{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T17:15:37Z","timestamp":1788455737229,"version":"build-2803163510"},"reference-count":43,"publisher":"American Chemical Society (ACS)","issue":"34","license":[{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-029"},{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-037"},{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-045"}],"funder":[{"DOI":"10.13039\/501100001665","name":"Agence Nationale de la Recherche","doi-asserted-by":"publisher","award":["ANR-17-EURE-0009"],"award-info":[{"award-number":["ANR-17-EURE-0009"]}],"id":[{"id":"10.13039\/501100001665","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001665","name":"Agence Nationale de la Recherche","doi-asserted-by":"publisher","award":["ANR-21-ESRE-0025"],"award-info":[{"award-number":["ANR-21-ESRE-0025"]}],"id":[{"id":"10.13039\/501100001665","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12074033"],"award-info":[{"award-number":["12074033"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12321004"],"award-info":[{"award-number":["12321004"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002830","name":"Centre National d?Etudes Spatiales","doi-asserted-by":"publisher","award":["NA"],"award-info":[{"award-number":["NA"]}],"id":[{"id":"10.13039\/501100002830","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/na","name":"National Key R&D Program of China","doi-asserted-by":"publisher","award":["2024YFA1408700"],"award-info":[{"award-number":["2024YFA1408700"]}],"id":[{"id":"10.13039\/na","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/na","name":"Beijing-Tianjin-Hebei Collaborative Innovation Project","doi-asserted-by":"publisher","award":["24YFXTHZ00140"],"award-info":[{"award-number":["24YFXTHZ00140"]}],"id":[{"id":"10.13039\/na","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/na","name":"Beijing Natural Science Foundation","doi-asserted-by":"publisher","award":["Z210006"],"award-info":[{"award-number":["Z210006"]}],"id":[{"id":"10.13039\/na","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Nanoscale quantum light sources are essential building blocks for integrated quantum photonic systems. Here, we report a wavelength-scale entangled-photon source based on van der Waals-engineered NbOBr2 and benchmark its performance for telecom-wavelength quantum light generation. By exploiting the material\u2019s second-order nonlinearity, we generate quantum-correlated photon pairs via spontaneous parametric down-conversion. We then use a 90\u00b0 twisted stacking to induce quantum interference in photon-pair generation, yielding polarization-entangled photons. This approach enables tunability of the quantum optical state via control of the excitation laser polarization. We experimentally obtain entanglement fidelities exceeding 95% for Bell states, along with a high coincidence-to-accidental ratio of \u223c335 and a brightness approximately 1 order of magnitude higher than recently reported telecom sources based on transition metal dichalcogenide two-dimensional materials. These results establish twisted van der Waals engineering as a powerful platform for highly tunable, high-brightness quantum light sources at telecom wavelengths.<\/jats:p>","DOI":"10.1021\/acs.nanolett.6c02461","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T20:02:04Z","timestamp":1787083324000},"page":"11370-11377","source":"Crossref","is-referenced-by-count":0,"title":["Entangled Telecom\nPhotons Generation Using Twisted\nvan der Waals Crystals"],"prefix":"10.1021","volume":"26","author":[{"given":"Nidhin","family":"Prasannan","sequence":"first","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Konstantinos","family":"Mourzidis","sequence":"additional","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vishwas","family":"Jindal","sequence":"additional","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanting","family":"Li","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Di","family":"Lin","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenchen","family":"Yang","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deng","family":"Hu","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liu","family":"Yang","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Balocchi","sequence":"additional","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Delphine","family":"Lagarde","sequence":"additional","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierre","family":"Renucci","sequence":"additional","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiwei","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]},{"name":"Beijing