2D materials advance quantum photonics
Integrated WSe₂ emitters and WS₂ waveguides demonstrate high-purity single-photon emission for quantum photonic circuits.
Researchers at the Technical University of Denmark have demonstrated an integrated quantum light source combining strain-engineered bilayer tungsten diselenide (WSe₂) emitters with tungsten disulfide (WS₂) waveguides.
The device achieved a second-order correlation value, g²(0), of 0.003, indicating high single-photon purity.
The measured out-coupled photon rate was approximately 357 kHz, corresponding to an estimated on-chip generation rate of at least 1.68 MHz.
The platform uses two-dimensional transition metal dichalcogenide materials, with a hexagonal boron nitride (hBN) spacer helping to reduce WSe₂ fracturing during transfer.
The researchers also used discrete-state excitation to suppress background emission and improve measurement clarity.
By integrating photon emitters with waveguides in a van der Waals material platform, the approach could support future quantum photonic circuits.
The researchers envisage integrating additional components, including single-photon detectors, to develop more complete on-chip quantum systems.
