3 papers
quant-ph2026
Transversal dimension jump for product qLDPC codes
Christine Li, John Preskill, Qian Xu
We introduce transversal dimension jump, a code-switching protocol for lifted product (LP) quantum low-density parity-check (qLDPC) codes across different chain-complex dimensions,…
quant-ph2026
Achieving the Heisenberg limit using fault-tolerant quantum error correction
Himanshu Sahu, Qian Xu, Sisi Zhou
Quantum effect enables enhanced estimation precision in metrology, with the Heisenberg limit (HL) representing the ultimate limit allowed by quantum mechanics. Although the HL is g…
quant-ph2025
Batched high-rate logical operations for quantum LDPC codes
Qian Xu, Hengyun Zhou, Dolev Bluvstein +5
High-rate quantum LDPC (qLDPC) codes reduce memory overhead by densely packing many logical qubits into a single block of physical qubits. Here we extend this concept to high-rate…