qrao.MagicRounding

class MagicRounding(quantum_instance, *, basis_sampling='uniform', seed=None)

“Magic rounding” method

This method is described in https://arxiv.org/abs/2111.03167v2.

Parameters:

• quantum_instance (QuantumInstance) – Provides the Backend for quantum execution and the shots count (i.e., the number of samples to collect from the magic bases).

• basis_sampling (str) – Method to use for sampling the magic bases. Must be either "uniform" (default) or "weighted". "uniform" samples all magic bases uniformly, and is the method described in https://arxiv.org/abs/2111.03167v2. "weighted" attempts to choose bases strategically using the Pauli expectation values from the minimum eigensolver. However, the approximation bounds given in https://arxiv.org/abs/2111.03167v2 apply only to "uniform" sampling.

• seed (Optional[int]) – Seed for random number generator, which is used to sample the magic bases.

__init__(quantum_instance, *, basis_sampling='uniform', seed=None)

Parameters:

• quantum_instance (QuantumInstance) – Provides the Backend for quantum execution and the shots count (i.e., the number of samples to collect from the magic bases).

• basis_sampling (str) – Method to use for sampling the magic bases. Must be either "uniform" (default) or "weighted". "uniform" samples all magic bases uniformly, and is the method described in https://arxiv.org/abs/2111.03167v2. "weighted" attempts to choose bases strategically using the Pauli expectation values from the minimum eigensolver. However, the approximation bounds given in https://arxiv.org/abs/2111.03167v2 apply only to "uniform" sampling.

• seed (Optional[int]) – Seed for random number generator, which is used to sample the magic bases.

Methods

__init__(quantum_instance, *[, ...])	type quantum_instance: QuantumInstance
round(ctx)	Perform magic rounding

Attributes

basis_sampling	Basis sampling method (either "uniform" or "weighted").
quantum_instance	Provides the Backend and the shots (samples) count.
shots	Shots count as configured by the given quantum_instance.