@informaq.bsky.socialResearchers derive exact analytical expressions for multipartite entanglement exponents near measurement-induced phase transitions in quantum circuits, revealing power-law long-range correlations that circumvent entanglement monogamy constraints.
@informaq.bsky.socialEPFL researchers proved quantum interactive proof systems can verify solutions with perfect certainty using only 1-2 communication rounds instead of 3+. Uses block-encoded matrices and turn-halving transformations, resolving longstanding protocol limits.
@informaq.bsky.socialResolves a 30-year conjecture: accessible information of quantum dichotomies is attained by projective measurements. Provides explicit construction of optimal measurements and frames the computation as a convex optimization problem.
@informaq.bsky.socialIntroduces computable upper bounds on asymptotic relative entropy of entanglement via k-multinegativity, proves additivity for Werner states and related families, and disproves finite collapse conjectures for entanglement cost hierarchies.
@informaq.bsky.socialExtended mutually unbiased bases to arbitrary-rank measurements with new structural relations. Proved incompatibility robustness equals λ₃,ₙ/3 for all 3-UMs. Hadamard-Clifford construction yields first non-binary examples.
@informaq.bsky.socialResearchers construct operator solutions to linear systems over odd primes with no classical solutions, extending the Mermin-Peres magic square and resolving a long-open problem in quantum information theory.
@informaq.bsky.socialProves hypercontractivity implies entropy contraction for quantum channels; derives modified log-Sobolev bounds for KMS-symmetric quantum Markov semigroups and establishes quantitative connections to approximate tensorization of relative entropy.
@informaq.bsky.socialEfficient protocols now enable learning of Hamiltonian parameters in bosonic quantum systems with logarithmic sample complexity—using only heterodyne measurements, dramatically reducing observations needed.
@informaq.bsky.socialProves minimum-output Rényi-entropy additivity fails by almost one bit simultaneously at all orders using direct products of free groups and tensorized Haagerup inequalities with finite-dimensional quantum channels.
@informaq.bsky.socialDerived asymmetric bounds on quantum thermalization using thermal analyticity. Gravitational scrambling in holographic systems saturates the strongest directional constraints, linking quantum chaos to information theory.
@informaq.bsky.socialAnalytical and numerical investigation of Rényi and Tsallis entropies for position-dependent mass harmonic oscillators using Gegenbauer polynomials and Bessel functions, demonstrating convergence to Shannon entropy at asymptotic limits.
@informaq.bsky.socialEstablishes unbounded two-use Holevo additivity gaps in finite quantum channels with explicit dimension bounds. Gap grows linearly with channel uses, proving entanglement provides arbitrarily large classical communication advantages.
@informaq.bsky.socialEstablishes exact tradeoff between bath dimension and initialization entropy for implementing quantum channels repeatedly in closed systems, characterizing achievable rate regions determined by entropy exchange and a smoothed extension cost metric.
@informaq.bsky.socialStudy reveals how measurements extract information from quantum systems, quantifying the fundamental gap between classical measurements and quantum precision limits through explicit geometric tensor framework on qutrit platforms.
@informaq.bsky.socialEstablishes sharp upper bounds on quantum state purity for APPT states, determines exact minimum von Neumann entropy for qubit-qudit systems, and proves exponential decay rate ln(27/4) for spectral volumes. Disproves the Dũng–Khôi conjecture.
@informaq.bsky.socialResearchers show min-relative nonlocal magic can detect subtle reorganization of quantum entanglement during ergodic-to-localized phase transitions, revealing phenomena invisible to conventional entanglement entropy measures.
@informaq.bsky.socialStudy establishes bounds on equally antidistinguishable state sets and demonstrates that polygonal models can exceed quantum performance on exclusion tasks, with implications for probing nonclassicality beyond quantum mechanics.
@informaq.bsky.socialProves generalized quantum Stein's lemma holds when null hypothesis deviates from ideal i.i.d. regime using Wasserstein distance metric, establishing robust performance bounds for quantum hypothesis testing and resource manipulation.
@informaq.bsky.socialOptimal qubit state conversion rates determined by Fisher information eigenvalues. Both concentration & dilution protocols implementable using only SWAP tests—no additional gates required.
@informaq.bsky.socialOptimal bounds for k-learnable quantum states enable partial state identification without errors. Results include exact copy complexity for stabilizer states, SIC-POVMs, MUBs, and applications to quantum anomaly and changepoint detection.