dorsal/arxiv
View SchemaRealization of decoherence-free subspace using Multiple-Quantum coherences
| Authors | Daxiu Wei, Jun Luo, Xianping Sun, Xizhi Zeng, Mingsheng Zhan, Maili Liu |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0410140 |
| URL | https://arxiv.org/abs/quant-ph/0410140 |
| DOI | 10.1103/PhysRevLett.95.020501 |
Abstract
This letter presents a two-dimensional nuclear magnetic resonance(NMR) approach for constructing a two-logical-qubit decoherence-free subspace (DFS) based on the fact that the three protons in a CH3 spin system can not be resolved in one-dimension NMR spectroscopy, but to a certain extent, can be distinguished by two-dimensional multiple-quantum NMR. We used four noisy physical nuclear spins, including three protons and one carbon in the CH3 spin system, to generate two decoherence-free logical quantum bits. It made full use of the unaddressed spins which could not be used in one-dimensional spectrum. Furthermore, we have experimentally demonstrated such an approach. Our experimental results have shown that our DFS can protect against far more types of decoherence than the one composed of four noisy physical qubits all with different chemical shifts. More importantly, this idea may provide new insights into extending qubit systems in the sense that it effectively utilizes the magnetically equivalent nuclei.
{
"annotation_id": "1aed2cc8-58ce-483c-bf78-398857f8d57a",
"date_created": "2026-03-02T18:02:10.393000Z",
"date_modified": "2026-03-02T18:02:10.393000Z",
"file_hash": "a585f30b23b361f7681911f29d1f024e4c13dd9d8269b3f811ac435b83596324",
"private": false,
"record": {
"abstract": "This letter presents a two-dimensional nuclear magnetic resonance(NMR)\napproach for constructing a two-logical-qubit decoherence-free subspace (DFS)\nbased on the fact that the three protons in a CH3 spin system can not be\nresolved in one-dimension NMR spectroscopy, but to a certain extent, can be\ndistinguished by two-dimensional multiple-quantum NMR. We used four noisy\nphysical nuclear spins, including three protons and one carbon in the CH3 spin\nsystem, to generate two decoherence-free logical quantum bits. It made full use\nof the unaddressed spins which could not be used in one-dimensional spectrum.\nFurthermore, we have experimentally demonstrated such an approach. Our\nexperimental results have shown that our DFS can protect against far more types\nof decoherence than the one composed of four noisy physical qubits all with\ndifferent chemical shifts. More importantly, this idea may provide new insights\ninto extending qubit systems in the sense that it effectively utilizes the\nmagnetically equivalent nuclei.",
"arxiv_id": "quant-ph/0410140",
"authors": [
"Daxiu Wei",
"Jun Luo",
"Xianping Sun",
"Xizhi Zeng",
"Mingsheng Zhan",
"Maili Liu"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.95.020501",
"title": "Realization of decoherence-free subspace using Multiple-Quantum coherences",
"url": "https://arxiv.org/abs/quant-ph/0410140"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "33e4aee0-d0b3-473e-8b83-c3894274d081",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}