Results 61 to 70 of about 470,444 (191)
Numerical range, dilation, and completely positive maps
Proceedings of the American Mathematical Society, 2019 A proof using the theory of completely positive maps is given to the fact that if A ∈ M 2 A \in M_2 or A ∈ M 3 A \in M_3 ...
Chi-Kwong Li, Y. Poon
semanticscholar +1 more source
Lifting theorems for completely positive maps [PDF]
Journal of Noncommutative Geometry, 2015 We prove lifting theorems for completely positive maps going out of exact $C^\ast$-algebras, where we remain in control of which ideals are mapped into which.
James Gabe
semanticscholar +1 more source
Measure of positive and not completely positive single-qubit Pauli maps [PDF]
Physical Review A, 2019 The time evolution of an initially uncorrelated system is governed by a completely positive (CP) map. More generally, the system may contain initial (quantum) correlations with an environment, in which case the system evolves according to a not ...
V. Jagadish +2 more
semanticscholar +1 more source
Distinguishing between statistical and systematic errors in quantum process tomography
New Journal of Physics, 2019 It is generally assumed that every process in quantum physics can be described mathematically by a completely positive map. However, experimentally reconstructed processes are not necessarily completely positive due to statistical or systematic errors ...
Sabine Wölk +3 more
doaj +1 more source
Tomographically reconstructed master equations for any open quantum dynamics [PDF]
Quantum, 2018 Memory effects in open quantum dynamics are often incorporated in the equation of motion through a superoperator known as the memory kernel, which encodes how past states affect future dynamics.
Felix A. Pollock, Kavan Modi
doaj +1 more source
Heliyon, 2023 The kriging-based estimation of the different types of atmospheric particulate matter (PM) pollutions defined in the air quality regulation raises some operational problems because the (co)kriging equations are obtained by minimizing a linear combination
Maxime Beauchamp, Bertrand Bessagnet
doaj +1 more source
SchWARMA: A model-based approach for time-correlated noise in quantum circuits
Physical Review Research, 2021 Temporal noise correlations are ubiquitous in quantum systems, yet often neglected in the analysis of quantum circuits due to the complexity required to accurately characterize and model them.
Kevin Schultz +3 more
doaj +1 more source
Journal of Materials Research and Technology, 2022 The present work focuses on the high temperature flow behavior of additively manufactured 316 L stainless steel. Toward this end, a series of hot compression tests were conducted in the temperature range of 700–1000 °C under the strain rates of 0.001, 0 ...
A. Esmaeilpour +3 more
doaj +1 more source
ASYMPTOTIC STABILITY I: COMPLETELY POSITIVE MAPS [PDF]
International Journal of Mathematics, 2004 We show that for every "locally finite" unit-preserving completely positive map P acting on a C*, there is a corresponding *-automorphism α of another unital C*-algebra such that the two sequences P, P2, P3, … and α, α2, α3, … have the same asymptotic behavior. The automorphism α is uniquely determined by P up to conjugacy.
openaire +3 more sources
Beyond unital noise in variational quantum algorithms: noise-induced barren plateaus and limit sets [PDF]
QuantumVariational quantum algorithms (VQAs) hold much promise but face the challenge of exponentially small gradients. Unmitigated, this barren plateau (BP) phenomenon leads to an exponential training overhead for VQAs.
Phattharaporn Singkanipa +1 more
doaj +1 more source