Quantum Information
qiskit.quantum_info
Operators
Operator(data[, input_dims, output_dims]) | Matrix operator class |
Pauli([data, x, z, label]) | N-qubit Pauli operator. |
Clifford(data[, validate, copy]) | An N-qubit unitary operator from the Clifford group. |
ScalarOp([dims, coeff]) | