Quantum repeaters based on trapped ions with decoherence-free subspace encoding
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Quantum repeaters provide an efficient solution to distribute Bell pairs over arbitrarily long distances. While scalable architectures are demanding regarding the number of qubits that need to be controlled, here we present a quantum repeater scheme aiming to extend the range of present day quantum communications that could be implemented in the near future with trapped ions in cavities. We focus on an architecture where ion-photon entangled states are created locally and subsequently processed with linear optics to create elementary links of ion-ion entangled states. These links are then used to distribute entangled pairs over long distances using successive entanglement swapping operations performed using deterministic ion-ion gates. We show how this architecture can be implemented while encoding the qubits in a decoherence-free subspace to protect them against collective dephasing. This results in a protocol that can be used to violate a Bell inequality over distances of about 800 km assuming state-of-the-art parameters. We discuss how this could be improved to several thousand kilometres in future setups.
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This capability provides a route to robust logical qubit encodings at network nodes, separate communication and information processing functionalities within each node, and quantum repeaters requiring Bell state measurements and either purification or error correction.
“This capability provides a route to robust logical qubit encodings at network nodes [64], separate communication and information processing functionalities within each node [5,21], and quantum repeaters requiring Bell state measurements and either purification or error correction [65].”
From Entanglement of Trapped-Ion Qubits Separated by 230 Meters (2023) · cites this paper as [65]
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- Authors
- Zwerger, M., Lanyon, B. P., Northup, T. E., Muschik, C. A., Dür, W., & Sangouard, N.
- Affiliations
- University of Basel (CH)
- Austrian Academy of Sciences (AT)
- Universität Innsbruck (AT)
- Corresponding author
- Zwerger, M
- Lanyon, B P
- Northup, T E
- Muschik, C A
- Dür, W
- Sangouard, N
- Venue
- Quantum Science and Technology
- Publisher
- IOP Publishing
- Published
- 2017-08-04
- Volume
- 2
- Issue
- 4
- Pages
- 044001
- ISSN
- 2058-9565 (ISSN-L)
- OpenAlex
- W2963409549
- Cited by
- 23
- References
- 51
- Citations by year
- 2026: 1 · 2024: 3 · 2023: 5 · 2022: 1 · 2021: 4 · 2020: 2 · 2019: 2 · 2018: 3 · 2017: 1 · 2016: 1
- FWCI
- 1.31
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Quantum Science and Technology (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Army Research Laboratory (Scinet)
- European Union (SIQS)
- Austrian Science Fund (P28000 - N27)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PP00P2- 150579)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
- Keywords
- quantum repeaters, trapped ions, decoherence-free subspace, ion-photon entanglement, entanglement swapping, collective dephasing, Bell inequality violation, long-distance quantum communication, linear optics, cavity quantum electrodynamics
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