A passive self-correcting quantum memory in three dimensions
2026-05-11 • Information Theory
Information Theory
AI summaryⓘ
The authors designed a special 3D quantum system that can store a single qubit of information reliably for a very long time, even when it's interacting with some environment at a non-zero temperature. They started with a basic quantum setup and repeatedly improved it using specific steps to make the qubit's memory last longer. Their method keeps the system organized in a way that fits naturally in three-dimensional space. This work focuses on protecting quantum information against errors caused by the environment.
Pauli stabilizer Hamiltonian3D quantum systemqubit encodingquantum memory lifetimegeometric localityquantum error correctionground state spacequantum baththermal noise
Authors
Shankar Balasubramanian, Margarita Davydova, Ting-Chun Lin
Abstract
We construct a 3D Pauli stabilizer Hamiltonian whose ground state space can encode a qubit for exponential time when coupled to a bath at non-zero temperature. Our construction recursively applies a sequence of transformations to a seed Hamiltonian that increases the memory lifetime of the encoded qubit while maintaining geometric locality in $\mathbb{R}^3$.