HardwareEfficientAnsatz

HardwareEfficientAnsatz is a hardware-efficient ansatz tailored to quantum device topologies. Configuration options:

• layers: Number of repeating layers of gates.

• connectivity:

  • circular: Qubits form a ring.

  • linear: Qubits are connected linearly.

  • full: All-to-all connectivity.

  • Or a list of tuples explicitly specifying the connectivity.

• one_qubit_gate: Choose the parameterized single-qubit gate (e.g., U1, U2, U3).

• two_qubit_gate: Choose the two-qubit interaction type (e.g., CNOT, CZ).

• structure:

  • grouped: Applies all single-qubit gates first, followed by all two-qubit gates.

  • interposed: Interleaves single and two-qubit gates.

Example

from qilisdk.digital.ansatz import HardwareEfficientAnsatz
from qilisdk.digital import U3, CNOT


ansatz = HardwareEfficientAnsatz(
    nqubits=4,
    layers=3,
    connectivity="Circular",
    one_qubit_gate=U3,
    two_qubit_gate=CNOT,
    structure="Interposed"
)
ansatz.draw()

This ansatz can then be used as a circuit. For example, we can execute this ansatz using QuTiP backend (need to be installed separately):

from qilisdk.backends import QutipBackend
from qilisdk.functionals import DigitalPropagation
from qilisdk.readout import Readout

backend = QutipBackend()

backend.execute(DigitalPropagation(ansatz), readout=Readout().with_sampling(nshots=1000))