C贸digo fuente para qiskit.circuit.library.boolean_logic.inner_product

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# (C) Copyright IBM 2020.
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"""InnerProduct circuit."""


from qiskit.circuit import QuantumRegister, QuantumCircuit


[documentos]class InnerProduct(QuantumCircuit): r"""A 2n-qubit Boolean function that computes the inner product of two n-qubit vectors over :math:`F_2`. This implementation is a phase oracle which computes the following transform. .. math:: \mathcal{IP}_{2n} : F_2^{2n} \rightarrow {-1, 1} \mathcal{IP}_{2n}(x_1, \cdots, x_n, y_1, \cdots, y_n) = (-1)^{x.y} The corresponding unitary is a diagonal, which induces a -1 phase on any inputs where the inner product of the top and bottom registers is 1. Otherwise it keeps the input intact. .. parsed-literal:: q0_0: 鈹鈻犫攢鈹鈹鈹鈹鈹鈹鈹鈹鈹 q0_1: 鈹鈹尖攢鈹鈻犫攢鈹鈹鈹鈹鈹鈹 鈹 鈹 q0_2: 鈹鈹尖攢鈹鈹尖攢鈹鈻犫攢鈹鈹鈹 鈹 鈹 鈹 q0_3: 鈹鈹尖攢鈹鈹尖攢鈹鈹尖攢鈹鈻犫攢 鈹 鈹 鈹 鈹 q1_0: 鈹鈻犫攢鈹鈹尖攢鈹鈹尖攢鈹鈹尖攢 鈹 鈹 鈹 q1_1: 鈹鈹鈹鈹鈻犫攢鈹鈹尖攢鈹鈹尖攢 鈹 鈹 q1_2: 鈹鈹鈹鈹鈹鈹鈹鈻犫攢鈹鈹尖攢 q1_3: 鈹鈹鈹鈹鈹鈹鈹鈹鈹鈹鈻犫攢 Reference Circuit: .. plot:: from qiskit.circuit.library import InnerProduct from qiskit.tools.jupyter.library import _generate_circuit_library_visualization circuit = InnerProduct(4) _generate_circuit_library_visualization(circuit) """ def __init__(self, num_qubits: int) -> None: """Return a circuit to compute the inner product of 2 n-qubit registers. Args: num_qubits: width of top and bottom registers (half total circuit width) """ qr_a = QuantumRegister(num_qubits) qr_b = QuantumRegister(num_qubits) inner = QuantumCircuit(qr_a, qr_b, name="inner_product") for i in range(num_qubits): inner.cz(qr_a[i], qr_b[i]) super().__init__(*inner.qregs, name="inner_product") self.compose(inner.to_gate(), qubits=self.qubits, inplace=True)