Research Projects – To Be Delete

Narrow linewidth lasers are important tools in applications such as atom trapping and cooling, qubit control, optical clocks and quantum sensing. Their stabilization currently cumbersome systems involving optics under ultra-high vacuum and at cryogenic temperatures to achieve the exacting precision required. This project investigates a novel concept that uses laser action in diamond to simultaneously narrow laser linewidth and stabilize frequency. The approach aims to radically reduce the laser system size, to enable field or space-borne quantum applications that require portable systems.

The project aims to apply advanced microwave engineering methods to the control of spin-based qubits in silicon. The aim is to solve two key limitations that still affect their performance: (i) operation speed, and (ii) readout and initialization fidelity. The first is determined by the amount of microwave power delivered to the quantum chip –higher power yields faster operations. The second depends on the temperature of the chip – colder temperature initializes the qubits to their lowest-energy state with higher probability.

Quantum simulators aim to describe the properties of quantum systems that would otherwise be too difficult to simulate on ordinary computers. In particular, analog quantum simulators—which do not require universal, programmable quantum computers—are likely to be the first practical quantum computing devices.

Our goal is to simulate the outcomes of chemical reactions that are beyond the capabilities of conventional computers, which would have transformative impacts from materials and energy science to drug discovery.

Graphene, a single layer of carbon atoms with honeycomb lattice structure, shows many exotic physics and promising properties for device applications. Stacking different layers together provides a degree of freedom to change electronic properties of graphene, such as electronic band structures. In this project, the successful applicant will work with a team from QED group from School of Phyiscs at UNSW to explore effect of different stacking order on electronic properties of ABA- and ABC- stacked trilayer graphene. The successful applicant will participate in fabrication of van der Waals heterostructure and measuring their electronic properties in an environment of ultracold temperatures and high magnetic fields.

Complex light fields used in optical tweezers require advanced optical manipulation and control of the laser beam. The project focusses on the design, experimental setup and characterization of a beam auto-aligner system on a Raspberry Pi controlled stepper motor. The system will be used for maintaining and manipulating the intensity distribution of the laser beam and precise optical beamshaping by a spatial light modulator patterned optical trap for cold atoms. The work involves developing a machine learning algorithm for optimization of the “walking the beam” technique, used in most quantum optics experiments and control of structured light for advanced optical manipulation. The algorithm can be used to optimize the laser power into optical fibers, better modulation of the amplitude and phase of light and for controlling of the overlapping beams in a pump-probe experimental setup. The precise control of the laser beam intensity distribution enables the fine tuning of configurable potential wells for future optimized optical trapping experiments.