A5080265770- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Semiconductor Quantum Structures and Devices
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor materials and devices
- Gyrotron and Vacuum Electronics Research
- Surface and Thin Film Phenomena
- Molecular Junctions and Nanostructures
- Quantum Computing Algorithms and Architecture
- Photonic and Optical Devices
- Computability, Logic, AI Algorithms
- Music and Audio Processing
- Advancements in Semiconductor Devices and Circuit Design
- Mass Spectrometry Techniques and Applications
- Music Technology and Sound Studies
- Neural Networks and Reservoir Computing
- Terahertz technology and applications
- Laser-Matter Interactions and Applications
- Electrical and Bioimpedance Tomography
- Neural Networks and Applications
- Spectroscopy and Quantum Chemical Studies
- Orbital Angular Momentum in Optics
- Integrated Circuits and Semiconductor Failure Analysis
Centre for Quantum Computation and Communication Technology
2025
UNSW Sydney
2025
Institut polytechnique de Grenoble
2017-2024
Université Grenoble Alpes
2017-2024
Centre National de la Recherche Scientifique
2017-2024
Institut Néel
2017-2024
Graz University of Technology
2015
Institute of Solid State Physics
2015
Abstract Surface acoustic waves (SAWs) strongly modulate the shallow electric potential in piezoelectric materials. In semiconductor heterostructures such as GaAs/AlGaAs, SAWs can thus be employed to transfer individual electrons between distant quantum dots. This mechanism makes SAW technologies a promising candidate convey information through circuit of logic gates. Here we present two essential building blocks SAW-driven circuit. First, implement directional coupler allowing partition...
The progress of charge manipulation in semiconductor-based nanoscale devices opened up a novel route to realise flying qubit with single electron. In the present review, we introduce concept these electron qubits, discuss their most promising realisations and show how numerical simulations are applicable accelerate experimental development cycles. Addressing technological challenges qubits that currently faced by academia quantum enterprises, underline relevance interdisciplinary cooperation...
Spin qubits in silicon are strong contenders for the realization of a practical quantum computer. Single- and two-qubit gates have shown fidelities above fault-tolerant threshold, entanglement three has been achieved. Furthermore, high-fidelity operation algorithms is possible. Here we implement four-qubit processor with all control threshold. We demonstrate three-qubit Grover's search algorithm ~95% probability finding marked state. To this end, fabricate from phosphorus atoms...
The synthesis of single-cycle pulses compressed light and microwave signals sparked novel areas fundamental research. In the field acoustics, however, such a generation has not been introduced yet. For numerous applications, large spatial extent surface acoustic waves (SAW) causes unwanted perturbations limits accuracy physical manipulations. Particularly, this restriction applies to SAW-driven quantum experiments with single flying electrons, where extra modulation renders exact position...
Surface acoustic waves (SAW) have large potential to realize quantum-optics-like experiments with single flying electrons employing their spin or charge degree of freedom. For such quantum applications, highly efficient trapping the electron in a specific moving dot (QD) SAW train plays key role. Probabilistic transport over multiple minima would cause uncertainty synchronisation that is detrimental for coherence entangled and in-flight operations. It thus central importance identify device...
The electron wave function experiences a phase modification at coherent transmission through quantum dot. This undergoes characteristic shift of $\pi$ when scanning Coulomb-blockade resonance. Between successive resonances either lapse or plateau is theoretically expected to occur depending on the parity corresponding dot states. Despite considerable experimental effort, this behaviour has remained elusive for large Here we report measurements across such hosting hundreds electrons. Using an...
Abstract The displacement of a single electron enables exciting avenues for nanotechnology with vast application potential in quantum metrology, communication and computation. Surface acoustic waves (SAW) have proven itself as surprisingly useful solution to perform this task over large distance outstanding precision reliability. Over the last decade, important milestones been achieved bringing SAW-driven single-electron transport from first proof-of-principle demonstrations accurate,...
Surface acoustic waves (SAWs) are a reliable solution to the transport of single electrons with precision in piezoelectric semiconductor devices. Recently, highly efficient single-electron strongly compressed single-cycle pulse has been demonstrated. This approach, however, requires surface gates constituting quantum dots, their wiring, and multiple gate movements load unload electrons, which is very time-consuming. Here, on contrary, we employ such much simpler way---without any dot at...
Single-electron sources are vital for modern nanoelectronics, enabling advances in the emerging field of electron quantum optics. However, their performance is limited by current method generating single electrons applying Lorentzian voltage pulses on Fermi sea a conductor. The authors introduce Fourier synthesis-based pulse generator, allowing generation and in-situ characterization 27-ps wave packet an electronic Mach-Zehnder interferometer. This advancement can potentially enable study...
The work function of metal substrates can be easily tuned, for instance, by adsorbing layers molecular electron donors and acceptors. In this work, we discuss the possibility changing donor/acceptor mixing ratio reversibly after adsorption choosing a pair that is coupled via redox reaction in equilibrium with surrounding gas phase. We such situation example tetrafluoro-1,4-benzenediol (TFBD)/tetrafluoro-1,4-benzoquinone (TFBQ), adsorbed on Cu(111) Ag(111) surfaces. use density functional...
Electron flying qubits are envisioned as potential information link within a quantum computer, but also promise -- alike photonic approaches self-standing processing unit. In contrast to its counterpart, electron-quantum-optics implementations subject Coulomb interaction, which provide direct route entangle the orbital or spin degree of freedom. However, controlled interaction electrons at single particle level has not yet been established experimentally. Here we report antibunching pair...
Spin qubits in silicon are strong contenders for realizing a practical quantum computer. This technology has made remarkable progress with the demonstration of single and two-qubit gates above fault-tolerant threshold entanglement up to three qubits. However, maintaining high fidelity operations while executing multi-qubit algorithms remained elusive, only being achieved two spin date due small qubit size, which makes it difficult control without creating crosstalk errors. Here, we use...
Electronic flying qubits offer an interesting alternative to photonic qubits: electrons propagate slower, hence easier control in real time, and Coulomb interaction enables direct entanglement between different qubits. While their coherence time is limited, picosecond-scale would make them competitive terms of number possible coherent operations. The key challenge lies achieving the dynamical regime, where injected plasmonic pulse width shorter than quantum device dimensions. Here we reach...
We study the interaction between two closely spaced but electrically isolated quasi-one-dimensional electrical wires by a drag experiment. In this work we experimentally demonstrate generation of current in an unbiased (drag) wire, which results from interactions with neighboring biased (drive) wire. The direction depends on length one-dimensional wire respect to position barrier When additionally form potential drive is determined relative barriers. interpret behavior terms electron...
Surface acoustic waves (SAWs) are a reliable solution to transport single electrons with precision in piezoelectric semiconductor devices. Recently, highly efficient single-electron strongly compressed single-cycle pulse has been demonstrated. This approach, however, requires surface gates constituting the quantum dots, their wiring, and multiple gate movements load unload electrons, which is very time-consuming. Here, on contrary, we employ such much simpler way - without any dot at...
The synthesis of single-cycle, compressed optical and microwave pulses sparked novel areas fundamental research. In the field acoustics, however, such a generation has not been introduced yet. For numerous applications, large spatial extent surface acoustic waves (SAW) causes unwanted perturbations limits accuracy physical manipulations. Particularly, this restriction applies to SAW-driven quantum experiments with single flying electrons, where extra modulation renders exact position...