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 \(4^n\) disjoint possibilities: nothing (the
identity channel) or one of the \(4^n - 1\) pauli gates. The disjoint
probabilities of the non-identity Pauli gates are all the same,
\(p / (4^n - 1)\), 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
\[
\rho \rightarrow (1 - p) \rho + p / (4^n - 1) \sum _i P_i \rho P_i
\]
where \(P_i\) are the \(4^n - 1\) 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
\(p / (4^n - 1)\).
|
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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