Institute of Technology , ,","place":["Zhuhai, China, 519000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gang","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing Institute of Technology , , ,","place":["Beijing, China, 100081"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7772-2517","authenticated-orcid":true,"given":"Xavier","family":"Marie","sequence":"additional","affiliation":[{"name":"Universite\u0301 de Toulouse, INSA, CNRS, LPCNO , 135 Avenue de Rangueil , ,","place":["Toulouse, France, 31077"]},{"name":"Institut Universitaire de France , ,","place":["Paris, France, 75231"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"2026090311564506200_cit1","doi-asserted-by":"publisher","first-page":"1301","DOI":"10.1103\/RevModPhys.81.1301","article-title":"The Security of Practical Quantum\nKey Distribution","volume":"81","author":"Scarani","year":"2009","journal-title":"Rev. Mod. Phys."},{"key":"2026090311564506200_cit2","doi-asserted-by":"publisher","first-page":"194","DOI":"10.1038\/s42254-021-00398-z","article-title":"The potential and global\noutlook of integrated photonics for quantum technologies","volume":"4","author":"Pelucchi","year":"2022","journal-title":"Nat. Rev. Phys."},{"key":"2026090311564506200_cit3","doi-asserted-by":"publisher","first-page":"291","DOI":"10.1080\/00107514.2018.1488463","article-title":"Spontaneous\nparametric down-conversion","volume":"59","author":"Couteau","year":"2018","journal-title":"Contemp. Phys."},{"key":"2026090311564506200_cit4","doi-asserted-by":"publisher","DOI":"10.1063\/5.0023103","article-title":"Entangled photon-pair\nsources based on three-wave mixing in bulk\ncrystals","volume":"92","author":"Anwar","year":"2021","journal-title":"Rev. Sci. Instrum."},{"key":"2026090311564506200_cit5","doi-asserted-by":"publisher","first-page":"4337","DOI":"10.1103\/PhysRevLett.75.4337","article-title":"New High-Intensity\nSource of Polarization-Entangled\nPhoton Pairs","volume":"75","author":"Kwiat","year":"1995","journal-title":"Phys. Rev. Lett."},{"key":"2026090311564506200_cit6","doi-asserted-by":"publisher","first-page":"32475","DOI":"10.1364\/OE.26.032475","article-title":"High-performance source of spectrally\npure, polarization entangled photon pairs based on hybrid integrated-bulk\noptics","volume":"26","author":"Meyer-Scott","year":"2018","journal-title":"Opt. Express"},{"key":"2026090311564506200_cit7","doi-asserted-by":"publisher","DOI":"10.1002\/qute.202500551","article-title":"Advancements\nin Entangled Photon Pairs in 2D Van der Waal Materials for On-Chip\nQuantum Device Applications","volume":"9","author":"Sarkar","year":"2026","journal-title":"Adv. Quantum Technol."},{"key":"2026090311564506200_cit8","doi-asserted-by":"publisher","first-page":"43","DOI":"10.1038\/nature26160","article-title":"Unconventional superconductivity\nin magic-angle graphene superlattices","volume":"556","author":"Cao","year":"2018","journal-title":"Nature"},{"key":"2026090311564506200_cit9","doi-asserted-by":"publisher","first-page":"5944","DOI":"10.1021\/acsnano.0c10435","article-title":"Moire\u0301 Patterns\nin 2D Materials:\nA Review","volume":"15","author":"He","year":"2021","journal-title":"ACS Nano"},{"key":"2026090311564506200_cit10","doi-asserted-by":"publisher","first-page":"6935","DOI":"10.1021\/acs.nanolett.0c03175","article-title":"The Rise of Twist-Optics","volume":"20","author":"Herzig Sheinfux","year":"2020","journal-title":"Nano Lett."},{"key":"2026090311564506200_cit11","doi-asserted-by":"publisher","DOI":"10.1126\/science.adg0014","article-title":"Moire\u0301 photonics and optoelectronics","volume":"379","author":"Du","year":"2023","journal-title":"Science"},{"key":"2026090311564506200_cit12","doi-asserted-by":"publisher","first-page":"7600","DOI":"10.1038\/s41467-024-51843-3","article-title":"A tunable\ntransition metal dichalcogenide entangled photon-pair source","volume":"15","author":"Weissflog","year":"2024","journal-title":"Nat. Commun."},{"key":"2026090311564506200_cit13","doi-asserted-by":"publisher","first-page":"16","DOI":"10.1186\/s43593-024-00074-6","article-title":"Polarization-entangled\nphoton-pair source with van der Waals 3R-WS2 crystal","volume":"4","author":"Feng","year":"2024","journal-title":"eLight"},{"key":"2026090311564506200_cit14","doi-asserted-by":"publisher","first-page":"9616","DOI":"10.1038\/s41467-025-64620-7","article-title":"Counter-propagating\nentangled photon pairs from monolayer GaSe","volume":"16","author":"Lu","year":"2025","journal-title":"Nat. Commun."