Monolayer-Based Single-Photon Source in a Liquid-Helium-Free Open Cavity Featuring 65% Brightness and Quantum Coherence

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Abstract
Solid-state single-photon sources are central building blocks in quantum information processing. Atomically thin crystals have emerged as sources of nonclassical light; however, they perform below the state-of-the-art devices based on volume crystals. Here, we implement a bright single-photon source based on an atomically thin sheet of WSe2 coupled to a tunable optical cavity in a liquid-helium-free cryostat without the further need for active stabilization. Its performance is characterized by high single-photon purity (g(2)(0) = 4.7 ± 0.7%) and record-high, first-lens brightness of linearly polarized photons of 65 ± 4%, representing a decisive step toward real-world quantum applications. The high performance of our devices allows us to observe two-photon interference in a Hong-Ou-Mandel experiment with 2% visibility limited by the emitter coherence time and setup resolution. Our results thus demonstrate that the combination of the unique properties of two-dimensional materials and versatile open cavities emerges as an inspiring avenue for novel quantum optoelectronic devices.
Funding Information
  • Carl von Ossietzky Universit??t Oldenburg
  • Bundesministerium f??r Bildung und Forschung
  • Nieders??chsisches Ministerium f??r Wissenschaft und Kultur (DyNano)
  • Comunidad de Madrid (2020T1/IND19785)
  • Fundaci??n Ram??n Areces (ULTRA-BRIGHT)
  • Ministerio de Ciencia e Innovaci??n (PID2020-113445GB-I00)
  • Deutsche Forschungsgemeinschaft (INST 184/220-1 FUGG, SCHN1376 11.1, SCHN1376 14.1)
  • U.S. Department of Energy (DOE-SC0020653)
  • European Commission (101017733, 679288)
  • National Science Foundation (DMR 2111812, DMR 2206987, ECCS 2052527, ECCS 2111812, GOALI 2129412)
  • Volkswagen Foundation (SMART)

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