qiskit.aqua.operators.evolutions.QDrift¶

class QDrift(reps=1)[source]¶

The QDrift Trotterization method, which selects each each term in the Trotterization randomly, with a probability proportional to its weight. Based on the work of Earl Campbell in https://arxiv.org/abs/1811.08017.

Parameters: reps (int) – The number of times to repeat the Trotterization circuit.

__init__(reps=1)[source]¶

Parameters: reps (int) – The number of times to repeat the Trotterization circuit.

Methods

__init__([reps])

type reps: int

convert(operator)

Convert a SummedOp into a ComposedOp or CircuitOp representing an approximation of e^-i*``op_sum``.

Attributes

reps

The number of repetitions to use in the Trotterization, improving the approximation accuracy.

convert(operator)[source]¶

Convert a SummedOp into a ComposedOp or CircuitOp representing an approximation of e^-i*``op_sum``.

Parameters: operator (OperatorBase) – The SummedOp to evolve.
Return type: OperatorBase
Returns: The Operator approximating op_sum’s evolution.
Raises: TypeError – A non-SummedOps Operator is passed into convert.

property reps¶

The number of repetitions to use in the Trotterization, improving the approximation accuracy.

Return type: int