},{"key":"2026090311564506200_cit15","doi-asserted-by":"publisher","first-page":"1899","DOI":"10.1038\/s41467-025-56436-2","article-title":"A tunable\nentangled photon-pair source based on a Van der Waals insulator","volume":"16","author":"Lyu","year":"2025","journal-title":"Nat. Commun."},{"key":"2026090311564506200_cit16","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adt3710","article-title":"Tunable polarization entangled photon-pair\nsource in rhombohedral boron nitride","volume":"11","author":"Liang","year":"2025","journal-title":"Sci. Adv."},{"key":"2026090311564506200_cit17","doi-asserted-by":"publisher","first-page":"653","DOI":"10.1364\/OL.411176","article-title":"Entangled photons from subwavelength\nnonlinear films","volume":"46","author":"Santiago-Cruz","year":"2021","journal-title":"Opt. Lett."},{"key":"2026090311564506200_cit18","doi-asserted-by":"publisher","first-page":"53","DOI":"10.1038\/s41586-022-05393-7","article-title":"Ultrathin quantum light\nsource with van der Waals NbOCl2 crystal","volume":"613","author":"Guo","year":"2023","journal-title":"Nature"},{"key":"2026090311564506200_cit19","doi-asserted-by":"publisher","first-page":"142","DOI":"10.1038\/s41566-024-01545-5","article-title":"Van der Waals engineering\nfor quantum-entangled photon generation","volume":"19","author":"Kallioniemi","year":"2025","journal-title":"Nat.\nPhotonics"},{"key":"2026090311564506200_cit20","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-024-54876-w","article-title":"Polarization entanglement\nenabled by orthogonally stacked van der Waals NbOCl2 crystals","volume":"15","author":"Guo","year":"2024","journal-title":"Nat. Commun."},{"key":"2026090311564506200_cit21","doi-asserted-by":"publisher","first-page":"arXiv:2603.04082","DOI":"10.48550\/arXiv.2603.04082","article-title":"Air-stable\nbright entangled photon-pair source from graphene-encapsulated van\nder Waals ferroelectric NbOI2","author":"Joshi","year":"2026","journal-title":"arXiv"},{"key":"2026090311564506200_cit22","doi-asserted-by":"publisher","first-page":"8148","DOI":"10.1038\/s41467-026-75018-4","article-title":"Nonlinear Quantum Light\nSource with van der Waals Ferroelectric\nNbOX2 (X = Br, I)","volume":"17","author":"Wang","year":"2026","journal-title":"Nat. Commun."},{"key":"2026090311564506200_cit23","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.132.246902","article-title":"Exciton-Enhanced Spontaneous Parametric\nDown-Conversion in Two-Dimensional Crystals","volume":"132","author":"Xuan","year":"2024","journal-title":"Phys. Rev. Lett."},{"key":"2026090311564506200_cit24","doi-asserted-by":"publisher","first-page":"5911","DOI":"10.1038\/s41467-023-41383-7","article-title":"Manipulation of nonlinear\noptical responses in layered ferroelectric niobium oxide dihalides","volume":"14","author":"Ye","year":"2023","journal-title":"Nat. Commun."},{"key":"2026090311564506200_cit25","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202400858","article-title":"Extraordinary Enhancement of Nonlinear Optical\nInteraction in NbOBr2 Microcavities","volume":"36","author":"Chen","year":"2024","journal-title":"Adv. Mater."},{"key":"2026090311564506200_cit26","doi-asserted-by":"publisher","DOI":"10.1103\/y4tn-jxn8","article-title":"Enhanced second harmonic generation in NbOBr2 through reverse stacking","volume":"111","author":"Tang","year":"2025","journal-title":"Phys. Rev.\nB"},{"key":"2026090311564506200_cit27","doi-asserted-by":"publisher","first-page":"11844","DOI":"10.1021\/acs.nanolett.5c02170","article-title":"Enhanced Photon-Pair\nGeneration from a van der Waals Metasurface","volume":"25","author":"Fan","year":"2025","journal-title":"Nano Lett."},{"key":"2026090311564506200_cit28","doi-asserted-by":"publisher","DOI":"10.1016\/C2015-0-05510-1","volume-title":"Nonlinear Optics","author":"Boyd","year":"2020","edition":"4"},{"key":"2026090311564506200_cit29","doi-asserted-by":"publisher","first-page":"84","DOI":"10.1103\/PhysRevLett.25.84","article-title":"Observation of Simultaneity\nin Parametric Production\nof Optical Photon Pairs","volume":"25","author":"Burnham","year":"1970","journal-title":"Phys. Rev. Lett."},{"key":"2026090311564506200_cit30","doi-asserted-by":"publisher","first-page":"3329","DOI":"10.1021\/nl401561r","article-title":"Probing Symmetry\nProperties of Few-Layer MoS2 and h-BN by Optical Second-Harmonic\nGeneration","volume":"13","author":"Li","year":"2013","journal-title":"Nano Lett."},{"key":"2026090311564506200_cit31","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.114.097403","article-title":"Giant Enhancement\nof the Optical Second-Harmonic Emission of WSe2 Monolayers\nby Laser Excitation at Exciton Resonances","volume":"114","author":"Wang","year":"2015","journal-title":"Phys.