A5017851684- Quantum and electron transport phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Quantum Information and Cryptography
- Photonic Crystals and Applications
- Surface and Thin Film Phenomena
- Semiconductor materials and interfaces
- Industrial Vision Systems and Defect Detection
- Quantum Computing Algorithms and Architecture
- Integrated Circuits and Semiconductor Failure Analysis
- Explainable Artificial Intelligence (XAI)
- ECG Monitoring and Analysis
- Magnetic properties of thin films
- Advanced Thermodynamics and Statistical Mechanics
- Electronic and Structural Properties of Oxides
Intel (United States)
2024
University of Wisconsin–Madison
2017-2023
UNSW Sydney
2023
Building a fault-tolerant quantum computer will require vast numbers of physical qubits. For qubit technologies based on solid-state electronic devices
The energies of valley-orbit states in silicon quantum dots are determined by an as yet poorly understood interplay between interface roughness, orbital confinement, and electron interactions. Here, we report measurements one- two-electron state the dot potential is modified changing gate voltages, calculate these same using full configuration interaction calculations. results enable understanding physical contributions a new probe well interface.
Identifying and ameliorating dominant sources of decoherence are important steps in understanding improving quantum systems. Here we show that the free induction decay time ($T_{2}^{*}$) Rabi rate ($\Gamma_{\mathrm{Rabi}}$) dot hybrid qubit can be increased by more than an order magnitude appropriate tuning parameters operating points. By spin-like regime this qubit, choosing increase qubit's resilience to charge noise (which is presently limiting source for qubit), achieve a Ramsey...
Multi-electron semiconductor quantum dots have found wide application in qubits, where they enable readout and enhance polarizability. However, coherent control such has typically been restricted to only the lowest two levels, strongly interacting regime not realized. Here we report of eight different resonances a silicon-based dot. We use qubit perform spectroscopy, revealing dense set energy levels with characteristic spacing far smaller than single-particle energy. By comparing full...
Silicon-germanium heterostructures have successfully hosted quantum dot qubits, but the intrinsic near-degeneracy of two lowest valley states poses an obstacle to high fidelity computing. We present a modification Si/SiGe heterostructure by inclusion spike in germanium concentration within well order increase splitting. The is grown chemical vapor deposition and magnetospectroscopy performed on gate-defined dots measure excited state spectrum. demonstrate large widely tunable splitting as...
Far-off-resonant couplings are useful in quantum computing because they do not require special tunings of device components, but still await further exploration. The authors use a ``flip-chip'' coupling geometry to unequivocally demonstrate the presence far-off-resonant longitudinal between quantum-dot charge qubit and microwave cavity, which can be turned on or off at will. This work provides powerful versatile tool for reading out qubits over large distances.
Understanding the interactions that couple gate-defined quantum-dot qubits is an important step to using such devices in quantum computing. For double-quantum-dot with effective charge dipole moment, a capacitive dipole-dipole interaction can yield coherent coupling between neighboring qubits. Here researchers reveal tunability of this capacitive-coupling energy applied gate voltages quadruple-quantum-dot array, tuning from 15 32 GHz. Modeling system as network nodes joined by capacitors,...
Abstract Fast operations, an easily tunable Hamiltonian, and a straightforward two-qubit interaction make charge qubits useful tool for benchmarking device performance exploring dynamics. Here, we tune linear chain of four Si/SiGe quantum dots to host two double dot qubits. Using the capacitance between mediate strong interaction, simultaneously drive coherent transitions generate correlations We then sequentially pulse one qubit conditionally on state other. find that conditional π...
Valley splitting affects the energy dispersion of silicon quantum dot qubits, and occasionally manifests itself through some striking features. Here, authors observe a strong correlation between unexpected ``sweet spots'' ``hot in coherence rates quantum-dot hybrid qubit anomalous features dispersion. Through tight-binding simulations, they are able to attribute such effects disorder at quantum-well interface speculate on possibility harnessing enhance times.
In the physical sciences, there is an increased need for robust feature representations of image data: acquisition, in generalized sense two-dimensional data, now widespread across a large number fields, including quantum information science, which we consider here. While traditional features are widely utilized such cases, their use rapidly being supplanted by Neural Network-based techniques that often sacrifice explainability exchange high accuracy. To ameliorate this trade-off, propose...
Latching techniques are widely used to enhance readout of qubits. These methods require precise tuning multiple tunnel rates, which can be challenging achieve under realistic experimental conditions, such as when a qubit is coupled single reservoir. Here, we present method for single-shot measurement quantum dot with reservoir using latched-readout scheme. Our approach involves pulsing barrier gate dynamically control qubit-to-reservoir that readily applicable the latched various spin-based...
Intels efforts to build a practical quantum computer are focused on developing scalable spin-qubit platform leveraging industrial high-volume semiconductor manufacturing expertise and 300 mm fabrication infrastructure. Here, we provide an overview of the design, fabrication, demonstration new customized test chip, which contains 12-quantum-dot linear arrays, code named Tunnel Falls. These devices fabricated using immersion extreme ultraviolet lithography (EUV), along with other standard...
A primary method of reading out a quantum dot hybrid qubit involves projection the logical basis onto distinct charge states that are readily detected by an integrated sensing dot. However, in simplest configuration, excited state decays rapidly, making single-shot readout challenging. Here, we demonstrate procedure where is latched to metastable configuration whose lifetime tunnel-rate limited, persisting here as long 2.5 ms. Additionally, show working (4,1)–(3,2) enables window larger and...
Fast operations, an easily tunable Hamiltonian, and a straightforward two-qubit interaction make charge qubits useful tool for benchmarking device performance exploring dynamics. Here, we tune linear chain of four Si/SiGe quantum dots to host two double dot qubits. Using the capacitance between mediate strong interaction, simultaneously drive coherent transitions generate correlations We then sequentially pulse one qubit conditionally on state other. find that conditional $\pi$-rotation can...