Results 41 to 50 of about 579,350 (178)
On some variational problems in the theory of unitarily invariant norms and Hadamard products [PDF]
, 2001 We deal with two recent conjectures of R.-C. Li [Linear Algebra Appl. 278 (1998) 317–326], involving unitarily invariant norms and Hadamard products.
Romeo, M. +5 more
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Volume ratio, sparsity, and minimaxity under unitarily invariant norms [PDF]
2013 IEEE International Symposium on Information Theory, 2013 The current paper presents a novel machinery for studying non-asymptotic minimax estimation of high-dimensional matrices, which yields tight minimax rates for a large collection of loss functions in a variety of problems. Based on the convex geometry of finite-dimensional Banach spaces, we first develop a volume ratio approach for determining minimax ...
Zongming Ma, Yihong Wu 0001
openaire +5 more sources
Outliers in the spectrum of large deformed unitarily invariant models [PDF]
, 2017 We characterize the possible outliers in the spectrum of large deformed unitarily invariant additive and multiplicative models, as well as the eigenvectors corresponding to them.
Février, Maxime +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2002 典则相关变量的优良性质可以用一些极值来描述.在酉不变模意义下,得出了典则相关变量的一个极大值定理和一个极小值定理.其结果说明典则相关变量在更一般意义下具有最优性质.
ZHANGGuo-fen(张帼奋) +1 more
doaj +1 more source
Some inequalities for unitarily invariant norms [PDF]
Journal of Mathematical Inequalities, 2012 This paper aims to present some inequalities for unitarily invariant norms. In section 2, we give a refinement of the Cauchy-Schwarz inequality for matrices. In section 3, we obtain an improvement for the result of Bhatia and Kittaneh (Linear Algebra Appl. 308 (2000) 203-211).
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Subspace Acceleration for Efficient Nonlinear Water Wave Simulation
International Journal for Numerical Methods in Fluids, Volume 98, Issue 10, Page 1165-1180, October 2026.We introduce an exponentially weighted subspace acceleration technique to reduce GMRES iterations for solving the Poisson equation with time‐dependent coefficients in nonlinear, dispersive free‐surface flows governed by the incompressible Navier‐Stokes equations. The method significantly reduces memory requirements and computational complexity compared
Rasmus Kleist Hørlyck Sørensen +3 more
wiley +1 more source
Compile‐Once Block Encodings for Masked Similarity‐Transformed Effective Hamiltonians
Advanced Quantum Technologies, Volume 9, Issue 9, September 2026.Composer transforms structured electronic‐structure operators into a reusable quantum‐circuit fabric. Once compiled, the same block‐encoding architecture is re‐dialed through coefficients, rotation angles, and masks to generate similarity‐transformed effective Hamiltonians across related problem instances, avoiding repeated structural recompilation ...
Bo Peng, Yuan Liu, Karol Kowalski
wiley +1 more source
Finite‐Time Protocols Stabilize Charging in Noisy Ising Quantum Batteries
Advanced Quantum Technologies, Volume 9, Issue 9, September 2026.A transverse‐field quantum Ising chain is charged as a quantum battery using finite‐time ramps, which suppress energy oscillations and stabilize charging compared to sudden quenches. When time‐correlated noise is introduced, the outcome depends entirely on the protocol: noise can either boost stored energy or improve efficiency, never both ...
Riccardo Grazi +3 more
wiley +1 more source
Squeezed‐State Semi‐Device‐Independent Quantum Randomness Generation
Advanced Quantum Technologies, Volume 9, Issue 9, September 2026.Semi‐device‐independent quantum randomness is certified for squeezed‐coherent binary states using only their trusted overlap and the observed homodyne error. Including the deterministic extremes of the full binary‐qubit POVM gives the correct closed‐form Shannon rate.
Hamid Tebyanian
wiley +1 more source
Some operator inequalities for unitarily invariant norms [PDF]
, 2023 Let L(H) be the algebra of bounded operators on a complex separable Hilbert space H. Let N be a unitarily invariant norm defined on a norm ideal J ⊆ L(H). Given two positive invertible operators P,Q ∊ L(H) and k ∊ (−2, 2], we show that N (PTQ−1 + P−1TQ +
Mosconi, Irene +2 more
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