\nRev. Lett."},{"key":"2026090311564506200_cit32","doi-asserted-by":"publisher","DOI":"10.1063\/5.0286042","article-title":"Electronic, structural,\nmechanical, and piezoelectric properties of bulk NbOX2 (X\n= Cl, Br, I): A DFT study","volume":"15","author":"Tamang","year":"2025","journal-title":"AIP Adv."},{"key":"2026090311564506200_cit33","doi-asserted-by":"publisher","first-page":"27","DOI":"10.1038\/177027a0","article-title":"Correlation between Photons in two\nCoherent Beams of Light","volume":"177","author":"Hanbury Brown","year":"1956","journal-title":"Nature"},{"key":"2026090311564506200_cit34","doi-asserted-by":"publisher","first-page":"36644","DOI":"10.1364\/OE.441488","article-title":"Measurement of the biphoton second-order\ncorrelation function with analog detectors","volume":"29","author":"Safronenkov","year":"2021","journal-title":"Opt. Express"},{"key":"2026090311564506200_cit35","doi-asserted-by":"publisher","first-page":"951","DOI":"10.1070\/QE2006v036n10ABEH013300","article-title":"Multiphoton\ncorrelations in parametric down-conversion and their\nmeasurement in the pulsed regime","volume":"36","author":"Ivanova","year":"2006","journal-title":"Quantum Electron."},{"key":"2026090311564506200_cit36","doi-asserted-by":"publisher","first-page":"273","DOI":"10.1007\/s100530050036","article-title":"On the measurement\nof photon flux\nin parametric down-conversion","volume":"8","author":"Brida","year":"2000","journal-title":"Eur. Phys. J.\nD"},{"key":"2026090311564506200_cit37","doi-asserted-by":"publisher","first-page":"R773","DOI":"10.1103\/PhysRevA.60.R773","article-title":"Ultrabright source of polarization-entangled\nphotons","volume":"60","author":"Kwiat","year":"1999","journal-title":"Phys. Rev. A"},{"key":"2026090311564506200_cit38","doi-asserted-by":"publisher","first-page":"1070","DOI":"10.1103\/PhysRev.108.1070","article-title":"Discussion of Experimental Proof\nfor the Paradox of\nEinstein, Rosen, and Podolsky","volume":"108","author":"Bohm","year":"1957","journal-title":"Phys. Rev."},{"key":"2026090311564506200_cit39","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevA.64.052312","article-title":"Measurement of qubits","volume":"64","author":"James","year":"2001","journal-title":"Phys.\nRev. A"},{"key":"2026090311564506200_cit40","doi-asserted-by":"publisher","DOI":"10.1063\/5.0069992","article-title":"Visible-Wavelength Polarization-Entangled Photon Source\nfor Quantum Communication and Imaging","volume":"120","author":"Sansa Perna","year":"2022","journal-title":"Appl.\nPhys. Lett."},{"key":"2026090311564506200_cit41","doi-asserted-by":"publisher","first-page":"1140","DOI":"10.1126\/science.aan3211","article-title":"Satellite-Based Entanglement\nDistribution over 1200 Kilometers","volume":"356","author":"Yin","year":"2017","journal-title":"Science"},{"key":"2026090311564506200_cit42","doi-asserted-by":"publisher","first-page":"9229","DOI":"10.1021\/acs.nanolett.5c00952","article-title":"Nonlinear van der Waals\nMetasurfaces with Resonantly Enhanced Light Generation","volume":"25","author":"Ling","year":"2025","journal-title":"Nano Lett."},{"key":"2026090311564506200_cit43","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.115.250402","article-title":"Strong Loophole-Free\nTest of Local Realism","volume":"115","author":"Shalm","year":"2015","journal-title":"Phys. Rev. Lett."}],"container-title":["Nano Letters"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/acs.nanolett.6c02461","content-type":"application\/pdf","content-version":"vor","intended-application":"unspecified"},{"URL":"https:\/\/pubs.acs.org\/nalefd\/article-pdf\/26\/34\/11370\/66854667\/acs.nanolett.6c02461.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.acs.org\/nalefd\/article-pdf\/26\/34\/11370\/66854667\/acs.nanolett.6c02461.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T16:22:24Z","timestamp":1788452544000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/nalefd\/article\/26\/34\/11370\/5275759\/Entangled-Telecom-Photons-Generation-Using-Twisted"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,18]]},"references-count":43,"journal-issue":{"issue":"34","published-online":{"date-parts":[[2026,8,18]]},"published-print":{"date-parts":[[2026,9,2]]}},"URL":"https:\/\/doi.org\/10.1021\/acs.nanolett.6c02461","relation":{},"ISSN":["1530-6984","1530-6992"],"issn-type":[{"value":"1530-6984","type":"print"},{"value":"1530-6992","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,18]]}}}