New proof establishes the existence of ghost r-SICs—equichordal subspace configurations—by extending the twisted convolution identity to rank-r structures using finite quantum dilogarithm theory.
@informaq.bsky.social
@informaq.bsky.socialNew proof establishes the existence of ghost r-SICs—equichordal subspace configurations—by extending the twisted convolution identity to rank-r structures using finite quantum dilogarithm theory.
@informaq.bsky.socialA hybrid nanophotonic trap using Casimir-Polder interactions and electrostatic forces instead of laser fields achieves record storage and coherence times for cold atoms, advancing quantum information systems.
@informaq.bsky.socialProves parallel Kac's walk achieves rapid mixing on Stiefel manifolds in O((k+log d)log(d/ε)) steps, extending results from single quantum states to multiple orthonormal states with applications to quantum cryptography and pseudorandom unitaries.
@informaq.bsky.socialFirst commuting operator self-test for exact entanglement embezzlement with no tensor-product realization. Combines Feige's game with tilted CHSH in novel framework requiring infinite-dimensional shared resource space.
@informaq.bsky.socialDetermines when quantum symmetry testing can be performed optimally without quantum resources like coherence. Derives quantitative representation-theoretic bounds showing which resources are genuinely necessary for different symmetry subgroups.
@informaq.bsky.socialProves determining whether quantum parameter estimation can achieve fundamental precision limits is computationally intractable (NP-hard), revealing a fundamental obstruction explaining 60+ years of unsolved quantum metrology challenges.
@informaq.bsky.socialResearchers establish how fermionic non-local magic scales in higher dimensions through entanglement spectrum analysis, with bounds connecting magic to capacity of entanglement and applications to topological phases.
@informaq.bsky.socialResearchers develop an experimentally efficient framework for quantifying non-Markovianity using witness operators, reducing measurement overhead from 15 parameters to just 1-3 correlation measurements while maintaining rigor.
@informaq.bsky.socialProved approximate majorization for quantum depolarizing channels, yielding tight third-order classical capacity expansion. Entangled codewords provide only O(log log n) bit advantage over product coding strategies in finite-blocklength regime.
@informaq.bsky.socialFirst provably untelegraphable quantum fire in standard model using one-shot signatures. Introduces conversable fire: cloneable quantum states transmissible via interactive classical communication despite one-way untelegraphability.
@informaq.bsky.socialProves that Gaussian states dominating nonzero separable operators must themselves be separable, settling the conjecture that full inseparability and genuine multipartite entanglement coincide for finite-mode quantum systems.
@informaq.bsky.socialResearchers develop a rigorous framework quantifying time-reversal violation in quantum channels, decomposing it into kinematic T-violation and thermodynamic nonunitality, and proving universal golden units exist for resource conversion.
@informaq.bsky.socialIntroduces a universal correlation index for measuring quantum and classical correlations in equilibrium and nonequilibrium statistical systems, including entanglement in multipartite quantum states.
@informaq.bsky.socialQuantum theory achieves perfect success in a parity-oblivious communication task where all preparation-noncontextual models fail. This all-vs-nothing separation demonstrates fundamental quantum contextuality advantages in information processing.
@philosophies-de.bsky.social
@tenuretracker.bsky.social@informaq.bsky.socialProved that regularized stabilized sandwiched Rényi divergences converge to regularized relative entropy as order approaches one, with applications to quantum channel discrimination and asymptotic equipartition.
@informaq.bsky.socialQuantum entangled states can serve as associative memory with cubic capacity scaling, outperforming classical Hopfield networks through quantum effects in valence-bond solid states.
@informaq.bsky.socialMathematical framework for optimal entanglement detection using finitely many quantum state invariants. Even singular-value moments of realignment are tensor trace invariants, enabling efficient certification of PPT-entangled quantum states.
@informaq.bsky.socialNovel smoothed approximation to the Entanglement of Formation enables tractable computation of this fundamental quantum entanglement measure with quantifiable accuracy bounds.