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An effect with known bounds on how easy it is to detect.
cirq.protocols.SupportsTraceDistanceBound( *args, **kwargs )
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 negligible.
_trace_distance_bound_() -> float
A maximum on the trace distance between
val's input and output.
Generally this method is used when deciding whether to keep gates, so only the behavior near 0 is important. Approximations that overestimate the maximum trace distance are permitted. If, for any case, the bound exceeds 1, this function will return 1. Underestimates are not permitted.