QubitWire 100

Home’s experimental work explores how a single oscillator can carry a protected logical qubit. His collaborations first prepared and controlled grid states in the motion of a trapped calcium ion, then demonstrated correction of small shifts in position and momentum. This connects a mathematical encoding to the physical operations needed to maintain it. The results are significant steps in quantum control and error correction, with their scope limited to the particular encoded systems and procedures tested.

Documented work base: Switzerland

Kitaev’s work changes how quantum information can be represented and protected. His anyon construction connects fault-tolerant operations to the structure of a two-dimensional quantum system. With Gottesman and Preskill, he also showed how a discrete logical qubit could be embedded in a continuous-variable oscillator and protected against small shifts. These ideas provide architectural building blocks across different hardware programs. They are theoretical constructions whose physical realization requires additional experimental control and error-management work.

Documented work base: United States

Lescanne’s research explores whether hardware can suppress one class of errors before a larger correction code is applied. His collaborative cat-qubit experiment encoded information in a superconducting resonator stabilized by two-photon dissipation. Increasing the separation of its states suppressed bit flips, while phase flips still required attention. Alice & Bob’s history links that work to its 2020 founding. His contribution thus spans an experimentally tested protection mechanism and the attempt to develop it into a computing architecture.

Painter’s contributions join the control of quantum physical systems with the engineering of a computing architecture. His group’s micromechanical experiment generated squeezed light on a silicon device, showing how designed structures can manipulate optical noise. More recently, his AWS hardware program demonstrated the Ocelot cat-qubit chip with error correction. The two results operate at different levels, device physics and encoded computation. Ocelot is an experimental building block toward larger systems, with substantial engineering still required for useful fault-tolerant computing.

Documented work base: United States

Peronnin’s contribution begins with a concrete physical result: a coauthored experiment showed that an oscillator encoding could suppress bit flips exponentially as its encoded states were separated. That bias changes how error correction can be designed, although the remaining errors still require protection. Co-founding Alice & Bob with Raphaël Lescanne brought this approach into a company focused on quantum computing. His inclusion recognizes the connection between experimental research and sustained system development, without treating a proposed scalable architecture as already complete.

Documented work base: France

Preskill’s work links methods for protecting quantum information with a framework for reading the field’s promises. With Daniel Gottesman and Alexei Kitaev, he introduced an oscillator encoding that protects against small displacement errors. His NISQ-era analysis examines opportunities and limitations before comprehensive error correction is available. Together, these contributions explain why physical-qubit counts alone cannot tell a reader whether a machine can perform a reliable calculation. His current Caltech curriculum vitae also lists a Senior Scientist role at Oratomic beginning in 2026, alongside his academic appointments. That concurrent affiliation provides context for reading company forecasts; the underlying research and its assumptions remain the evidence to examine.

Documented work base: United States

Puri’s research asks how a device’s physical noise should shape the design of reliable computation. Her bias-preserving-gate work develops operations that retain an advantageous error structure during a calculation. Her coauthored Kerr-cat work connects that design question with experimental stabilization, gates and readout in superconducting oscillator systems. The Puri Group describes its focus as theoretical quantum information processing and quantum optics, with collaboration across experimental groups. That theory-to-device connection is useful for understanding why adding physical qubits alone is not a complete protection strategy: the code, operations, measurements and assumed noise all have to work together.

Documented work base: United States