Research Projects – To Be Delete

This project is part of the ARC Training Centre Future Leaders in Quantum Computing Program (FLiQC). Noise is the biggest challenge of quantum computing. Quantum systems are highly sensitive and interact with their environment. For the execution of a quantum algorithm, we need to prepare qubits in a desired quantum state, apply several gates, and finally measure the qubits. This is the standard circuit model of quantum computing and is the most applicable to current quantum devices, such as superconducting qubits and neutral atoms. The environment affects every timestep of these circuits, both independently and in a correlated manner. This means that noise across the different stages of a quantum algorithm is correlated in time, leading to what we call non-Markovian, or correlated, noise. This type of noise is present in most current quantum devices and starts to be a limiting factor in scaling the technology. 

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.

This project is part of the CSIRO Next Generation Quantum Graduates Scholarship Program (NGQGP). Diraq is a Sydney-based quantum computing company, delivering revolutionary quantum computing to the world, based on existing silicon chip technology. This immersive PhD project at Diraq provides students with hands-on experience in silicon MOS based quantum computing. Under expert guidance, participants contribute to cutting-edge projects, receive tailored mentorship, and engage in specialised training, enriching both their academic journey and industry prospects. 

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.