Quantum computing
Field began in 1982
- Benioff’s work on quantum Turing machines and reversible logic
- Ideas popularized by Feynman, also in 1982
Most approaches are partly digital
- Use quantum bits (qbits), such as
- Spin (up and down)
- The state of a particle (excited, de-excited)
- Any 2-state quantum system can be a qbit
- A spin 1/2 particle
- An ammonia molecule
Spin: An extra (intrinsic, discrete) degree of freedom