A quantum instrument is a quantum operation with both classical and quantum outputs. It combines the concepts of measurement and quantum operation.
Usually it is implemented as a weighted collection of completely positive maps the sum of which is trace preserving.
Quantum Instrument: collection acts as:
A quantum instrument is more general than a quantum operation because it records the outcome k of which operator acted on the state.
||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (July 2009)|
- E. Davies, J. Lewis. An operational approach to quantum probability, Comm. Math. Phys., vol. 17, pp. 239-260, 1970.
- Distillation of secret key paper
- Another paper which uses the concept