ket.qulib.oracle¶

Quantum oracles.

Functions `ket.qulib.oracle`¶

`phase_oracle`(state[, qubits])	Transform qubits from \(\ket{\texttt{state}}\) to \(-\ket{\texttt{state}}\).
`xor_oracle`(func)	Create an inefficient xor oracle for a given function.

phase_oracle(state: int, qubits: Quant | None = None) → Quant | Callable[[Quant], Quant]¶

Transform qubits from \(\ket{\texttt{state}}\) to \(-\ket{\texttt{state}}\).

This gate is useful for marking states in Grover’s algorithm.

xor_oracle(func)¶

Create an inefficient xor oracle for a given function.

This oracle will compute the xor of the function’s output with the input. The function must take an integer input and return an integer output.

\[\left|x\right>\left|y\right> \mapsto \left|x\right>\left|y \oplus f(x)\right>\]

Example:

def my_function(x: int) -> int:
    return x + 1
oracle = xor_oracle(my_function)
oracle(x, y)

Parameters:: func – Function to create the oracle for.
Returns:: Oracle that computes the xor of the function’s output with the input.