Concept record · edition 0.1.0
Qubit
What the term means here
A controllable two-level quantum system used to represent quantum information.
Why it matters
Qubits are the physical and logical units on which quantum circuits operate.
What this does not establish
A qubit count alone does not measure computational usefulness or error-corrected capacity.
Related claims · 2
- qc-001
A qubit is a quantum information carrier whose state can be prepared, transformed, and measured; it is not simply a classical bit with two labels.
- qc-002
Superconducting circuits, trapped ions, neutral atoms, photonics, and semiconductor spins are distinct hardware approaches with different engineering trade-offs.
Sources used here
authoritative report · verified
Quantum Information Science
NASA · 2025
Authoritative public orientation on quantum information science and its research context.
Source record →authoritative report · verified
Quantum Information Science and Technology Roadmap
U.S. Department of Energy · 2024
Authoritative systems-level account of hardware, algorithms, error correction, and applications.
Source record →