Functions:
| Name | Description |
|---|
amplitude_estimation | [Qmod Classiq-library function]. |
amplitude_estimation
amplitude_estimation(
oracle: QCallable[QArray[QBit]],
space_transform: QCallable[QArray[QBit]],
phase: QNum,
packed_vars: QArray[QBit]
) -> None
[Qmod Classiq-library function]
Estimate the probability of a state being marked by the operand oracle as a “good state.”
The algorithm prepares the state in the packed_vars register and estimates the probability of this state being marked by the oracle as a “good state.”
This is done using the Quantum Phase Estimation (QPE) algorithm, where the unitary for QPE is the Grover operator, which is composed of the oracle and space_transform operators.
Parameters:
| Name | Type | Description | Default |
|---|
oracle | QCallable[QArray[QBit]] | The oracle operator that marks the “good” state. This operator should flip the sign of the amplitude of the “good” state. | required |
space_transform | QCallable[QArray[QBit]] | The space transform operator (which is known also the state preparation operator), which is first applied to prepare the state before the QPE, and then used inside the Grover operator. | required |
phase | QNum | Assuming this variable starts from the zero state -this variable output holds the phase=θ result in the [0,1] domain, which relates to the estimated probability a through a=sin2(πθ). | required |
packed_vars | QArray[QBit] | The variable that holds the state to be estimated. Assumed to be in the zero state at the beginning of the algorithm. | required |
