# DTU: MoTe2 quantum emitters at 1090–1200 nm show g2(0) ~0.01 and Hong-Ou-Mandel visibility ~7.1%

- Published: 2026-11-13 07:59 UTC
- Section: Digital & Computing › Quantum technology
- Tags: MoTe2 quantum emitters, bilayer MoTe2, single-photon source, Hong-Ou-Mandel visibility, two-photon interference, transition-metal dichalcogenides, strain and defect engineering, near-infrared emitters, Technical University of Denmark
- URL: https://realtech.media/news/rt-66c68f10dcaf4d79c9575e25_dtu_mote2_quantum/

**Researchers at the Technical University of Denmark made near-infrared single-photon emitters in bilayer MoTe2; in the laboratory, post-selected two-photon interference visibility reached ~60%.**

![DTU: MoTe2 quantum emitters at 1090–1200 nm show g2(0) ~0.01 and Hong-Ou-Mandel visibility ~7.1%](https://realtech.media/media/2026/11/4794567e808dca58.jpg)
*Alessiocoser, Wikimedia Commons, CC BY 4.0*

A group at the Department of Electrical and Photonics Engineering, Technical University of Denmark (Lyngby), reported near-infrared quantum emitters in bilayer MoTe2. The paper appeared in Nature Communications on 11 November 2026. [1] The emitters operate between 1090 and 1200 nm and were produced by deterministic strain and defect engineering, which the authors describe as a reproducible approach. [1]

## Single-photon sources and the MoTe2 platform

According to the authors, single-photon sources operating at telecom wavelengths are fundamental components for long-distance optical quantum communication and information processing. Two-dimensional transition-metal dichalcogenides are a promising platform for such sources. Their development, however, has been hindered by limited spectral range and poor single-photon indistinguishability. [1]

The work addresses both limitations in a laboratory setting. The emitters in bilayer MoTe2 cover the range of 1090–1200 nm, and their indistinguishability was measured directly by two-photon interference. [1]

## Emitter characteristics and interference results

The emitters show strong linear polarization, sub-nanosecond lifetimes and resolution-limited emission. Single-photon purity is high: the triggered g(2)(0) was as low as ~0.01 under p-shell excitation. [1]

Electrostatic biasing tunes the emission spectrum, suppresses photon bunching and shortens radiative lifetimes. [1]

Two-photon interference measurements gave a Hong-Ou-Mandel visibility of ~7.1%. With post-selection under p-shell excitation, the visibility reached up to ~60%. According to the authors, this is state-of-the-art performance for quantum emitters in the transition-metal dichalcogenide platform. [1]

The authors conclude that the results establish MoTe2 as a viable platform for tunable, low-noise, high-purity single-photon sources for quantum photonics. The paper is titled "Toward triggered generation of indistinguishable single photons from MoTe2 quantum emitters". Its authors are Paweł Wyborski, Athanasios Paralikis, Pietro Metuh, Martin A. Jacobsen, Christian C. Ruiz Madera, Niels Gregersen and Battulga Munkhbat. [1]

## Sources

1. [Nature Communications](https://doi.org/10.1038/s41467-026-78808-y)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-66c68f10dcaf4d79c9575e25_dtu_mote2_quantum/