Draft:Randomized compiling (quantum computing)

Randomized compiling is a technique to convert coherent errors into incoherent errors, especially useful for NISQ devices.

Coherent errors map pure states to pure states and thus do not result in decoherence. Destroying coherence between Pauli components of the noise channel transforms it into the Pauli channel, meaning all off-diagonal elements of the Pauli transfer matrix vanish. As a result, the remaining errors are uncorrelated Pauli errors, which is the assumption of many techniques.