Absorption-emission quantum repeater using diamond quantum memories

• URL: http://arxiv.org/abs/2608.17470v1
• Date: Tue, 18 Aug 2026 07:56:00 GMT
• Title: Absorption-emission quantum repeater using diamond quantum memories
• Abstract summary: Quantum repeaters are essential for overcoming the exponential photon loss that limits entanglement generation over long distances in quantum networks.<n>An absorption-emission-based quantum repeater exploits the fundamental light-matter interactions of a diamond nitrogen-vacancy center to transfer a quantum state from an absorbed photon to an emitted photon, offering a scalable architecture that operates without photon interference between remote nodes.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum repeaters are essential for overcoming the exponential photon loss that limits entanglement generation over long distances in quantum networks. An absorption-emission-based quantum repeater exploits the fundamental light-matter interactions of a diamond nitrogen-vacancy (NV) center---photon absorption and photon emission---to transfer a quantum state from an absorbed photon to an emitted photon, offering a scalable architecture that operates without photon interference between remote nodes. Here we demonstrate an absorption-emission-based quantum repeater node using a single NV center, realizing the complete single-node operation in which heralded photon-to-memory quantum state transfer, repeat-until-success (RUS) emission of a spin-entangled photon, and quantum teleportation of the memory state onto the emitted photon constitute the essential repeater operation. By characterizing the complete repeater operation as a quantum channel from the absorbed photon to the emitted photon via quantum process tomography, we obtain a process fidelity of 78%. This demonstration establishes the absorption-emission approach as a fundamental building block for scalable quantum repeater architectures and paves the way toward practical long-distance quantum networks.

Related papers

• Highly indistinguishable photons from a tin-vacancy spin qubit in diamond [0.0]
  Quantum networks promise secure communication, distributed sensing and modular quantum computing.<n>A key requirement is the indistinguishability of single photons, which directly impacts the fidelity of photonic operations.<n>Here, we demonstrate generation of highly indistinguishable single photons from a coherently excited tin-vacancy center in diamond.
  arXiv  Detail & Related papers  (2026-07-24T16:00:50Z)
• Quantum memristor with vacuum--one-photon qubits [0.0]
  An optical quantum memristor can be realized with a vacuum--one-photon qubit entering a tunable beam splitter.<n>We show that the coherence of the input state is preserved by the quantum memristor.
  arXiv  Detail & Related papers  (2025-03-04T10:22:03Z)
• Cavity-Quantum Electrodynamics with Moiré Flatband Photonic Crystals [35.119260614523256]
  A quantum dot can be tuned by a factor of 40, ranging from 42 ps to 1692 ps, which is attributed to strong Purcell enhancement and Purcell inhibition effects.<n>Our findings pave the way for moir'e flatband cavity-enhanced quantum light sources, quantum optical switches, and quantum nodes for quantum internet applications.
  arXiv  Detail & Related papers  (2024-11-25T18:52:11Z)
• Non-classical excitation of a solid-state quantum emitter [0.0]
  We show that a single photon is sufficient to change the state of a solid-state quantum emitter. These results suggest future possibilities ranging from enabling quantum information transfer in a quantum network to building deterministic entangling gates for photonic quantum computing.
  arXiv  Detail & Related papers  (2024-07-30T16:16:58Z)
• Optical single-shot readout of spin qubits in silicon [41.94295877935867]
  silicon nanofabrication offers unique advantages for integration and up-scaling. Small spin-qubit registers have exceeded error-correction thresholds, their connection to large quantum computers is an outstanding challenge. We implement such an efficient spin-photon interface based on erbium dopants in a nanophotonic resonator.
  arXiv  Detail & Related papers  (2024-05-08T18:30:21Z)
• Tunable photon-mediated interactions between spin-1 systems [68.8204255655161]
  We show how to harness multi-level emitters with several optical transitions to engineer photon-mediated interactions between effective spin-1 systems. Our results expand the quantum simulation toolbox available in cavity QED and quantum nanophotonic setups.
  arXiv  Detail & Related papers  (2022-06-03T14:52:34Z)
• On-chip spin-photon entanglement based on single-photon scattering [2.4567119332161234]
  We demonstrate an on-chip entangling gate between an incoming photon and a stationary quantum-dot spin qubit. Results represent a major step in realizing a quantum node capable of both photonic entanglement generation and on-chip quantum logic.
  arXiv  Detail & Related papers  (2022-05-25T15:14:28Z)
• An integrated whispering-gallery-mode resonator for solid-state coherent quantum photonics [6.082529164787429]
  We report on an integrated microdisk cavity containing self-assembled quantum dots to coherently route photons. We show how this integrated system can coherently re-route photons between the drop and bus ports. We discuss the strengths and limitations of this approach, focusing on how it can be used to increase the efficiency of quantum devices.
  arXiv  Detail & Related papers  (2021-07-26T12:51:39Z)
• Single photon emission from individual nanophotonic-integrated colloidal quantum dots [45.82374977939355]
  Solution processible colloidal quantum dots hold great promise for realizing single-photon sources embedded into scalable quantum technology platforms. We report on integrating individual colloidal core-shell quantum dots into a nanophotonic network that allows for excitation and efficient collection of single-photons via separate waveguide channels.
  arXiv  Detail & Related papers  (2021-04-23T22:14:17Z)
• 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)
• Optical repumping of resonantly excited quantum emitters in hexagonal boron nitride [52.77024349608834]
  We present an optical co-excitation scheme which uses a weak non-resonant laser to reduce transitions to a dark state and amplify the photoluminescence from quantum emitters in hexagonal boron nitride (hBN) Our results are important for the deployment of atom-like defects in hBN as reliable building blocks for quantum photonic applications.
  arXiv  Detail & Related papers  (2020-09-11T10:15:22Z)
• Generating Spatially Entangled Itinerant Photons with Waveguide Quantum Electrodynamics [43.53795072498062]
  In this work, we demonstrate the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. We generate two-photon N00N states and show that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies.
  arXiv  Detail & Related papers  (2020-03-16T16:03:27Z)

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.