qat.quops.metrics.get_diamond_norm

qat.quops.metrics.get_diamond_norm(qchan, eps=1e-06, verbose=False)

Compute the diamond norm (aka completely bounded trace norm) of a quantum channel.

Parameters

• qchan (QuantumChannel[Kraus|PTM|Choi]) – a quantum channel

• eps (float, optional) – accuracy on norm computation (if not CP). Defaults to 1e-6.

• verbose (bool, optional) – for verbose output. Defaults to False

Returns

diamond norm

Return type

float