Solid-State Spectroscopy Quantum Computing Facilities

The solid-state spectroscopy laboratory is set up to perform high resolution coherent optical, microwave and radio frequency spectroscopy and quantum optics experiments on optically active centres in solid-state hosts. It is equipped with a suite of high-resolution lasers with sub-kilohertz resolution and wavelengths tuneable over a wide range of the visible and near infrared spectrum. There is a range of liquid helium cryostats available, including continuous flow, bath, adsorption and bucket designs. Temperatures down to 250mK are accessible and magnetic fields up to 15T can be applied. Bulk crystalline samples are grown in the dedicated crystal-growing laboratory.

There is access to a range of equipment supporting the fabrication and characterisation of waveguide devices housed within the Laser Physics Centre and he ANU’s node of the Australian National Nano-Fabrication Facility. This includes electron beam, thermal and pulsed laser deposition systems for thin film growth and electron beam, direct write laser and photo lithography used in conjunction with plasma etching for waveguide fabrication.

For characterisation, the available equipment includes a Raman spectrometer, atomic-force microscope, optical profiler as well as x-ray diffraction and electron paramagnetic resonance facilities. The research efforts are further supported by the Research School of Physics facilities.

This includes access to electrical and mechanical engineering support along with access to cryogenic liquids, including helium recovery and on-site liquefaction.

Quantum Memory Laboratory

The quantum memory laboratory contains a range of state-of-the-art laser equipment. There are four ultra-stable vibration isolated optical tables each dedicated to different aspects of probing atom-light interactions. There are two tuneable titanium-sapphire lasers used to generate the stable laser fields used for manipulation of the quantum memory scheme. The cold atom ensembles are trapped and cooled using an array of diode lasers and amplifiers that are controlled by custom software and optimised using a machine learning algorithm.

The cold atomic ensembles are collected in an ultra-high vacuum chamber that is carefully designed for maximum optical access. The quantum memory laboratory also has a neural network based artificial intelligence system that is capable of optimising multi-parameter high dimensional experiments. It can be used in a live, on-line feedback loop and is remote accessible via the NVIDIA P100 GPU.

Quantum Communication Laboratory

The Quantum Communication Laboratory contains five large, ultra-stable and vibration isolated optical benches in a temperature-controlled dust proof room. The laboratory contains many state-of-the-art laser sources, including frequency-doubled Innolight Nd:YAG and diode laser systems producing beams at 1064 nm and 532 nm. The lab also has tuneable diode laser producing light from the visible spectrum to the near infrared as well as a fibre laser source at 1550 nm. These sources are used to pump optical parametric amplifiers of various geometries to produce non-classical states of light such as squeezed states and entangled states. To test quantum communication protocols, we have access to in-ground dark fibre loops from the ACT ICON network that are deployed in and around the National Parliamentary Triangle of Canberra.

This laboratory also hosts the ANU Quantum Random Number Generator Server – a server that measures vacuum fluctuations to generate random numbers online

Quantum Materials Integration Laboratory

The Quantum Materials Integration Laboratory located in the School of Engineering at ANU houses a chemical vapour deposition (CVD) system to grow high-quality two-dimensional (2D) quantum materials. This includes a stage to deposit 2D materials by mechanical exfoliation and precise hetero-structure stacking. The lab also hosts an atomic force microscope (AFM), for nano-material imaging with picometre resolution, a micro-raman and micro-photoluminescence (PL) systems, for 2D material imaging and characterisations. Both systems can work at temperatures ranging from 4K up to 600K. The PL system has several detectors working in a wavelength ranging from 300 to 1600 nm and has a wavelength-tunable excitation fs laser with wavelength ranging from 400 to 2000nm.

The lab also hosts an advanced multi-functional Electro-Opto-Magneto-Mechanical (EOMM) analysis platform funded by an ARC LIEF project, a total budget of A$1.24 million) for characterising nanomaterials and nanoscale devices. The platform includes an fs laser (80 MHz, 100 fs) with wavelength gapless tunable from 345 nm to 2500 nm (four beams output). This platform performs ultrafast and optical nonlinearity measurements, including, second harmonic generation (SHG), spontaneous parametric down-conversion (SPDC), single photon generation and detection.

Quantum Control Laboratory

The quantum control laboratory contains two ultra-stable and vibration isolated optical benches in a temperature-controlled dust proof room. In addition, a state-of-the-art laser source at 1550nm used to pump optical parametric amplifiers of various geometries to produce non-classical states of light. It is also used to pump waveguide quantum optical systems.

Ultra-Precision Lathe Facility

ANU’s Ultra-Precision Lathe Facility can custom machine metal and certain classes of optical crystals to optical-grade precision. The facility houses a Moore Nanotech 250 UPL lathe with a stiff air-bearing spindle. Depending on the material and the complexity of the form, surface smoothness of up to l/50 may be attainable. The lathe has precision four-axes control and can fabricate non-cylindrically symmetric optical components with size ranging from tens of micrometres to tens of centimetres.