Quantum Capacitance as a Probe for Non-Hermiticity in Dirac Materials

Quantum capacitance reveals non-Hermitian physics in graphene through universal thermodynamic signatures at exceptional points, offering new experimental routes to probe quantum materials with balanced gain and loss.

#NonHermitian #QuantumMaterials #Graphene

Critical Timescale Formula Derived for Non-Hermitian Parametric Transitions

A closed-form formula T_cr = G·ln(1/|Δ|) precisely predicts non-adiabatic transition timescales in non-Hermitian systems. Critical timescale scales with precision bits, linking computational limits to chirality onset and precision-induced irreversibility.

#NonHermitian #ExceptionalPoints #News

Transformer-Based Geometric Tomography of Complex-Energy Braiding Topology in a Dissipative BEC Simulator

A Transformer ML model achieves 99.93% accuracy classifying complex-energy braiding topology in dissipative BEC experiments, autonomously identifying band crossings as key geometric features—bridging non-Hermitian topology and quantum ML.

#QuantumTopology #NonHermitian #QuantumML

Many-Body Non-Hermitian Skin Effect Exhibits Multifractal Hilbert Space Structure

Kyoto University researchers show the many-body skin effect displays multifractality in Hilbert space—not real space—coexisting with random-matrix spectral statistics, marking a novel dissipative quantum-chaotic regime distinct from many-body localization.

#OpenQuantumSystems #NonHermitian #News

Non-Hermitian Models Reveal Exceptional Points in Two-Qubit Heat Flow

Researchers at Università di Napoli Federico II show exceptional points emerge in two-qubit systems under strong nonequilibrium heat flow via local master equations—no postselection required—pointing to circuit-QED platforms for experimental verification.

#NonHermitian #QuantumSensing #News

Symmetry Constraints Limit Non-Hermitian Exceptional Points to Half-Order Branch Points

Researchers at Shiv Nadar IoE show PT-symmetric systems achieve ε^(1/3) eigenvalue splitting at 3rd-order exceptional points—the strongest possible singularity—enabling precision sensor design via Puiseux series and Jordan-normal basis frameworks.

#NonHermitian #ExceptionalPoints #News

End-to-End Quantum Estimation of Non-Hermitian Pseudospectra

QMA-complete pseudospectrum membership for 4-local operators solved via QSIGS (Heisenberg-limited singular-value estimation) + Lindbladian state prep, demonstrated on IonQ trapped-ion hardware near an exceptional point.

#QuantumComputing #NonHermitian #Research

Tunably realizing flat-bands and exceptional points in kinetically frustrated systems: An example on the non-Hermitian Creutz ladder
Debashish Dutta, Sayan Choudhury
Paper
Details
#NonHermitian #TopologicalPhysics #FrustratedLattice

A privilege to speak at Perspectives in Non-Hermitian Systems in San Sebastián last week—beautiful city & inspiring event! Shared new results on non-Hermitian quantum dynamics w/ Karin Nakanishi, Nicolò Defenu & R. Chitra. Thanks to the organizers! 🌊✨ #QuantumPhysics #NonHermitian #Research #Quantum

Non-Hermitian Quantum Metrology Enhancement and Skin Effect Suppression in PT-Symmetric Bardeen-Cooper-Schrieffer Chains We outline a theoretical framework for quantum metrology in non-Hermitian systems, demonstrating both significant failure and exceptional regimes in PT-symmetric Bardeen-Cooper-Schrieffer chains. Thro...

Can non-Hermitian physics boost quantum metrology or kill it? Our new arXiv work on PT-symmetric BCS chains explores both extremes.
Open to feedback, critiques, and collaboration ideas from across physics! arxiv.org/abs/2508.04815 #QuantumMetrology #NonHermitian #PTSymmetry #physics

Metric-induced nonhermitian physics I consider the long-standing issue of the hermicity of the Dirac equation in curved spacetime metrics. Instead of imposing hermiticity by adding ad hoc terms, I renormalize the field by a scaling func...

New paper! Uncovering the link between spacetime metrics & nonhermitian physics! Contractions/expansions of spacetime correspond to gain/loss nonhermitian processes and nonunitary dynamics ⚛️
arxiv.org/abs/2412.14250
#nonhermitian #quantumgravity #Quantum #arxiv #physics ⚛️

Schematics showing a visualization of an electromagnetic field distribution at an exceptional point, as well as a contour integral used for its computation.

Stable and accurate computation of eigenfrequency sensitivities near exceptional points, #nonHermitian systems #photonics #directDifferentiation @zuseinstitute.bsky.social @felixbinkowski.bsky.social #PhysRevResearch dx.doi.org/10.1103/Phys...