Stochastic errors in quantum instruments

Understand

Fault-tolerant quantum computation requires non-destructive quantum measurements with classical feed-forward.

• Many experimental groups are actively working towards implementing such capabilities and so they need to be accurately evaluated.
• As with unitary channels, an arbitrary imperfect implementation of a quantum instrument is difficult to analyze.
• In this paper, we define a class of quantum instruments that correspond to stochastic errors and thus are amenable to standard analysis methods.