A ultrabright, two-colour photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths

• URL: http://arxiv.org/abs/2506.18609v1
• Date: Mon, 23 Jun 2025 13:12:45 GMT
• Title: A ultrabright, two-colour photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths
• Authors: Silia Babel, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla, Ronja Köthemann, Bernhard Reineke, Harald Herrmann, Benjamin Brecht, Christof Eigner, Laura Padberg, Christine Silberhorn,
• Abstract summary: We present a guided-wave, bright and highly frequency non-degenerate parametric down-conversion source in thin-film lithium niobate.<n>The source generates photon pairs with wavelengths of 815$,mathrmnm$ and 1550$,mathrmnm$ linking the visible wavelength regime with telecommunication wavelengths.<n>Our results set a new standard for on-chip, non-degenerate photon-pair sources and represent a crucial step towards practical, scalable quantum communication networks and photonic quantum computing.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present the design and characterisation of a guided-wave, bright and highly frequency non-degenerate parametric down-conversion source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815$\,\mathrm{nm}$ and 1550$\,\mathrm{nm}$ linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as $g^{(2)}_h(0) = (6.7\pm1.1)\cdot10^{-3}$. Furthermore, we achieve a high spectral brightness of 0.44$\cdot$10$^{7}$$\frac{\text{pairs}}{\text{s} \cdot \text{mW} \cdot \text{GHz}}$ which is two orders of magnitude higher than sources based on weakly guiding waveguides. The almost perfect sinc-shape and the strong agreement between the effective and nominal bandwidth highlights the success of our integrated workflow, which begins with device design and continues through precise fabrication to detailed quantum-state characterization. This comprehensive approach enables targeted optimization of the source, resulting in excellent quantum state generation. Our results set a new standard for on-chip, non-degenerate photon-pair sources and represent a crucial step towards practical, scalable quantum communication networks and photonic quantum computing.

Related papers

• On-demand generation of entangled photons pairs in the telecom O-band from nanowire quantum dots [0.0]
  On-demand entangled photon pairs at telecom wavelengths are crucial for quantum communication.<n>We demonstrate an on-demand bright source of entangled photon pairs with high fidelity in the telecom O-band based on site-controlled nanowire quantum dots.
  arXiv  Detail & Related papers  (2025-02-19T19:53:24Z)
• Integrated, bright, broadband parametric down-conversion source for quantum metrology and spectroscopy [0.0]
  In this work we demonstrate an integrated two-colour SPDC source utilising a group-velocity matched lithium niobate waveguide. By converting a narrow band pump to broadband pulses the created photon pairs show correlation times of $Delta tau approx 120,textfs$ while maintaining the narrow bandwidth $Delta omega_p ll 1,textMHz$ of the CW pump light, yielding strong time-frequency entanglement.
  arXiv  Detail & Related papers  (2024-02-27T13:57:16Z)
• All-optical modulation with single-photons using electron avalanche [66.27103948750306]
  We demonstrate all-optical modulation enabled by electron avalanche process in silicon.<n>Our approach opens the possibility of gigahertz-speed, and potentially even faster, optical switching at the single-photon level.
  arXiv  Detail & Related papers  (2023-12-18T20:14:15Z)
• 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)
• Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power [51.961447341691]
  Nonclassical photon sources of high brightness are key components of quantum communication technologies. We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber.
  arXiv  Detail & Related papers  (2022-08-10T09:04:15Z)
• Quantum-limited millimeter wave to optical transduction [50.663540427505616]
  Long distance transmission of quantum information is a central ingredient of distributed quantum information processors. Current approaches to transduction employ solid state links between electrical and optical domains. We demonstrate quantum-limited transduction of millimeter-wave (mmwave) photons into optical photons using cold $85$Rb atoms as the transducer.
  arXiv  Detail & Related papers  (2022-07-20T18:04:26Z)
• Spectrally multiplexed and ultrabright entangled photon pairs in a lithium niobate microresonator [0.2419996885033735]
  We demonstrate an ultrabright and broadband biphoton quantum source generated in a lithium niobate microresonator system. Such sources at the telecommunication band pave the way for high-dimensional entanglement and future integrated quantum information systems.
  arXiv  Detail & Related papers  (2021-10-18T03:30:18Z)
• Optimised Domain-engineered Crystals for Pure Telecom Photon Sources [101.18253437732933]
  We present a telecom-wavelength parametric down-conversion photon source that operates on the achievable limit of domain engineering. We generate photons from independent sources which achieve two-photon interference visibilities of up to $98.6pm1.1%$ without narrow-band filtering.
  arXiv  Detail & Related papers  (2021-01-20T19:00:04Z)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)

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.