Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Entanglement of Nanophotonic Quantum Memory Nodes Via 35 km of Deployed Fiber

Can M. Knaut, Aziza Suleymanzade, Yan-Cheng Wei, Daniel Assumpção, Pieter-Jan Stas, Yan Qi Huan, Bartholomeus Machielse, Erik Knall, Madison Sutula, Gefen Baranes, Neil E. Sinclair, Chawina De-Eknamkul, David Levonian, Mihir K. Bhaskar, Hongkun Park, Marko Lončar, Mikhail D. Lukin

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We generate remote entanglement between spatially separate color-center based nanophotonic quantum network nodes. In addition, we demonstrate remote entanglement distribution across a 35 km long fiber loop deployed in the Boston urban area.
DOI
10.1364/cleo_fs.2024.fth5b.3

Related papers

Remote Entanglement of Quantum Memories over a Metropolitan Network

Daniel Assumpção, Can M. Knaut, Aziza Suleymanzade +14 more

We generate remote entanglement between spatially separate color-center based quantum nodes at rates up to 1 Hz. In addition, we demonstrate remote entanglement across a deployed 35km long fiber loop in the Boston urban area.

Optical Fiber Communication Conference•Jan 1, 2024•0 citations

Entanglement of nanophotonic quantum memory nodes in a telecom network

Can M. Knaut, Aziza Suleymanzade, Yan-Cheng Wei +14 more

Abstract A key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected by fibre optical infrastructure1–3. Here we demonstrate a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centres in nanophotonic diamond cavities integrated with a telecommunication fibre network. Remote entanglement is generated by the cavity-enhanced interactions between the electron spin qubits of the SiVs and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used to provide second-long entanglement storage and integrated error detection. By integrating efficient bidirectional quantum frequency conversion of photonic communication qubits to telecommunication frequencies (1,350 nm), we demonstrate the entanglement of two nuclear spin memories through 40 km spools of low-loss fibre and a 35-km long fibre loop deployed in the Boston area urban environment, representing an enabling step towards practical quantum repeaters and large-scale quantum networks.

arXiv:2310.01316•Nature•May 15, 2024•310 citations

Towards a Long Distance Memory Assisted Quantum Repeater

Chase Wallace, Tsering Lodhen, Leonardo Castillo-Veneros +7 more

We report our progress towards performing memory-assisted entanglement swapping using deployed fiber in a five-node 259 km network testbed. Our quantum repeater testbed is envisioned to push beyond the PLOB boundary of repeaterless networks.

Quantum 2.0 Conference and Exhibition•Jan 1, 2024•1 citation

Towards Entanglement Swapping over 250 km of Deployed Fiber

Chase Wallace, Tsering Lodhen, Leonardo Castillo-Veneros +7 more

We report our progress towards performing entanglement swapping using deployed fiber in a five-node 259 km network testbed connecting Long Island and New York City.

Quantum 2.0 Conference and Exhibition•Jan 1, 2025•0 citations

Entanglement Distribution for Metropolitan-scale Quantum Networks with Classical Coexistence

A. Rahmouni, Paulina S. Kuo, Yu Shi +9 more

We achieved successful polarization entanglement distribution in metropolitan-scale quantum networks, coexisting with classical systems. We utilized deployed fiber infrastructure across the NIST campus and extended the distance to over 100 km using fiber spools.

•Jan 1, 2024•0 citations

Trapped-ion-based quantum repeater node across a 17 km metropolitan fiber

K. Fabitha, T. Runggaldier, A. Winkler +7 more

Concatenation of quantum repeater nodes has been proposed as a means to distribute entanglement efficiently across future long-distance networks. Here, we demonstrate a trapped-ion repeater node that establishes photonic entanglement over a 17 km fiber traversing a city, moving beyond laboratory-only prototypes. The node comprises two atomic ions coupled to an optical cavity. First, a detailed characterization is performed of the long fiber channel and of ion-photon entanglement distributed across it. Next, a repeater-node protocol is implemented, achieving entanglement between a local photon and a remote photon with a Bell-state fidelity of $81.6^{+1.9}_{-1.4}\%$. These results demonstrate that trapped-ion repeater-node technology can operate over existing city-scale fiber infrastructure and represent a step toward distributed quantum repeater networks.

quant-pharXiv:2610.27854•Oct 21, 2026•0 citations
Abstract A key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected by fibre optical infrastructure1–3. Here we demonstrate a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centres in nanophotonic diamond cavities integrated with a telecommunication fibre network. Remote entanglement is generated by the cavity-enhanced interactions between the electron spin qubits of the SiVs and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used to provide second-long entanglement storage and integrated error detection. By integrating efficient bidirectional quantum frequency conversion of photonic communication qubits to telecommunication frequencies (1,350 nm), we demonstrate the entanglement of two nuclear spin memories through 40 km spools of low-loss fibre and a 35-km long fibre loop deployed in the Boston area urban environment, representing an enabling step towards practical quantum repeaters and large-scale quantum networks.
Concatenation of quantum repeater nodes has been proposed as a means to distribute entanglement efficiently across future long-distance networks. Here, we demonstrate a trapped-ion repeater node that establishes photonic entanglement over a 17 km fiber traversing a city, moving beyond laboratory-only prototypes. The node comprises two atomic ions coupled to an optical cavity. First, a detailed characterization is performed of the long fiber channel and of ion-photon entanglement distributed across it. Next, a repeater-node protocol is implemented, achieving entanglement between a local photon and a remote photon with a Bell-state fidelity of 81.6−1.4+1.9%81.6^{+1.9}_{-1.4}\%81.6−1.4+1.9​%. These results demonstrate that trapped-ion repeater-node technology can operate over existing city-scale fiber infrastructure and represent a step toward distributed quantum repeater networks.