QubitWire 100

DiVincenzo connects two questions that every hardware program must answer: what must a quantum computer be able to do, and which physical system can do it? His implementation criteria provide a vocabulary for assessing qubit preparation, control, coherence and measurement. With Daniel Loss he proposed a concrete semiconductor-spin architecture. Together, these contributions link general requirements to an enduring experimental direction. The profile credits the shared proposal jointly and separates that scientific legacy from institutional responsibilities that have since changed.

Dzurak’s contribution centers on making silicon a controllable quantum-computing medium and pursuing its commercial development. He coauthored an experimental two-qubit gate using electron spins in silicon quantum dots, an important step beyond isolated single-qubit operation. As Diraq’s founder and chief executive, he also directs a company pursuing silicon-based processors. The significance lies in this connection between a demonstrated building block and an engineering program; large-scale performance remains something to demonstrate.

Documented work base: Australia

Lodahl works on the point where matter can prepare, control and connect individual photons. His collaborations use quantum emitters in nanophotonic structures to generate entanglement and enable optical interactions that photons would not ordinarily provide by themselves. Recent experiments demonstrate temporal fusion of entangled resource states and programmable nonlinear circuits. These are concrete components for photonic computing and networking, rather than claims that a complete large-scale photonic computer has already been assembled.

Documented work base: Denmark

Loss helped turn the spin of a confined electron into a detailed proposal for a quantum-computing building block. The shared Loss–DiVincenzo architecture specifies how spins could store information and interact to perform gates, while later work examines the obstacles between that proposal and an operating machine. His Basel research and participation in NCCR SPIN connect the theoretical program to a broader semiconductor-qubit effort. Inclusion recognizes an architectural contribution and sustained research activity, without assigning him every subsequent experimental result in the field.

Documented work base: Switzerland

Marcus’s experimental work connects quantum-information goals with the behavior of electronic materials. A collaborative double-quantum-dot experiment demonstrated preparation, manipulation and readout of two-electron spin states, including techniques to suppress dephasing. Later work on epitaxial semiconductor–superconductor nanowires improved control of the material interface, an essential issue for hybrid devices. These contributions illustrate two routes through solid-state quantum hardware. His current professional identification follows the University of Washington faculty page, which records his move there in 2023.

Documented work base: United States

Morello’s contribution centers on making a single atom in silicon behave as a controllable information system. His group’s electron-spin work established practical readout and control, followed by nuclear-spin demonstrations that exploited a different part of the same atom. This gives silicon quantum computing both processing and memory possibilities. The research is significant because a qubit needs preparation, operations and measurement together; long coherence alone is insufficient. The cited results remain specific experimental demonstrations rather than evidence of a completed large-scale processor.

Documented work base: Australia

Morton spans fundamental control of spins in silicon and the practical demands of producing a quantum computer. His coauthored nuclear-spin experiment demonstrates the first side of that connection, while founding Quantum Motion addresses architecture and industrial fabrication. The company’s current team page identifies him as founder and CTO. Phasecraft also identifies him as a director and co-founder, so those affiliations are complementary rather than mutually exclusive. This profile emphasizes documented research and founding contributions without assigning company-wide inventions to him alone.

Documented work base: United Kingdom

Simmons pursues a route to quantum computing in which the placement of individual atoms is part of the device design. Her research record connects atomic-scale fabrication to electronic components and operations on silicon qubits. She also founded Silicon Quantum Computing to develop that approach commercially. Her inclusion rests on the connection between a distinctive manufacturing method and demonstrated device physics, with academic research and company development clearly identified as related but different activities.

Documented work base: Australia

Simmons works at the interface between storing quantum information and transmitting it. Her research on silicon spin–photon systems underpins Photonic’s approach to connecting qubits optically, and she leads the company’s technical vision as Chief Quantum Officer. That combination of local quantum memory and remote connection is central to a distributed architecture. Her profile therefore focuses on the physical interface and the organization she helped create, without treating prospective scale or fault tolerance as demonstrated achievements.

Documented work base: Canada

Vandersypen’s career connects an early experimental test of a quantum algorithm with the continuing challenge of building controllable solid-state qubits. The nuclear-spin experiment demonstrated a small instance of factoring, while his Delft program develops ways to trap, initialize, manipulate and read individual electron spins. These contributions address different stages of the field. Together they show how algorithm demonstrations and detailed device control can inform the search for physical systems that support larger quantum computations.

Documented work base: Netherlands