tensorcircuit.templates.conversions#

helper functions for conversions

tensorcircuit.templates.conversions.QUBO_to_Ising(Q: Any) → Tuple[Any, List[float], float][source]#

Cnvert the Q matrix into a the indication of pauli terms, the corresponding weights, and the offset. The outputs are used to construct an Ising Hamiltonian for QAOA.

Parameters: Q – The n-by-n square and symmetric Q-matrix.
Return pauli_terms: A list of 0/1 series, where each element represents a Pauli term.

A value of 1 indicates the presence of a Pauli-Z operator, while a value of 0 indicates its absence. :return weights: A list of weights corresponding to each Pauli term. :return offset: A float representing the offset term of the Ising Hamiltonian.

tensorcircuit.templates.conversions.get_ps(qo: Any, n: int) → Tuple[Any, Any][source]#

Get Pauli string array and weights array for a qubit Hamiltonian as a sum of Pauli strings defined in openfermion QubitOperator.

Parameters

qo (openfermion.ops.operators.qubit_operator.QubitOperator) – openfermion.ops.operators.qubit_operator.QubitOperator
n (int) – The number of qubits

Returns

Pauli String array and weights array

Return type

Tuple[Tensor, Tensor]