A5087719301- Quantum and electron transport phenomena
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Quantum Information and Cryptography
- Topological Materials and Phenomena
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor Quantum Structures and Devices
- Silicon Carbide Semiconductor Technologies
- Photonic and Optical Devices
- Metal and Thin Film Mechanics
- Acoustic Wave Resonator Technologies
- Advanced Semiconductor Detectors and Materials
- Radiopharmaceutical Chemistry and Applications
- Electron and X-Ray Spectroscopy Techniques
- Quantum Computing Algorithms and Architecture
- Adhesion, Friction, and Surface Interactions
- Lung Cancer Diagnosis and Treatment
- Molecular Junctions and Nanostructures
- Cold Atom Physics and Bose-Einstein Condensates
- Medical Imaging Techniques and Applications
- Diamond and Carbon-based Materials Research
- Magnetic properties of thin films
- Surface and Thin Film Phenomena
Microsoft (United States)
2025
UNSW Sydney
2020-2022
Quantum (Australia)
2022
Centre for Quantum Computation and Communication Technology
2020-2021
Cavendish Hospital
2014-2017
University of Cambridge
2012-2015
Single spin qubits based on phosphorus donors in silicon are a promising candidate for large-scale quantum computer. Despite long coherence times, achieving uniform magnetic control remains hurdle scale-up due to challenges high-frequency field at the nanometre scale. Here, we present proposal flopping-mode electric dipole resonance qubit combined electron and nuclear states of double donor dot. The key advantage utilizing donor-based system is that can engineer number nuclei each By...
We report low-temperature transport spectroscopy of a graphene quantum dot fabricated by atomic force microscope nanolithography. The excellent spatial resolution the allows us to reliably fabricate dots with short constrictions less than 15 nm in length. Transport measurements demonstrate that device is dominated single over wide gate range. electron spin system investigated applying an in-plane magnetic field. results are consistent Landé g-factor ∼2 but no regular filling sequence...
We study an epitaxial graphene monolayer with bilayer inclusions via magnetotransport measurements and scanning gate microscopy at low temperatures. find that can be metallic or insulating depending on the initial gated carrier density. The bilayers act as equipotential shorts for edge currents, while closely spaced guide flow of electrons in constriction, which was locally using a probe.
Electrically addressing spin systems is predicted to be a key component in developing scalable semiconductor-based quantum-processing architectures, enable fast spin-qubit manipulation and long-distance entanglement via microwave photons. However, single spins have no electric dipole, therefore spin-orbit mechanism must integrated the qubit design. Here, we propose couple photons atomically precise donor devices silicon using hyperfine interaction intrinsic an electrically induced coupling....
The fusion of non-Abelian anyons or topological defects is a fundamental operation in measurement-only quantum computation. In superconductors, this amounts to determination the shared fermion parity Majorana zero modes. As step towards this, we implement single-shot interferometric measurement indium arsenide-aluminum heterostructures with gate-defined nanowire. interferometer formed by tunnel-coupling proximitized nanowire dots. causes state-dependent shift these dots' capacitance up 1 fF....
We investigate the effect of a perpendicular magnetic field on single-particle charging spectrum graphene quantum dot embedded inline with nanoribbon. observe uniform shifts in which coincide peaks magnetoconductance, implicating Landau level condensation and edge state formation as mechanism underlying field-enhanced transmission through nanostructures. The experimentally determined ratio bulk to states is supported by band-structure simulations, while fourfold beating Coulomb blockade...
Spins in the `semiconductor vacuum' of silicon-28 ($^{28}$Si) are suitable qubit candidates due to their long coherence times. An isotopically purified substrate $^{28}$Si is required limit decoherence pathway caused by magnetic perturbations from surrounding $^{29}$Si nuclear spins (I=1/2), present natural Si (nat Si) at an abundance 4.67%. We enrich surface layers nat sputtering using high fluence $^{28}$Si$^-$ implantation. Phosphorus (P) donors implanted into one such layer with ~3000...
We investigate mesoscopic Josephson-junction arrays created by patterning superconducting disks on monolayer graphene, concentrating the high-$T/{T}_{c}$ regime of these devices and phenomena which contribute to glass state in diffusive arrays. observe features magnetoconductance at rational fractions flux quanta per array unit cell, we attribute formation flux-quantized vortices. The applied fields occur are well described Ginzburg-Landau simulations that take into account number cells...
Kinetic inductance travelling-wave parametric amplifiers (KTWPAs) are emerging as core components in many applications where wideband cryogenic rf amplification at or near the quantum limit of added noise is critical. What unique about these thin film superconducting devices and what makes them suitable for a wide range their ability to simultaneously provide large dynamic quantum-limited single photon 100,000s signals. However, despite promising performance co-planar NbTiN thin-film KTWPAs,...
We study electron transport in nanostructures patterned bilayer graphene patches grown epitaxially on SiC as a function of doping, magnetic field, and temperature. Away from charge neutrality is only weakly modulated by changes carrier concentration induced local side-gate. At low n-type doping close to neutrality, resembles that exfoliated nanoribbons well described tunnelling single electrons through network Coulomb-blockaded islands. Under the influence an external Coulomb blockade...
Electrically addressing spin systems is predicted to be a key component in developing scalable semiconductor-based quantum processing architectures, enable fast qubit manipulation and long-distance entanglement via microwave photons. However, single spins have no electric dipole, therefore spin-orbit mechanism must integrated the design. Here, we propose couple photons atomically precise donor devices silicon using hyperfine interaction intrinsic an electrically-induced coupling. We...