Papers
Locked Subharmonic Oscillations in the Entanglement Spectrum of a Periodically Driven Topological Chain
Rishabh Jha·Apr 8, 2026
Periodically driven quantum systems can exhibit subharmonic response, usually characterized through physical observables and often discussed in interacting settings. Here we show that a sharp subharmonic signature already appears in the entanglement ...
Quantum phases in the interacting generalized Su-Schrieffer-Heeger model
Jing-Hua Niu, Jia-Lin Liu, Ke Wang +2 more·Apr 7, 2026
We investigate the quantum phases of a half-filled generalized interacting Su-Schrieffer-Heeger model with intracell, nearest-neighbor, and next-nearest-neighbor intercell hoppings, together with an on-site inter-sublattice interaction. In the nonint...
Adaptive Deformation of Color Code in Square Lattices with Defects
Tian-Hao Wei, Jia-Xuan Zhang, Jia-Ning Li +3 more·Apr 7, 2026
Quantum error correction is a crucial technology for fault tolerant quantum computing. On superconducting platforms, hardware defects in large scale quantum processors can disrupt the regular lattice structure of topological codes and impair their er...
A Global Model Structure for $\mathbb{K}$-Linear $\infty$-Local Systems
Hisham Sati, Urs Schreiber·Apr 7, 2026
Parameterized stable homotopy theory organizes local systems of spectra over homotopy types, governed by a "yoga" of six functors. To provide semantics for the recently developed Linear Homotopy Type Theory (LHoTT), good model categories of these spe...
Post-Selection-Free Decoding of Measurement-Induced Area-Law Phases via Neural Networks
Hui Yu, Jiangping Hu, Shi-Xin Zhang·Apr 4, 2026
Monitored quantum circuits host a rich variety of exotic non-equilibrium phases. Among the most representative examples are measurement-induced phase transitions between distinct area-law entangled states. However, because these transitions are chara...
Non-reciprocal Ising gauge theory
Nilotpal Chakraborty, Anton Souslov, Claudio Castelnovo·Apr 3, 2026
Non-reciprocity and geometric frustration enable many-body systems to avoid crystalline order and instead exhibit complex, liquid-like behavior. Here we show that their interplay is richer than the sum of its parts, leading to surprising structural a...
Quantum Contact Processes on a Topological Lattice
Julius Bohm, Richard Schmidt, Michael Fleischhauer +1 more·Apr 3, 2026
Contact processes play an important role in classical non-equilibrium dynamics, describing the spreading of diseases, the dynamics of earthquakes and forest fires, and the distribution of information through the internet. Here we show that their quan...
High-threshold decoding of non-Pauli codes for 2D universality
Julio C. Magdalena de la Fuente, Noa Feldman, Jens Eisert +1 more·Apr 2, 2026
Topological codes have many desirable properties that allow fault-tolerant quantum computation with relatively low overhead. A core challenge for these codes, however, is to achieve a low-overhead universal gate set with limited connectivity. In this...
Transversal non-Clifford gates on almost-good quantum LDPC and quantum locally testable codes
Yiming Li, Zimu Li, Zi-Wen Liu·Apr 2, 2026
We exhibit nontrivial transversal logical multi-controlled-$Z$ gates on $[\![N,Θ(N),\tildeΘ(N)]\!]$ quantum low-density parity-check codes and $[\![N,Θ(N),\tildeΘ(N)]\!]$ quantum locally testable codes with soundness $\tildeΘ(1)$, combining nearly op...
Codimension-controlled universality of quantum Fisher information singularities at topological band-touching defects
C. A. S. Almeida·Apr 2, 2026
Topological phase transitions in generic multiband systems are mediated by band-touching defects whose codimension -- the number of momentum directions along which the gap closes linearly -- varies across universality classes. Although singular behav...
The effect of staggered nonlinearity on the Su-Schrieffer-Heeger model
Ahmed Alharthy, RW Bomantara·Apr 1, 2026
We investigate the spectral properties of the Su-Schrieffer-Heeger (SSH) model with sublattice-dependent onsite nonlinearity. Two complementary approaches are employed in our studies. First, Bloch state solutions under periodic boundary conditions ar...
Probing topological edge states in a molecular synthetic dimension
Adarsh P. Raghuram, Francesca M. Blondell, Jonathan M. Mortlock +7 more·Apr 1, 2026
Engineering synthetic dimensions, where the physics of additional spatial dimensions is simulated within the internal states of a quantum system, allows the realisation of phenomena not otherwise accessible in experiments. Ultracold ground-state pola...
Nonlinearity-Induced Thouless Pumping in Quasiperiodic Lattices
Xiao-Xiao Hu, Dun Zhao, Hong-Gang Luo·Apr 1, 2026
Nonlinear Thouless pumping has been established in periodic lattices; its counterpart in quasiperiodic lattices remains unexplored. Here, we show a nonlinear topological pumping of gap solitons in quasiperiodic lattices where the local nonlinear self...
Braiding and exchange statistics of liquid crystalline Majorana quasiparticles
A. I. Tóth, G. Negro, A. D. Huxley +1 more·Apr 1, 2026
Liquid crystalline defects in 3D can be viewed as geometric spinors, whose emergent properties are reminiscent of those of topological excitations in quantum condensed matter, such as Majorana quasiparticles. However, it is unclear how deep this anal...
Inverse Design of Strongly Localized Topological $π$ Modes in One-Dimensional Nonperiodic Systems
Fumitatsu Iwase·Mar 31, 2026
This study investigates the spatial confinement of topological $π$-modes in one-dimensional chiral-symmetric systems. In conventional periodic and quasiperiodic structures, edge-mode wave functions inevitably penetrate the bulk. To suppress this, inv...
Topological sum rule for geometric phases of quantum gates
Nadav Orion, Boris Rotstein, Nirron Miller +1 more·Mar 31, 2026
We establish a topological sum rule, $ν_U = \frac{1}{2π}\sum_nγ_n = 2mν_H$, connecting the geometric phases accumulated by a two-qubit system over a complete basis of initial states to the winding number $ν_H$ classifying its Hamiltonian. Implementat...
Quantum connectivity of quantum networks
Md Sohel Mondal, Shashank Shekhar, Siddhartha Santra·Mar 31, 2026
The practical utility of a quantum network depends on its ability to establish entanglement between arbitrary node pairs with quality sufficient to execute entanglement enabled tasks. This capability can be assessed globally, through aggregate perfor...
Entanglement between an NV Center and Chiral Photons in a Topological SWCNT Plasmonic Microtoroid
Fang-Yu Hong·Mar 31, 2026
We present a theoretical proposal for a hybrid solid-state quantum node based on a single nitrogen-vacancy (NV) center coupled to a topological single-walled carbon nanotube (SWCNT) plasmonic microtoroid. The SWCNT ring supports deeply sub-wavelength...
Entanglement in the $θ$-vacuum
Sebastian Grieninger, Dmitri E. Kharzeev, Eliana Marroquin·Mar 31, 2026
We compute the entanglement entropy and the entanglement spectrum of the vacuum state in the massive Schwinger model at a finite $θ$ angle. The $θ$ term is implemented through a chirally rotated lattice Hamiltonian that preserves the periodicity in $...
Topological Optical Chirality Dichroism
Wojciech J. Jankowski, Giandomenico Palumbo, Robert-Jan Slager·Mar 30, 2026
We report on a universal topological dichroism of chiral three-dimensional systems in response to the chirality of light. We show that chiral topological invariants result in integer-quantized dichroic excitation rate differences. Moreover, we demons...