A5006045678- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Diamond and Carbon-based Materials Research
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Force Microscopy Techniques and Applications
- High-pressure geophysics and materials
- Quantum-Dot Cellular Automata
- Mechanical and Optical Resonators
- Quantum Chromodynamics and Particle Interactions
- Quantum Mechanics and Applications
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Semiconductor Quantum Structures and Devices
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Electronic and Structural Properties of Oxides
- Molecular Junctions and Nanostructures
- Advanced Electron Microscopy Techniques and Applications
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Surface and Thin Film Phenomena
- Theoretical and Computational Physics
The University of Melbourne
2016-2025
Centre for Quantum Computation and Communication Technology
2015-2024
Quantum (Australia)
2003-2023
ARC Centre of Excellence in Future Low-Energy Electronics Technologies
2021
Monash University
2021
UNSW Sydney
2012-2014
Laboratory for Social and Neural Systems Research
2013
Australian Research Council
2007-2010
Jet Propulsion Laboratory
2010
Delft University of Technology
2010
This review describes recent groundbreaking results in Si, $\mathrm{Si}/\mathrm{SiGe}$, and dopant-based quantum dots, it highlights the remarkable advances Si-based physics that have occurred past few years. progress has been possible thanks to materials development of Si devices, physical understanding effects silicon. Recent critical steps include isolation single electrons, observation spin blockade, single-shot readout individual electron spins both dopants gated dots Si. Each these...
The negatively charged nitrogen-vacancy (NV-) center in diamond has realized new frontiers quantum technology. Here, the center's optical and spin resonances are observed under hydrostatic pressures up to 60 GPa. Our observations motivate powerful techniques measure pressure image high magnetic electric phenomena. further reveal a fundamental inadequacy of current model provide insight into its electronic structure.
Large-scale quantum computation will only be achieved if experimentally implementable error correction procedures are devised that can tolerate achievable rates. We describe a procedure requires 2-D square lattice of qubits interact with their nearest neighbors, yet gate rates over 1%. The precise maximum tolerable rate depends on the model, and we calculate values in range 1.1--1.4% for various physically reasonable models. Even lowest value represents highest threshold calculated to date...
Lifetime limited optical excitation lines of single nitrogen vacancy (NV) defect centers in diamond have been observed at liquid helium temperature. They display unprecedented spectral stability over many seconds and cycles. Spectral tuning the spin selective resonances was performed via application an external electric field (i.e. Stark shift). A rich variety shifts were including linear as well quadratic components. The ability to tune NV has potential applications quantum information processing.
The ground state spin of the negatively charged nitrogen-vacancy center in diamond has been platform for recent rapid expansion new frontiers quantum metrology and solid information processing. In ambient conditions, demonstrated to be a high precision magnetic electric field sensor as well qubit capable coupling with nearby nuclear electronic spins. However, spite its many outstanding demonstrations, theory not yet fully developed there does currently exist thorough explanations properties,...
Wiring Up Silicon Surfaces One of the challenges in downsizing electronic circuits is maintaining low resistivity wires, because shrinking their diameter to near atomic dimensions increases interface effects and can decrease effectiveness dopants. Weber et al. (p. 64 ; see Perspective by Ferry ) created nanowires on a silicon surface with deposition phosphorus atoms through decomposition PH 3 scanning tunneling microscope tip. A brief thermal annealing embedded these nanowires, which varied...
Here we report the increase of coherence time T$_2$ a single electron spin at room temperature by using dynamical decoupling. We show that Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence can prolong Nitrogen-Vacancy center in diamond up to 2.44 ms compared Hahn echo measurement where T$_2 = 390 \mu$s. Moreover, performing locking experiments demonstrate with CPMG maximum possible $T_2$ is reached. On other hand, do not observe strong nanodiamonds, possibly due short lattice relaxation...
The exceptionally long quantum coherence times of phosphorus donor nuclear spin qubits in silicon, coupled with the proven scalability silicon-based nano-electronics, make them attractive candidates for large-scale computing. However, high threshold topological error correction can only be captured a two-dimensional array operating synchronously and parallel-posing formidable fabrication control challenges. We present an architecture that addresses these problems through novel shared-control...
We demonstrate diamond-based quantum imaging of the current flow in graphene structures with submicrometer resolution.
Characterisation protocols have so far played a central role in the development of noisy intermediate-scale quantum (NISQ) computers capable impressive feats. This trajectory is expected to continue building next generation devices: ones that can surpass classical for particular tasks -- but progress characterisation must keep up with complexities intricate device noise. A missing piece zoo procedures tomography which completely describe non-Markovian dynamics over given time frame. Here, we...
Solid-state quantum computer architectures with qubits encoded using single atoms are now feasible given recent advances in the atomic doping of semiconductors. Here we present a charge qubit consisting two dopant semiconductor crystal, one which is singly ionized. Surface electrodes control and radio-frequency single-electron transistor provides fast readout. The calculated gate times, order 50 ps or less, much shorter than expected decoherence time. We propose universal one- two-qubit...
We describe a scheme for using an all-electrical, rapid, adiabatic population transfer between two spatially separated dots in triple-quantum dot system. The electron spends no time the middle and does not change its energy during process. Although coherent method, this may well prove useful incoherent electronic computation (for example quantum-dot cellular automata) where it provide advantage to otherwise device. It can also be thought of as limiting case type II quantum computing,...
Through the introduction of a new electron spin transport mechanism, 2D donor quantum computer architecture is proposed. This design addresses major technical issues in original Kane design, including spatial oscillations exchange coupling strength and cross-talk gate control. It also expected that degree non-locality qubit gates will significantly improve scaling fault-tolerant threshold over nearest-neighbour linear array.
The surface code is unarguably the leading quantum error correction for 2-D nearest neighbor architectures, featuring a high threshold rate of approximately 1%, low overhead implementations entire Clifford group, and flexible, arbitrarily long-range logical gates. These highly desirable features come at cost significant classical processing complexity. We show how to perform associated with an nxn lattice qubits, each being manipulated in realistic, fault-tolerant manner, O(n^2) average time...
A serial triple quantum dot (TQD) electrostatically defined in a $\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}$ heterostructure is characterized by using nearby point contact as charge detector. Ground-state stability diagrams demonstrate control the regime of few electrons charging TQD. An electrostatic model developed to determine ground-state configurations Numerical calculations are compared with experimental results. In addition, tunneling conductance through all three dots...
A quantitative understanding of the dynamics biological neural networks is fundamental to gaining insight into information processing in brain. While techniques exist measure spatial or temporal properties these networks, it remains a significant challenge resolve with subcellular resolution. In this work we consider fundamentally new form wide-field imaging for neuronal based on nanoscale magnetic field sensing optically active spins diamond substrate. We analyse sensitivity system...
Significant attention has been recently focused on the realization of high precision nanothermometry using spin-resonance temperature shift negatively charged nitrogen-vacancy (${\mathrm{NV}}^{\ensuremath{-}}$) center in diamond. However, precise physical origins is yet to be understood. Here, shifts center's optical and spin resonances are observed a model developed that identifies origin each combination thermal expansion electron-phonon interactions. Our results provide insight into...