ArXiv · 2025
Single-photon sources operating at telecom wavelengths 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 MoTe₂ using deterministic strain and defect engineering. These emitters exhibit strong linear polarization (DOLP >70%), sub-nanosecond lifetimes (τ ∼ 130-450 ps), high single-photon purity with triggered g⁽²⁾(0) values as low as ∼0.01 (∼0.16) under p-shell (quasi-resonant) excitation, and resolution-limited emission (∼150 μeV). Electrostatic biasing enables tuning over a ∼3 meV range, suppresses photon bunching, and significantly shortens radiative lifetimes, yielding narrow emission with ratios of experimental to transform-limited linewidths as low as R∼55. Most notably, two-photon interference measurements reveal a Hong-Ou-Mandel visibility of V_HOM∼ 7.1% (3.6%), and up to V_HOM∼ 60% (∼40%) with post-selection by temporal filtering under p-shell (quasi-resonant) excitation. To our knowledge, this presents the highest reported indistinguishability for TMD quantum emitters and the first such demonstration for MoTe₂ platform. These results establish MoTe₂ as a viable platform for tunable, low-noise, high-purity single-photon sources with state-of-the-art indistinguishability for TMD quantum emitters, paving the way for their integration into telecom-compatible quantum photonic technologies.
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