
Quantum Science & Technology
Tamara Kohler, Stephen Piddock, Johannes Bausch, Toby Cubitt
Summary: This research work provides a complete classification of the simulation ability of quantum Hamiltonians by their complexity classes, deriving necessary and sufficient complexity-theoretic conditions characterizing universal quantum Hamiltonians, and offering insight into the origins of universality.
Article
Chemistry, Physical
S. Z. Zhiznin, N. N. Shvets, V. M. Timokhov, A. L. Gusev
Summary: The green transition, with the hydrogen industry playing a leading role, has attracted special attention from various sectors worldwide. It is predicted to have a significant impact on the global energy map in terms of economy, technology, and geopolitics. Despite the anticipated slowdown due to the global energy crisis, the green transition, emphasizing hydrogen, continues to progress and will significantly influence international economic relations. With financial support, advanced technologies along the hydrogen energy chain are actively developing, creating hydrogen markets, and establishing hydrogen energy command centers at different levels.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Engineering, Environmental
Palagiri Bhavani, D. Praveen Kumar, Jong Suk Yoo, Murid Hussain, Seunghyun Weon, Wooyul Kim, Young-Kwon Park
Summary: Dispersing active metals into theoretical atomic level has emerged as a cost-effective means for constructing catalysts, namely single-atom catalysts (SACs). SACs are integrated with various photocatalysts to serve as efficient platforms for solar energy conversion. However, the limitations of SACs containing only one type of active site restrict various chain reactions, inhibiting catalytic performance. To overcome these limitations, dual atom catalysts (DACs) have emerged as a new inventive material for boosting photocatalytic reactions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Multidisciplinary
Mark A. Webster, Armanda O. Quintavalle, Stephen D. Bartlett
Summary: Storing quantum information in CSS codes and protecting it from errors is important, but being able to transform the information fault-tolerantly is equally significant. This research focuses on the study of transversal logical operators composed of diagonal Clifford hierarchy gates, aiming to identify them more generally and with lower computational complexity than previous methods. The research also presents a method for constructing CSS codes with a desired diagonal logical Clifford hierarchy operator. The techniques used in this work, such as representing operators as diagonal XP operators, may have broader applications.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Bingjie Hu, Yao Wu, Kang Wang, Huazhang Guo, Zhendong Lei, Zheng Liu, Liang Wang
Summary: In this study, a solvent-free mechanochemical approach using graphene quantum dots (GQDs) as exfoliation agents was employed for the synthesis and functionalization of nearly atom-layered MoS2 nanosheets (ALMS). The resulting ALMS exhibited ultrathin thickness and high solvent stability, as well as impressive yield and long-term durability as an electrocatalyst for hydrogen evolution reaction (HER). Importantly, the catalytic properties of ALMS were significantly influenced by ball milling production conditions. The GQD-assisted large-scale machinery synthesis pathway provides a promising avenue for the development of efficient and high-performance ultrathin 2D materials.
Article
Chemistry, Physical
Pei-Lin Kang, Zheng-Xin Yang, Cheng Shang, Zhi-Pan Liu
Summary: A low-cost neural network method called G-MBNN is proposed to fit the global potential energy surface of complex systems and provide improved energy and force resolution. In G-MBNN, many-body energy terms based on the local atomic environment are explicitly included in the computation of the total energy, allowing for accurate representation of various complex energy terms.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Physics, Multidisciplinary
Dayou Yang, Susana F. Huelga, Martin B. Plenio
Summary: Continuous monitoring of driven-dissipative quantum-optical systems is crucial for achieving highly precise measurements beyond the classical limit. We design a novel continuous-measurement strategy and develop a universal method to efficiently retrieve the quantum Fisher information. We also establish an effective formula for evaluating the quantum Fisher information of the emission field of driven-dissipative open sensors.
Article
Quantum Science & Technology
Sven Jandura, Jeff D. Thompson, Guido Pupillo
Summary: Researchers introduced a new gate sequence that is robust against intensity inhomogeneity and Doppler shifts, reducing the sensitivity of gate operations in neutral-atom qubits to experimental imperfections. The gates outperform existing ones for moderate or large imperfections, and show improved performance even for very small imperfections when applied to erasure-biased qubits based on metastable 171Yb.
Article
Computer Science, Interdisciplinary Applications
Maxime Bassenne, Lin Fu, Ali Mani
Summary: The study introduces a novel framework to handle implicit stiffness in physical terms using TASE operators, which can address both physical and numerical stiffness. The TASE method offers unconditional stability and can solve nonlinear problems while maintaining high-order accuracy.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Review
Chemistry, Physical
Zhenzhou Wang, Yikun Wang, Sheida Afshan, Johanna Hjalmarsson
Summary: Increasing environmental legislation requires the marine industry to reduce greenhouse gases, sulphur oxides, and nitrogen oxides emissions. Insights from academic and industrial activities show tangible opportunities for adopting alternative fuels, with hydrogen as a promising option. However, large-scale bunkering of hydrogen on marine platforms poses inherent risks.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Fan Xie, Wenhao Sun, Beppo Hartwig, Daniel A. Obenchain, Melanie Schnell
Summary: The role-exchanging concerted torsional motion of two hydrogen atoms in the homochiral dimer of trans-1,2-cyclohexanediol was characterized through a combination of rotational spectroscopy and theoretical modeling. The results show that the hydrogen atoms exhibit a concerted tunneling motion, leading to the inversion of the dipole moment components. This motion is coupled with acceptor switching motions and has important implications for understanding chirality in intermolecular interactions and dynamics.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Kalyan Ghosh, Christian Iffelsberger, Martin Konecny, Jan Vyskocil, Jan Michalicka, Martin Pumera
Summary: This study demonstrates the use of a triboelectric nanogenerator (TENG) for the production of green hydrogen from renewable mechanical energy. A magnetic covalent organic framework composite is used as the positive triboelectric material, while MXene incorporated polydimethylsiloxane (PDMS) film serves as the negative triboelectric material in a contact-separation mode TENG (CS-TENG). Micropatterns are incorporated on the surface of PDMS/MXene film using 3D printing technology. The CS-TENG harvests energy from simple mechanical actions and the harvested electrical energy is used for water electrolysis, producing hydrogen and oxygen. This research is expected to enable the production of green hydrogen from mechanical energy sources such as raindrops, wind, and vehicle movements.
ADVANCED ENERGY MATERIALS
(2023)
