32 citations · 93 across the 17 of their papers we have counts for
18 papers
Exact Temporal Criticalities of Entanglement and Negativity in Gaussian and Non-Gaussian Dissipative Kitaev Chains
Shrey Chowdhary, Sanket Chirame, Stephan Haas +1
When the two largest eigenvalues of an entanglement or negativity spectrum meet, the gap of the corresponding entanglement or negativity Hamiltonian closes while entropies stay smo…
Krylov Edge Spectroscopy of Symmetry-Protected Topological Phases
Heiko Georg Menzler, Rishabh Jha
We introduce , a many-body operator-space protocol for detecting and classifying one-dimensional symmetry-protected topological phases from local boun…
Many-Body Protection of Topological Edge Memory in Strong Interacting Quenches
Yuxiao Hang, Stephan Haas, Rishabh Jha
Quantum quenches drive edge states far from equilibrium, yet whether the memory of a topological initial state survives in a non-integrable, interacting system has remained largely…
Magic Without Entanglement: Exact Revivals and Their Fisher Information Origin
Rishabh Jha, Karun Gadge
Magic and entanglement are independent quantum resources, yet their exact relation in many-body dynamics has remained elusive. We uncover two structural principles. First, at any s…
CADRE: Stable, Parameter Efficient Adaptation of Medical Vision Language Models with Bounded Forgetting and Prior Drift
Rishabh Jha, Amrita Singh, Prashanna Chudal
Medical vision-language models (VLMs) such as BiomedCLIP generalize broadly, but adapting them to a clinical service is as much a safety problem as an accuracy one. Updating a depl…
Geometric Decoherence Time in Lindbladian Dynamics
Rishabh Jha, Stephan Haas, Abhinav Prem
The onset of decoherence in open many-body systems lacks a dynamical timescale grounded in the loss of bipartite entanglement. Here, we introduce the $tim…
Locked Subharmonic Oscillations in the Entanglement Spectrum of a Periodically Driven Topological Chain
Rishabh Jha
Periodically driven quantum systems can exhibit subharmonic response, usually characterized through physical observables and often discussed in interacting settings. Here we show t…
Long-Range Pairing in the Kitaev Model: Krylov Subspace Signatures
Rishabh Jha, Heiko Georg Menzler
Krylov subspace methods quantify operator growth in quantum many-body systems through Lanczos coefficients that encode how operators spread under time evolution. Although these dia…
Theory of Strongly Correlated Systems: An Introduction to Sachdev-Ye-Kitaev Model
Rishabh Jha
The Sachdev-Ye-Kitaev (SYK) model provides an analytically tractable framework for exotic strongly correlated phases where conventional paradigms like Landau's Fermi liquid theory…
Page Curve and Entanglement Dynamics in an Interacting Fermionic Chain
Rishabh Jha, Salvatore R. Manmana, Stefan Kehrein
Generic non-equilibrium many-body systems display a linear growth of bipartite entanglement entropy in time, followed by a volume law saturation. In stark contrast, the Page curve…
Thermalization of a Closed Sachdev-Ye-Kitaev System in the Thermodynamic Limit
Santiago Salazar Jaramillo, Rishabh Jha, Stefan Kehrein
The question of thermalization of a closed quantum system is of central interest in non-equilibrium quantum many-body physics. Here we present one such study analyzing the dynamics…
Current Correlations and Conductivity in SYK-Like Systems: An Analytical Study
Rishabh Jha, Stefan Kehrein, Jan C. Louw
We present a functional-based approach to compute thermal expectation values for actions expressed in the formalism, applicable to any time sequence ordering. Utilizing this…
Krylov Delocalization/Localization across Ergodicity Breaking
Heiko Georg Menzler, Rishabh Jha
Krylov complexity has recently gained attention where the growth of operator complexity in time is measured in terms of the off-diagonal operator Lanczos coefficients. The operator…
Thermodynamics and dynamics of coupled complex SYK models
Jan C. Louw, Linda M. van Manen, Rishabh Jha
It has been known that the large- complex SYK model falls under the same universality class as that of van der Waals (mean-field) and saturates the Maldacena-Shenker-Stanford bo…
Dynamics and Charge Fluctuations in Large-q Sachdev-Ye-Kitaev Lattices
Rishabh Jha, Jan C. Louw
It is known that the large- complex Sachdev-Ye-Kitaev (SYK) dot thermalizes instantaneously under rather general dynamical protocols. We consider a lattice of such dots coupled…
Introduction to Hamiltonian Formulation of General Relativity and Homogeneous Cosmologies
Rishabh Jha
We give a pedagogical introduction to the Hamiltonian formalism of general relativity at an advanced undergraduate and graduate levels. After covering the mathematical pre-requisit…
Massive Scattering Amplitudes in Six Dimensions
Rishabh Jha, Chethan Krishnan, K. V. Pavan Kumar
We show that a natural spinor-helicity formalism that can describe massive scattering amplitudes exists in dimensions. This is arranged by having helicity spinors carry an in…
Geometry of criticality, supercriticality and Hawking-Page transitions in Gauss-Bonnet-AdS black holes
Anurag Sahay, Rishabh Jha
We obtain the Ruppeiner geometry associated with the non-extended state space ( constant) of the charged Gauss-Bonnet AdS (GB-AdS) black holes and confirm that the state space R…