View source on GitHub
|
Returns a PhaseFlipChannel that flips a qubit's phase with probability p.
cirq.phase_flip(
p: Optional[float] = None
) -> Union[cirq.ZPowGate, cirq.PhaseFlipChannel]
Used in the notebooks
| Used in the tutorials |
|---|
If p is None, return a guaranteed phase flip in the form of a Z operation.
This channel evolves a density matrix via:
\[ \rho \rightarrow M_0 \rho M_0^\dagger + M_1 \rho M_1^\dagger \]
With:
\[ \begin{aligned} M_0 =& \sqrt{1 - p} \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix} \\ M_1 =& \sqrt{p} \begin{bmatrix} 1 & 0 \\ 0 & -1 \end{bmatrix} \end{aligned} \]
Args | |
|---|---|
p
|
the probability of a phase flip. |
Raises | |
|---|---|
ValueError
|
if p is not a valid probability. |