Cryogenic Quantum Optics

To trial the “quantum” nature of light emitted by nanostructures it is often necessary to cool down samples around -265°C, or less. The quantum optic laboratory has a cryostat which allows to optically excite (lasers) samples (infrared light) and collect the emitted light, probing its quantum nature.

Quantum optics cryogenic laboratory

The quantum optics laboratory comprises a closed cycle cryogenic and low vibration probe station with optical access, coupled to laser excitation (from green to near infrared, pulsed and continuous) and collection path. Two spectrometers are present covering from green to telecom wavelengths (CCD and InGaAs array) and a photon correlation set-up allows to probe single and entangled photon emission in the near infrared (~700-960 nm). Two photon resonant pumping set-up available in some limited wavelength windows.

Dry cryogenic cryostat and probe-station, low vibrations, pulsed optical pumping, correlation spectroscopy

Sample size: 1cm×1cm max
Pumping suite: Suite of lasers covering visible to near infrared.
Tuneable pulsed excitation with femtosecond Ti-Saph laser, pulsed shaping to ps available.
Probe-station vertical vibrations below a few tens of nm
Lowest T achievable: 6K

Ascent+ facility

Platform Technology

  • Nano for Quantum Technologies

Key Enabling Capability

  • Metrology / Characterisation: Optical characterisation

Entangled photon emission from quantum dots has been demonstrated:
[DOI: 10.1038/nphoton.2013.128] and [DOI: 10.1038/nphoton.2016.203]

Key Enabling Capability

Metrology / Characterisation

Platform Technology

Nano for Quantum Technologies