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arXiv · 2508.20743

Toward triggered generation of indistinguishable single-photons from MoTe$_2$ quantum emitters

Paweł Wyborski·Athanasios Paralikis·Pietro Metuh·Martin A. Jacobsen·Christian Ruiz·Niels Gregersen·Battulga Munkhbat
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Abstract

Single-photon sources operating in the telecom band are fundamental components for long-distance optical quantum communication and information processing. Two-dimensional (2D) transition metal dichalcogenides (TMDs) offer a promising platform for such sources, but their development has been hindered by limited spectral range and poor single-photon indistinguishability. Here, we demonstrate a reproducible and systematic approach for generating near-infrared (1090-1200 nm) quantum emitters in bilayer MoTe$_2$ using deterministic strain and defect engineering. These emitters exhibit strong linear polarization (DOLP $>70\%$), sub-nanosecond lifetimes ($\tau \leqslant$ ~450 ps), high single-photon purity ($g^{(2)}(0)<0.1$), and resolution-limited emission ($\sim$200 $\mu$eV). Electrostatic biasing enables Stark tuning over a $\sim$3 meV range, reduced photon bunching, and significantly shortened radiative lifetimes, yielding narrow emission with ratios of experimental to transform-limited linewidths as low as $R\sim55$. Most notably, two-photon interference measurements reveal a Hong-Ou-Mandel visibility of $V_\text{HOM}\sim $10$\%$, and up to $V_\text{HOM}\sim$ 40$\%$ with post-selection by temporal filtering, representing the highest reported indistinguishability for any TMD quantum emitters and the first such demonstration in the near-infrared regime. These results establish MoTe$_2$ as a viable platform for tunable, low-noise, high-purity single-photon sources with promising indistinguishability, paving the way for their integration into telecom-compatible quantum photonic technologies.

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Paweł Wyborski, Athanasios Paralikis, Pietro Metuh, Martin A. Jacobsen, Christian Ruiz, Niels Gregersen, Battulga Munkhbat. 2025-08-28. Toward triggered generation of indistinguishable single-photons from MoTe$_2$ quantum emitters. https://arxiv.org/abs/2508.20743

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