Hybrid Quantum Repeater Chains with Semiconductor Quantum Dots and Group-IV-Vacancy Color Centers in Diamond

• URL: http://arxiv.org/abs/2511.02472v1
• Date: Tue, 04 Nov 2025 10:58:57 GMT
• Title: Hybrid Quantum Repeater Chains with Semiconductor Quantum Dots and Group-IV-Vacancy Color Centers in Diamond
• Authors: Yannick Strocka, Fenglei Gu, Gregor Pieplow, Johannes Borregaard, Tim schröder,
• Abstract summary: We propose and analyze a hybrid quantum repeater architecture that combines two leading hardware platforms.<n>A key challenge is the large bandwidth mismatch between QD photons and the narrow optical transitions of the memories.<n>We find that a network with thousands of memories across several repeater nodes could achieve a secret-key rate of 500 bit/s over 1,000 km.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose and analyze a hybrid quantum repeater architecture that combines two leading hardware platforms: quantum dots (QDs) as bright, deterministic sources of entangled photon pairs and group-IV-vacancy centers in diamond as efficient, heralded quantum memories. This combination leverages high-rate entanglement generation together with long-lived storage, enabling scalable entanglement distribution over long distances. A key challenge is the large bandwidth mismatch between QD photons and the narrow optical transitions of the memories. We combine a comprehensive model of the spin-photon interface, including full spin-photon coupling dynamics, and explore mitigation strategies such as frequency filtering and optimized magnetic-field orientation. Our results show that with optimized designs, photon-to-memory transfer can be achieved with high efficiency and fidelity, supporting the feasibility of such hybrid systems. Finally, we analyze a full repeater chain using experimentally achievable parameters and find that a network with thousands of memories across several repeater nodes could achieve a secret-key rate of 500 bit/s over 1,000 km, demonstrating the strong potential of this approach for next-generation quantum networks.

Related papers

• Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks [49.82426139329382]
  We present a simple yet high-performance on-chip polarization-entangled photon-pair source on thin-film lithium niobate (TFLN)<n>Our device employs dual quasi-phase matching (D-QPM) that sequentially supports type-0 and type-I spontaneous parametric down-conversion in a single nanophotonic waveguide.<n>We realize wavelength-multiplexed entanglement distribution in a four-user quantum network deployed over metropolitan fiber links up to 50 km.
  arXiv  Detail & Related papers  (2025-11-27T18:30:01Z)
• Hybrid Single-Ion Atomic-Ensemble Node for High-Rate Remote Entanglement Generation [0.0]
  We develop a hybrid architecture for high-rate entanglement generation in quantum networks.<n>We show that our approach can lead to a significant speed-up for the fundamental task of creating ion-ion entanglement over hundreds of kilometers in a quantum network.
  arXiv  Detail & Related papers  (2025-11-06T16:07:59Z)
• A global quantum network with ground-based single-atom memories in optical cavities and satellite links [0.0]
  We propose a quantum repeater architecture for distributing entanglement over intercontinental distances.<n>The efficient entanglement swapping is achieved by performing high-fidelity Rydberg gates and readouts.<n>Our results show that this architecture enables entanglement distribution over intercontinental distances.
  arXiv  Detail & Related papers  (2025-07-03T05:58:03Z)
• A scalable cavity-based spin-photon interface in a photonic integrated circuit [0.15178488157371034]
  We show integration of nanophotonic cavities containing tin-vacancy (SnV) centers in a photonic integrated circuit (PIC) We find with near-term improvements this multiplexed architecture can enable high-fidelity quantum state transfer.
  arXiv  Detail & Related papers  (2024-02-28T05:26:32Z)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• High-rate sub-GHz linewidth bichromatic entanglement source for quantum networking [59.191830955730346]
  In this work, we study an entanglement source based on four-wave mixing in a diamond configuration in a warm rubidium vapor. We are able to achieve in-fiber entangled pair generation rates greater than $107, /s$, orders of magnitude higher than previously reported atomic sources.
  arXiv  Detail & Related papers  (2023-04-11T21:19:30Z)
• Purcell enhancement of single-photon emitters in silicon [68.8204255655161]
  Individual spins that are coupled to telecommunication photons offer unique promise for distributed quantum information processing. We implement such an interface by integrating erbium dopants into a nanophotonic silicon resonator. We observe optical Rabi oscillations and single-photon emission with a 78-fold Purcell enhancement.
  arXiv  Detail & Related papers  (2023-01-18T19:38:38Z)
• A Quantum Repeater Platform based on Single SiV$^-$ Centers in Diamond with Cavity-Assisted, All-Optical Spin Access and Fast Coherent Driving [45.82374977939355]
  Quantum key distribution enables secure communication based on the principles of quantum mechanics. Quantum repeaters are required to establish large-scale quantum networks. We present an efficient spin-photon interface for quantum repeaters.
  arXiv  Detail & Related papers  (2022-10-28T14:33:24Z)
• Fully on-chip photonic turnkey quantum source for entangled qubit/qudit state generation [0.0]
  Integrated photonics has recently become a leading platform for the realization and processing of optical entangled quantum states in chip formats. Here we demonstrate a fully integrated quantum light source, which overcomes these challenges through the combined integration of a laser cavity. The hybrid quantum source employs an electrically-pumped InP gain section and a Si$_3$N$_4$ low-loss microring filter system.
  arXiv  Detail & Related papers  (2022-06-17T12:14:21Z)
• Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register [48.7576911714538]
  Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. We propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register.
  arXiv  Detail & Related papers  (2021-04-26T14:41:01Z)
• Hybrid quantum photonics based on artificial atoms placed inside one hole of a photonic crystal cavity [47.187609203210705]
  Hybrid quantum photonics with SiV$-$-containing nanodiamonds inside one hole of a one-dimensional, free-standing, Si$_3$N$_4$-based photonic crystal cavity is presented. The resulting photon flux is increased by more than a factor of 14 as compared to free-space. Results mark an important step to realize quantum network nodes based on hybrid quantum photonics with SiV$-$- center in nanodiamonds.
  arXiv  Detail & Related papers  (2020-12-21T17:22:25Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.