Photon antibunching from a single quantum-dot-microcavity system in the strong coupling regime.

Area of Science:

• Quantum optics
• Solid-state physics
• Nanophotonics

Background:

• Single quantum dots coupled to optical cavities are crucial for quantum technologies.
• Achieving strong coupling is essential for efficient single-photon generation.
• Background emitters often hinder the performance of quantum devices.

Purpose of the Study:

• To demonstrate an on-demand single-photon source in the strong coupling regime.
• To investigate photon emission properties of a quantum dot-pillar microcavity system.
• To characterize the performance of the single-photon source.

Main Methods:

• Utilizing a single quantum dot strongly coupled to a pillar microcavity.
• Employing resonant pumping via an excited state to isolate the quantum dot emission.
• Spectrally detuning the quantum dot from the cavity mode to observe emission characteristics.

Main Results:

• Observed photon antibunching from the strongly coupled system.
• Demonstrated antibunched and anticorrelated emission from both quantum dot and cavity.
• Achieved a Purcell factor of 61±7 and a quantum efficiency of 97%.

Conclusions:

• The developed device serves as an on-demand single-photon source in the strong coupling regime.
• Resonant pumping effectively suppresses background emitters, enabling clear observation of quantum dot emission.
• The high performance metrics indicate suitability for advanced quantum information processing and communication.