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

Journal Article · · Nano Letters
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [1]; ORCiD logo [1];  [1];  [3];  [3];  [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [1]; ORCiD logo [7];  [8]; ORCiD logo [1];  [1]
  1. Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
  2. Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany, University of Applied Sciences Emden/Leer, 26723 Emden, Germany
  3. Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07743 Jena, Germany, Fraunhofer-Institute for Applied Optics and Precision Engineering IOF, 07743 Jena, Germany, Max-Planck-School of Photonics, 07743 Jena, Germany
  4. Materials Science and Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287, United States
  5. Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  6. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  7. University of Applied Sciences Emden/Leer, 26723 Emden, Germany
  8. Depto. de Física de Materiales, Instituto Nicolás Cabrera, Instituto de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain

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.

Research Organization:
Carl von Ossietzky University Oldenburg (Germany)
Sponsoring Organization:
USDOE
Grant/Contract Number:
DOE-SC0020653; SC0020653
OSTI ID:
1999304
Alternate ID(s):
OSTI ID: 2006575
Journal Information:
Nano Letters, Journal Name: Nano Letters Vol. 23 Journal Issue: 18; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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