Quantum Photonics

The quantum photonics platform integrates semiconductor quantum emitters with nanophotonic structures for controlled light-matter interactions. We develop heterogeneous integration techniques for coupling quantum dots and other emitters to metasurfaces, photonic crystals, and waveguide systems, enabling enhanced emission directionality, Purcell enhancement, and quantum light generation.

Experimental Capabilities

Cryogenic Quantum Emitter Characterization

We operate closed-cycle optical cryostats for low-temperature (4-300 K) characterization of quantum emitters. The system features wide-field and confocal microscopy configurations for locating and addressing individual emitters, with high-numerical-aperture objectives for efficient collection. Variable-temperature control enables temperature-dependent studies of emission properties and coherence.

Single-Photon Spectroscopy and Correlation Measurements

Our spectroscopy setup provides high-resolution emission analysis using precision grating spectrometers across visible to near-infrared wavelengths. Tunable excitation sources with sub-threshold operation ensure minimal perturbation of quantum states. For quantum light characterization, we employ superconducting nanowire single-photon detectors with sub-nanosecond timing resolution for g⁽²⁾(τ) correlation measurements.

Integrated Photonic Device Characterization

Transmission and reflection spectroscopy systems characterize the optical response of nanophotonic devices using broadband sources and high-dynamic-range detection. Polarization-resolved measurements with continuously variable analyzers reveal anisotropic responses and mode coupling effects. The setup accommodates various device geometries and substrate materials.