Long-time storage of entangled logical states in decoherence-free subspaces
Abstract
The maintenance of quantum entanglement lays the elementary building block of quantum information processing, requiring an integration of long coherence time, sufficient storage capacity, and high-fidelity entangling gates. Here we encode two-qubit entangled states into the decoherence-free subspaces (DFS) of four ions in a cryogenic trap. By crosstalk-free sympathetic cooling under dual-type encoding and multi-state detection which discards the collision-induced leakage error, we achieve a storage lifetime of about one hour for the entangled logical states. We further study the second-order DFS and show its advantage in suppressing the spatially nonuniform noise over the first-order DFS. Our work paves the way for applications of DFS quantum memories in quantum computing, quantum network and precision measurement.
Keywords
Cite
@article{arxiv.2603.07190,
title = {Long-time storage of entangled logical states in decoherence-free subspaces},
author = {L. Zhang and Y. -L. Xu and Y. -K. Wu and C. Zhang and Z. -B. Cui and Y. -Y. Chen and W. -Q. Lian and J. -Y. Ma and B. -X. Qi and Y. -F. Pu and Z. -C. Zhou and L. He and P. -Y. Hou and L. -M. Duan},
journal= {arXiv preprint arXiv:2603.07190},
year = {2026}
}