Equations · equation
Qubit State
Quantum Computing · 1995
- Equation
- |ψ⟩ = α|0⟩ + β|1⟩, |α|² + |β|² = 1
- Field
- Quantum Computing
- Named After
- Benjamin Schumacher (coined 'qubit')
- Symbols
- |0⟩, |1⟩ the two classical answers · α, β complex amplitudes weighting each · measurement yields 0 with probability |α|², 1 with |β|²
- Year
- 1995
Significance
A bit that holds both answers at once, in precise proportions, until measured — the unit of quantum information. n qubits span 2ⁿ amplitudes simultaneously, which is the entire bet behind quantum computing; Schumacher named it while proving quantum states can be compressed, Shannon-style.
Referenced by
element
equation
theory
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