News

Oct 15, 2026 New preprint with Tai-Hsuan Yang, Andrew D. Kim and Akash Vijay: Stability of Quantum LDPC States under Local Pauli Noise — Proves that the code-space state of any qLDPC code stays stable under local Pauli noise: its conditional mutual information decays exponentially across a buffer, at both weak and strong noise.
Oct 14, 2026 New preprint with Yuta Hirasaki: Logical CCZ state cultivation — Logical CCZ states enable Toffoli gates, a central building block of fault-tolerant quantum arithmetic.
Oct 08, 2026 New preprint with Akash Vijay: Short-Range Vector Spin Glasses: Parisi Hierarchies and Real-Space Ultrametricity — A local lattice model of vector spins that, at large N, hosts stable one-step and full Parisi replica-symmetry-breaking phases, with the Parisi hierarchy showing up directly as correlation lengths in real space.
Oct 05, 2026 New preprint: Designing Group-Valued Codes with Full Regular Low-Weight Bases — Efficient fault-tolerant quantum computing architectures benefit from low-weight logical operators.
Oct 02, 2026 Jong Yeon is one of five Software Track winners of Microsoft’s Quantum Pioneers Program, for the project From Logical Spectroscopy to Hardware-Aware qLDPC Compilation, which builds on the group’s work on logical spectroscopy. The award comes with a $200,000 gift from Microsoft.
Oct 02, 2026 Published in Physical Review X with Tai-Hsuan Yang and Bowen Shi: Topological Mixed States: Phases of Matter from Axiomatic Approaches — a definition of mixed-state topological phases built from entanglement-bootstrap stability axioms. Read the Illinois Physics story, Classifying non-equilibrium phases of matter.
Sep 24, 2026 New preprint: Design Principles for Ultra-High-Rate Quantum Codes — Design rules for compact quantum LDPC codes, with column weight as the key knob, giving codes such as [[90,21,11]] and [[200,43,20]] that need only a few physical qubits per logical qubit.
Sep 22, 2026 New preprint with Jintae Kim and Bowen Shi: Transparent Domain Walls through Information Convex Sets — An entanglement-bootstrap method that reads off ‘transparent’ domain walls in topological phases, including their effect on ground-state degeneracy and anyon transmutation, directly from ground-state wavefunctions on a torus.
Sep 10, 2026 New preprint with Akash Vijay: Hierarchy of Rényi Coherent Information in Stabilizer Codes — Proves that the Rényi coherent information of stabilizer codes under Pauli noise never decreases with the Rényi index, and gives it an operational meaning through syndrome postselection.
Aug 06, 2026 New preprint with Bowen Shi: Approximate Quantum Error Correction at Chiral Topological Edges — The chiral edges of topological phases act as approximate quantum error-correcting codes, with coherent-information loss set by universal edge properties and power-law-range recovery maps.
Jul 30, 2026 New preprint with Yuta Hirasaki: Lifting Lifted Product Codes — Builds families of lifted-product codes from group extensions and graph lifts, improving code parameters and carrying code-surgery gadgets across a family through chain maps.
Jul 22, 2026 New preprint: Monte Carlo Studies of Twisted Bilayer Graphene: Strain and Thermal Fluctuations — Sign-problem-free quantum Monte Carlo maps the phase diagram of twisted bilayer graphene versus twist angle, strain and temperature, from a Dirac semimetal to the Kramers intervalley-coherent phase.
Jul 09, 2026 Jong Yeon co-organized the international workshop Quantum Information and Dynamics 2026: qLDPC Theory and Application at KIAS in Seoul, Korea (July 6–9), with Isaac H. Kim (UC Davis & KIAS) and Hyukjoon Kwon (KIAS). Recorded talks are available on the KIAS School of Physics YouTube channel.
Jul 06, 2026 New preprint: Logical Spectroscopy: Lifted-Product Codes with Addressable Bases — Splits the group algebra of Abelian lifted-product codes into finite-field ‘packets’ to produce a complete, addressable basis of logical operators for codes with thousands of qubits.
May 06, 2026 New preprint: Charge Scrambling in Strong-to-Weak Spontaneous Symmetry Breaking — Shows when strong-to-weak symmetry breaking forces extensive charge fluctuations, and introduces a twist-overlap correlator that separates coherent from incoherent charge fluctuations.
Feb 03, 2026 New preprint with Andrew D. Kim: Liouvillian Gap in Dissipative Haar-Doped Clifford Circuits — How much randomness a Clifford circuit needs before weak dissipation produces an intrinsic relaxation rate: a crossover controlled by the spatial pattern of the Haar-random gates.
Dec 26, 2025 New preprint with Akash Vijay: Information Critical Phases under Decoherence — Decohered Z_N toric codes with N > 4 host an ‘information critical phase’ with a diverging Markov length, where a finite fraction of the logical information survives between the decodable and non-decodable phases.
Nov 26, 2025 New preprint with Akash Vijay: Holographically Emergent Gauge Theory in Symmetric Quantum Circuits — A holographic view of symmetric random circuits: averaging out the non-symmetric part yields a noisy Z_N surface code, and the charge-sharpening transition becomes a confinement transition of the emergent gauge theory.
Jun 27, 2025 Jong Yeon organized the international workshop Quantum Information and Dynamics 2025 in Seoul, Korea (June 23–27). Recorded talks are available on the workshop’s YouTube channel.
May 22, 2024 Congratulations to Olumakinde Ogunnaike on successfully defending his thesis, and on his upcoming role as a Presidential Postdoctoral Fellow at UC Berkeley!