Compression of Entanglement Improves Quantum Communication
Abstract Shared entanglement can significantly amplify classical correlations between systems interacting over a limited quantum channel. A natural avenue is to use entanglement of the same dimension as the channel because this allows for unitary encodings, which preserve global coherence until a measurement is performed. Contrasting this, a distributed task based on a qubit channel is demonstrated, for which irreversible encoding operations can outperform any possible coherence‐preserving protocol. This corresponds to using high‐dimensional entanglement and encoding information by compressing one of the subsystems into a qubit. Demonstrating this phenomenon requires the preparation of a 4D maximally entangled state, the compression of two qubits into one and joint qubit‐ququart entangled measurements, with all modules executed at near‐optimal fidelity. A proof‐of‐principle experiment is reported that achieves the advantage by realizing separate systems in distinct and independently controlled paths of a single photon. This result demonstrates the relevance of high‐dimensional entanglement and non‐unitary operations for enhancing the communication capabilities of standard qubit transmissions.
Authors
- Yun‐Feng Huang
- Chuan‐Feng Li (ORCID: https://orcid.org/0000-0001-6815-8929)
- Bi‐Heng Liu (ORCID: https://orcid.org/0000-0002-4569-7716)
- Armin Tavakoli (ORCID: https://orcid.org/0000-0001-9136-7411)
- Emmanuel Zambrini Cruzeiro (ORCID: https://orcid.org/0000-0003-3418-9131)
- Jef Pauwels (ORCID: https://orcid.org/0000-0003-4440-7411)
- Yu Guo (ORCID: https://orcid.org/0000-0002-1962-7343)
- Hao Tang (ORCID: https://orcid.org/0000-0002-6877-0226)
- Xiao‐Min Hu (ORCID: https://orcid.org/0000-0001-8424-187X)
- Guang‐Can Guo
Institutions
- University of Science and Technology of China (CN)
- Université Libre de Bruxelles (BE)
- Lund University (SE)
- Instituto de Telecomunicações (PT)
- Instituto Superior Técnico (PT)
Publication Details
- Journal
- Laser & Photonics Review
- Published
- 2025-02-16
- DOI
- https://doi.org/10.1002/lpor.202401110
- Citations
- 3
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 7.44
Funders
- Wenner-Gren Foundation
- European Commission
- National Natural Science Foundation of China
- Fonds De La Recherche Scientifique - FNRS
- China Postdoctoral Science Foundation
- Fonds Wetenschappelijk Onderzoek
- Knut och Alice Wallenbergs Stiftelse
- Ministério da Ciência, Tecnologia e Ensino Superior
- University of Science and Technology of China
- QuantERA
- HORIZON EUROPE Framework Programme
- Fundação para a Ciência e a Tecnologia
- Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
- Natural Science Foundation of Anhui Province
- National Postdoctoral Program for Innovative Talents
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities
- Wallenberg Center for Quantum Technology, Chalmers University of Technology