M. Y. Simmons
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View article: Roadmap on atomically-engineered quantum platforms
Roadmap on atomically-engineered quantum platforms Open
Matter at the atomic-scale is inherently governed by the laws of quantum mechanics. This makes charges and spins confined to individual atoms—and interactions among them—an invaluable resource for fundamental research and quantum technolog…
View article: An 11-qubit atom processor in silicon
An 11-qubit atom processor in silicon Open
Phosphorus atoms in silicon are an outstanding platform for quantum computing as their nuclear spins exhibit coherence time over seconds. By placing multiple phosphorus atoms within a radius of a few nanometers, they couple via the hyperfi…
View article: An 11-qubit atom processor in silicon
An 11-qubit atom processor in silicon Open
Phosphorus atoms in silicon are an outstanding platform for quantum computing as their nuclear spins exhibit coherence time over seconds [1, 2]. By placing multiple phosphorus atoms within a radius of a few nanometers, they couple via the …
View article: Do migrant women have equity of access to midwife continuity of care?
Do migrant women have equity of access to midwife continuity of care? Open
It is incumbent on health services to measure equity of access and adjust services to ensure equity of access for all populations.
View article: High-fidelity sub-microsecond single-shot electron spin readout above 3.5 K
High-fidelity sub-microsecond single-shot electron spin readout above 3.5 K Open
View article: Grover’s algorithm in a four-qubit silicon processor above the fault-tolerant threshold
Grover’s algorithm in a four-qubit silicon processor above the fault-tolerant threshold Open
View article: Roadmap on atomic-scale semiconductor devices
Roadmap on atomic-scale semiconductor devices Open
Spin states in semiconductors provide exceptionally stable and noise-resistant environments for qubits, positioning them as optimal candidates for reliable quantum computing technologies. The proposal to use nuclear and electronic spins of…
View article: Roadmap on Atomic-scale Semiconductor Devices
Roadmap on Atomic-scale Semiconductor Devices Open
Spin states in semiconductors provide exceptionally stable and noise-resistant environments for qubits, positioning them as optimal candidates for reliable quantum computing technologies. The proposal to use nuclear and electronic spins of…
View article: Measurement of Enhanced Spin‐Orbit Coupling Strength for Donor‐Bound Electron Spins in Silicon
Measurement of Enhanced Spin‐Orbit Coupling Strength for Donor‐Bound Electron Spins in Silicon Open
While traditionally considered a deleterious effect in quantum dot spin qubits, the spin‐orbit interaction is recently being revisited as it allows for rapid coherent control by on‐chip AC electric fields. For electrons in bulk silicon, sp…
View article: Machine Learning-Assisted Precision Manufacturing of Atom Qubits in Silicon
Machine Learning-Assisted Precision Manufacturing of Atom Qubits in Silicon Open
Donor-based qubits in silicon, manufactured using scanning tunneling microscope (STM) lithography, provide a promising route to realizing full-scale quantum computing architectures. This is due to the precision of donor placement, long coh…
View article: Noise Correlations in a 1D Silicon Spin Qubit Array
Noise Correlations in a 1D Silicon Spin Qubit Array Open
Correlated noise across multi-qubit architectures is known to be highly detrimental to the operation of error correcting codes and the long-term feasibility of quantum processors. The recent discovery of spatially dependent correlated nois…
View article: Measurement of enhanced spin-orbit coupling strength for donor-bound electron spins in silicon
Measurement of enhanced spin-orbit coupling strength for donor-bound electron spins in silicon Open
While traditionally considered a deleterious effect in quantum dot spin qubits, the spin-orbit interaction is recently being revisited as it allows for rapid coherent control by on-chip AC electric fields. For electrons in bulk silicon, SO…
View article: Grover's algorithm in a four-qubit silicon processor above the fault-tolerant threshold
Grover's algorithm in a four-qubit silicon processor above the fault-tolerant threshold Open
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 the fault-tolerant threshold and entanglement …
View article: High-fidelity initialization and control of electron and nuclear spins in a four-qubit register
High-fidelity initialization and control of electron and nuclear spins in a four-qubit register Open
View article: Superexchange coupling of donor qubits in silicon
Superexchange coupling of donor qubits in silicon Open
Atomic engineering in a solid-state material has the potential to functionalize the host with novel phenomena. STM-based lithographic techniques have enabled the placement of individual phosphorus atoms at selective lattice sites of silico…
View article: Impact of measurement backaction on nuclear spin qubits in silicon
