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

Area of Science:

• Quantum Information Science
• Materials Science
• Optoelectronics

Background:

• Solid-state single-photon sources are crucial for quantum information processing.
• Atomically thin crystals show promise but lag behind bulk crystals in performance.
• Existing methods often require complex stabilization systems.

Purpose of the Study:

• To implement a high-performance single-photon source using 2D materials.
• To achieve bright, pure single-photon emission without active stabilization.
• To demonstrate the potential for 2D materials in quantum technologies.

Main Methods:

• Coupling a WSe2 monolayer to a tunable optical cavity.
• Operating the device in a liquid-helium-free cryostat.
• Characterizing photon purity and brightness using quantum optics techniques.

Main Results:

• Achieved high single-photon purity (g(2)(0) = 4.7 ± 0.7%).
• Demonstrated record first-lens brightness of 65 ± 4% for linearly polarized photons.
• Observed two-photon interference in a Hong-Ou-Mandel experiment.

Conclusions:

• Atomically thin WSe2 coupled to optical cavities offer a promising platform for quantum applications.
• This approach represents a significant advancement over previous 2D material-based sources.
• The combination of 2D materials and open cavities is a key avenue for future quantum optoelectronic devices.