class cirq.SupportsTraceDistanceBound(*args, **kwargs)[source]

An effect with known bounds on how easy it is to detect.

Used when deciding whether or not an operation is negligible. For example,
the trace distance between the states before and after a Z**0.00000001
operation is very close to 0, so it would typically be considered
__init__(*args, **kwargs)



A maximum on the trace distance between val’s input and output.