Results 61 to 70 of about 1,071,813 (330)
Measuring the degree of unitarity for any quantum process
, 2014 Quantum processes can be divided into two categories: unitary and non-unitary ones. For a given quantum process, we can define a \textit{degree of the unitarity (DU)} of this process to be the fidelity between it and its closest unitary one.
Cui, Jing-Xin, Wang, Z. D.
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Limit theorems for open quantum random walks [PDF]
, 2012 We consider the limit distributions of open quantum random walks on one-dimensional lattice space. We introduce a dual process to the original quantum walk process, which is quite similar to the relation of Schr\"odinger-Heisenberg representation in ...
Konno, Norio, Yoo, Hyun Jae
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Quantifying Quantum-Mechanical Processes [PDF]
Scientific Reports, 2017 AbstractThe act of describing how a physical process changes a system is the basis for understanding observed phenomena. For quantum-mechanical processes in particular, the affect of processes on quantum states profoundly advances our knowledge of the natural world, from understanding counter-intuitive concepts to the development of wholly quantum ...
Hsieh, Jen-Hsiang +2 more
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High-fidelity geometric quantum gates exceeding 99.9% in germanium quantum dots
Nature CommunicationsAchieving high-fidelity and robust qubit manipulations is a crucial requirement for realizing fault-tolerant quantum computation. Here, we demonstrate a single-hole spin qubit in a germanium quantum dot and characterize its control fidelity using gate ...
Yu-Chen Zhou +13 more
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Application of a Quantum-Well Silicon NMOS Transistor as a Folding Amplifier Frequency Multiplier
IEEE Journal of the Electron Devices Society, 2017 This paper reports on the use of a single quantum well (QW) silicon NMOS transistor to generate a folded current-voltage transfer function that enables frequency doubling and tripling. The QW NMOS device is fabricated entirely on an industrially standard
Clint Naquin +8 more
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Advanced Engineering Materials, Volume 27, Issue 6, March 2025.ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur +5 more
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Advanced Engineering Materials, EarlyView.This article provides an overview of recent advancements in bulk processing of rare‐earth‐free hard magnetic materials. It also addresses related simulation approaches at different scales. The research on rare‐earth‐free magnetic materials has increased significantly in recent years, driven by supply chain issues, environmental and social concerns, and
Daniel Scheiber, Andrea Bachmaier
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A quantum causal discovery algorithm
, 2018 Finding a causal model for a set of classical variables is now a well-established task---but what about the quantum equivalent? Even the notion of a quantum causal model is controversial. Here, we present a causal discovery algorithm for quantum systems.
Costa, Fabio, Giarmatzi, Christina
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2024 IEEE 65th Annual Symposium on Foundations of Computer Science (FOCS)Many problems in linear algebra -- such as those arising from non-Hermitian physics and differential equations -- can be solved on a quantum computer by processing eigenvalues of the non-normal input matrices. However, the existing Quantum Singular Value Transformation (QSVT) framework is ill-suited to this task, as eigenvalues and singular values are ...
Low, Guang Hao, Su, Yuan
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Challenges during Flash Lamp Annealing of Aerosol‐Deposited Barium Titanate Films
Advanced Engineering Materials, EarlyView.Aerosol deposition is used to rapidly deposit barium titanate films with thicknesses ranging from 2 to 16 μm at room temperature, eliminating the need for further densification. However, to recover the electromechanical properties, annealing is required, which limits the usage of temperature‐sensitive substrates.
Michel Kuhfuß +7 more
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