Research Board
Quantum computing, connected.
Explore the field or jump to a company. Follow the connections to the research.
Browse the connections as a list
Quantum computing
Start with a branch. Follow it to the technologies, companies, and ideas covered in the notebook.
Hardware & approaches
Different ways to build and use a quantum machine. Follow an approach to its company stories and research.
The building blocks
The concepts underneath the hardware claims: information, operations, and measurement.
Error correction
Connect fragile physical qubits to protected logical ones, and follow the overhead that protection introduces.
Applications & networks
Follow the problems studied in the notebook and the links between an application, its algorithm, and the hardware.
Evidence & benchmarks
What was measured, what was assumed, and what could actually be checked? These connections help read a performance claim.
Trapped ions
Follow the trapped-ion company stories into connectivity, error correction, and the cost of keeping a calculation alive.
Superconducting
Read the superconducting research through calibration, protected qubits, and tests of useful quantum output.
Photonics
Explore the notebook’s light-based company stories and how their engineering and business questions differ.
Neutral atoms
Follow the neutral-atom coverage through simulations, noise models, and what happens when a model meets another device.
Topological qubits
Explore the proposed protection, the measurements used to support the claim, and the debate over their interpretation.
Quantum annealing
Read D-Wave’s company story alongside the notebook’s examination of simulation claims and the classical response.
Qubits
Start with the unit of quantum information, then distinguish the physical hardware from the protected logical unit.
Superposition
Follow the quantum state from its possibilities to the consequences of measurement.
Entanglement
Connect correlations between qubits to the questions raised by networked quantum systems.
Gates & circuits
See how quantum operations are assembled into a calculation, and where their imperfections enter.
Measurement
Understand what is read from a quantum system and how that differs from the quantity an experiment is trying to estimate.
Logical qubits
Follow the trade between spreading information across physical qubits and the cost of checking them.
Fault tolerance
Ask whether errors stay contained during the operations of a calculation, as well as while information is stored.
Noise & coherence
Look beyond how often a machine errs to the kind of error, its timing, and whether the noise model captures it.
Connectivity
Which qubits can interact, and what does the calculation pay when the required connection is missing?
Quantum chemistry
Trace molecular-energy calculations from the algorithm to the hardware, the classical scaffolding, and the accuracy of the result.
Quantum simulation
Follow many-body experiments and the question of what classical methods can still reproduce or check.
Quantum networking
Follow entanglement between separated qubits and the distance between a network demonstration and a scalable system.
Gate fidelity
Read a fidelity figure with its measurement protocol, scope, and operating conditions.
Qubit count
Learn why the raw number of qubits needs context before it becomes evidence of a more capable machine.
Classical checks
Inspect what can be compared with a classical reference, and how uncertainty is handled when that reference runs out.
IonQ
A narrative-and-numbers company analysis of IonQ, told as a notebook.
The company story
What to watch
Look for larger codes with lower logical error, fewer discarded runs, and the time cost of correction reported alongside the result.
Related paper reviews
Includes comparisons and mentions within a wider analysis.
Quantinuum
A narrative-and-numbers company analysis of Quantinuum, told as a notebook.
The company story
What to watch
Look for larger codes with lower logical error, fewer discarded runs, and the time cost of correction reported alongside the result.
Related paper reviews
Includes comparisons and mentions within a wider analysis.
IBM
Follow IBM through the paper reviews and technology covered in this notebook.
What to watch
Look for uncertainty bounds in the hard regime, independently tested noise assumptions, and useful output after the cost of verification is counted.
Related paper reviews
Includes comparisons and mentions within a wider analysis.
Google Quantum AI
Follow Google Quantum AI through the paper reviews and technology covered in this notebook.
What to watch
Look for larger codes with lower logical error, fewer discarded runs, and the time cost of correction reported alongside the result.
Related paper reviews
Includes comparisons and mentions within a wider analysis.
Microsoft
A narrative-and-numbers company analysis of Microsoft's quantum bet, told as a notebook.
The company story
What to watch
Look for evidence that distinguishes topological behavior from alternative explanations, and working gates with fidelity measurements that test the promised protection.
Related paper reviews
Includes comparisons and mentions within a wider analysis.
Rigetti
A narrative-and-numbers company analysis of Rigetti Computing (RGTI), told as a notebook.
The company story
D-Wave
A narrative-and-numbers company analysis of D-Wave, told as a notebook.
The company story
Related paper reviews
Includes comparisons and mentions within a wider analysis.
Xanadu
A narrative-and-numbers company analysis of Xanadu (XNDU), told as a notebook.
The company story
Quantum Computing Inc.
A narrative-and-numbers company analysis of Quantum Computing Inc (QUBT), told as a notebook.
The company story
Pasqal
Follow Pasqal through the paper reviews and technology covered in this notebook.
Related paper reviews
Includes comparisons and mentions within a wider analysis.
Connections reflect the notebook’s published coverage. Company stories and paper reviews retain their original dates.