human
Minimal example of defining a custom channel."""
class BitAndPhaseFlipChannel(cirq.SingleQubitGate):
    def __init__(self, p: float) -> None:
        self._p = p
    
    def _mixture_(self):
        ps = [1.0 - self._p, self._p]
        ops = [cirq.unitary(cirq.I), cirq.unitary(cirq.Y)]
        return tuple(zip(ps, ops))
    
    def _has_mixture_(self) -> bool:
        return True
    
    def _circuit_diagram_info_(self, args) -> str:
        return f"BitAndPhaseFlip({self._p})"
Given the above code, generate some markdown instructions for it.
assistant
#Here is code to minimal example of defining a custom channel.

Alternatively, users can define their own channel types. Defining custom channels is similar to defining custom gates.
A minimal example for defining the channel
$$
\rho \mapsto (1 - p) \rho + p Y \rho Y
$$
is shown below.