Hassan Nasreddine

collaborators

5 papers

quant-ph2026

Energy-Constrained Commutator Variance for Weyl Pairs

Hassan Nasreddine

Let $W$ be a representation of the Weyl relations on a separable Hilbert space and write $R_{W} (K) = {W (f) : f \in K}^{''}$ . If the symplectic pairing of $K_{1}$ and $K_{2}$ is nonzer…

quant-ph2026

Entropy Moduli and Support-Sensitive BKM Coercivity for Rank-Deficient Non-Commutative Markov Semigroups

Hassan Nasreddine

We study entropy--coherence relations near rank-deficient support boundaries in finite-dimensional quantum systems. For block-diagonal reference states, we establish support-sensit…

quant-ph2026

Sharp Entropy Cost of Coherent Leakage Across a Block Decomposition

Hassan Nasreddine

Let $H = P H \oplus Q H$ and let $Π ρ = P ρP \oplus QρQ$ be the two-block pinching of a density matrix. Write $A = P ρP$ , $B = P ρQ$ , and $C = QρQ$ . We study the block-…

quant-ph2026

Essential Duality and Quantitative Channel Composability in Algebraic Quantum Field Theory

Hassan Nasreddine

Let $O\mapsto A(O)$ be a local Haag--Kastler net and let $A^d(O)=A(O')'$ be its dual net. Normal unital completely positive maps on $B(H)$ that fix $A(O')$ pointwise are ex…

quant-ph2026

Entropy Stability under Block-Separable Constraints: Fixed-Weight Rank-Lattice Envelopes and Convexification

Hassan Nasreddine

For block-diagonal quantum states with prescribed block weights and dimensions, we determine the minimum von Neumann entropy excess at each trace-norm distance from the blockwise-p…