- class CNOTDihedral(data=None, num_qubits=None, validate=True)¶
An N-qubit operator from the CNOT-Dihedral group.
An \(N\)-qubit CNOT-Dihedral operator is stored as an affine function and a phase polynomial, based on the convention in references [1, 2].
The affine function consists of an \(N \times N\) invertible binary matrix, and an \(N\) binary vector.
The phase polynomial is a polynomial of degree at most 3, in \(N\) variables, whose coefficients are in the ring Z_8 with 8 elements.
from qiskit import QuantumCircuit from qiskit.quantum_info import CNOTDihedral circ = QuantumCircuit(3) circ.cx(0, 1) circ.x(2) circ.t(1) circ.t(1) circ.t(1) elem = CNOTDihedral(circ) # Print the CNOTDihedral element print(elem)
phase polynomial = 0 + 3*x_0 + 3*x_1 + 2*x_0*x_1 affine function = (x_0,x_0 + x_1,x_2 + 1)
CNOTDihedral operators can be initialized from circuits containing only the following gates:
SwapGate. They can be converted back into a
Gateobject using the
to_instruction()methods respectively. Note that this decomposition is not necessarily optimal in terms of number of gates if the number of qubits is more than two.
Shelly Garion and Andrew W. Cross, Synthesis of CNOT-Dihedral circuits with optimal number of two qubit gates, Quantum 4(369), 2020
Andrew W. Cross, Easwar Magesan, Lev S. Bishop, John A. Smolin and Jay M. Gambetta, Scalable randomised benchmarking of non-Clifford gates, npj Quantum Inf 2, 16012 (2016).
Initialize a CNOTDihedral operator object.
QiskitError – if the type is invalid.
QiskitError – if validate=True and the CNOTDihedral element is invalid.
Return the adjoint of the Operator.
Return the operator composition with another CNOTDihedral.
Return the conjugate of the CNOTDihedral.
Make a deep copy of current operator.
Return the right multiplied operator self * other.
Return the reverse-order tensor product with another CNOTDihedral.
Return tuple of input dimension for specified subsystems.
Return tuple of output dimension for specified subsystems.
Return the compose of a operator with itself n times.
Return a shallow copy with reshaped input and output subsystem dimensions.
Return the tensor product with another CNOTDihedral.
Return a QuantumCircuit implementing the CNOT-Dihedral element.
Return a Gate instruction implementing the CNOTDihedral object.
Convert operator to Numpy matrix.
Convert to an Operator object.
Return the transpose of the CNOTDihedral.
Return tuple (input_shape, output_shape).
Return the number of qubits if a N-qubit operator or None otherwise.
Return the qargs for the operator.