Facilities

Cryogenic Measurement Laboratories

University: UNSW Sydney

Venue City: Sydney

School / Faculty: CQC2T

The Centre hosts a series of Cryogenic Measurement Laboratories, across both the Newton and Old Main Building at UNSW Sydney with Centre researchers having access to up to 10 dilution fridges. These form an extensive set of experimental facilities for characterization and measurements of devices for the silicon qubit projects at UNSW.

The laboratories house a collection of dry and wet dilution refrigerators from various vendors (Oxford, Leiden and Blufors) allowing quantum electronic measurements at temperatures down to 10 mK and in magnetic fields up to 7T. Typical qubit experiments require measuring voltage signals in the pV range, from DC to 50 GHz microwave frequencies, using fast pulsing, arbitrary waveforms, and laser light sources, and all of which are installed and readily available.

Real-time data acquisition and fast feedback techniques are available, and pulsed local electron spin resonance experiments are routinely conducted. All set-ups have ultra-low noise and high bandwidth current amplifiers, allowing detection of currents in the pA range with < 10 microseconds time resolution, or fA at low frequency. Optical access is available for some dilution fridges and this led to the first observation of resonant photo-ionization of a dopant atom by single shot charge sensing with 50neV resolution.

The solid-state qubit measurements in the Centre are fully supported by a Helium liquefier plant. This $2M facility from the Faculty of Science allows measurements to run uninterrupted. thereby reducing reliance on the commercial supply of liquid Helium. The laboratory is supported by two professional staff members with extensive experience in cryogenics and RF measurement systems.