Impact of measurement backaction on nuclear spin qubits in silicon Open
Phosphorus donor nuclear spins in silicon couple weakly to the environment making them promising candidates for high-fidelity qubits. The state of a donor nuclear spin qubit can be manipulated and read out using its hyperfine interaction w…
View article: Superexchange coupling of donor qubits in silicon
Superexchange coupling of donor qubits in silicon Open
Atomic engineering in a solid-state material has the potential to functionalize the host with novel phenomena. STM-based lithographic techniques have enabled the placement of individual phosphorus atoms at selective lattice sites of silico…
View article: A solid-state quantum microscope for wavefunction control of an atom-based quantum dot device in silicon
A solid-state quantum microscope for wavefunction control of an atom-based quantum dot device in silicon Open
View article: Hyperfine-mediated spin relaxation in donor-atom qubits in silicon
Hyperfine-mediated spin relaxation in donor-atom qubits in silicon Open
Donor electron spin qubits hosted within nanoscale devices have demonstrated seconds-long relaxation times at magnetic fields suitable for the operation of spin qubits in silicon of B=1.5T. The relaxation rates of these qubits have been sh…
View article: Multi‐Scale Modeling of Tunneling in Nanoscale Atomically Precise Si:P Tunnel Junctions
Multi‐Scale Modeling of Tunneling in Nanoscale Atomically Precise Si:P Tunnel Junctions Open
Controlling electron tunneling is of fundamental importance in the design and operation of semiconductor nanostructures such as field effect transistors (FETs) and quantum computing device architectures. The exponential sensitivity of tunn…
View article: High-Fidelity CNOT Gate for Donor Electron Spin Qubits in Silicon
High-Fidelity CNOT Gate for Donor Electron Spin Qubits in Silicon Open
Epitaxial atom-based spin qubits in silicon exhibit excellent properties, and benefit from the outstanding scalability of that material platform. As silicon spin-based qubits now start to meet the 99% fault-tolerance threshold, the authors…
View article: Single-Shot Readout of Multiple Donor Electron Spins with a Gate-Based Sensor
Single-Shot Readout of Multiple Donor Electron Spins with a Gate-Based Sensor Open
Proposals for large-scale semiconductor spin-based quantum computers require high-fidelity single-shot qubit readout to perform error correction and read out qubit registers at the end of a computation. However, as devices scale to larger …
View article: The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors (Adv. Mater. 6/2023)
The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors (Adv. Mater. 6/2023) Open
Inter-Qubit Coupling Due to their atomic nature, qubits based on electrons bound to phosphorus-doped silicon quantum dots have demonstrated strong inter-qubit coupling. In article number 2201625, Ludwik Kranz, Michelle Y. Simmons, and co-w…
View article: Optimisation of electron spin qubits in electrically driven multi-donor quantum dots
Optimisation of electron spin qubits in electrically driven multi-donor quantum dots Open
View article: The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors
The Use of Exchange Coupled Atom Qubits as Atomic‐Scale Magnetic Field Sensors Open
Phosphorus atoms in silicon offer a rich quantum computing platform where both nuclear and electron spins can be used to store and process quantum information. While individual control of electron and nuclear spins has been demonstrated, t…
View article: Ramped measurement technique for robust high-fidelity spin qubit readout
Ramped measurement technique for robust high-fidelity spin qubit readout Open
State preparation and measurement of single-electron spin qubits typically rely on spin-to-charge conversion where a spin-dependent charge transition of the electron is detected by a coupled charge sensor. For high-fidelity, fast readout, …
View article: Engineering topological states in atom-based semiconductor quantum dots
Engineering topological states in atom-based semiconductor quantum dots Open
View article: Corrigendum: Benchmarking high fidelity single-shot readout of semiconductor qubits (2019 New J. Phys. 21 063011)
Corrigendum: Benchmarking high fidelity single-shot readout of semiconductor qubits (2019 New J. Phys. 21 063011) Open
View article: Spin-Photon Coupling for Atomic Qubit Devices in Silicon
Spin-Photon Coupling for Atomic Qubit Devices in Silicon Open
Electrically addressing spin systems is predicted to be a key component in\ndeveloping scalable semiconductor-based quantum processing architectures, to\nenable fast spin qubit manipulation and long-distance entanglement via\nmicrowave pho…
View article: Optimisation of electrically-driven multi-donor quantum dot qubits
Optimisation of electrically-driven multi-donor quantum dot qubits Open
Multi-donor quantum dots have been at the forefront of recent progress in Si-based quantum computation. Among them, $2P:1P$ qubits have a built-in dipole moment, enabling all-electrical spin operation via hyperfine mediated electron dipole…