cirq.depolarize
Returns a DepolarizingChannel with given probability of error.
cirq.depolarize(
p: float, n_qubits: int = 1
) -> cirq.DepolarizingChannel
Used in the notebooks
This channel applies one of 4n disjoint possibilities: nothing (the
identity channel) or one of the 4n−1 pauli gates. The disjoint
probabilities of the non-identity Pauli gates are all the same,
p/(4n−1), and the identity is done with probability 1 - p. The
supplied probability must be a valid probability or else this constructor
will raise a ValueError.
This channel evolves a density matrix via
ρ→(1−p)ρ+p/(4n−1)∑iPiρPi
where Pi are the 4n−1 Pauli gates (excluding the identity).
Args |
p
|
The probability that one of the Pauli gates is applied. Each of
the Pauli gates is applied independently with probability
p/(4n−1).
|
n_qubits
|
The number of qubits.
|
Raises |
ValueError
|
if p is not a valid probability.
|
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Last updated 2024-06-27 UTC.
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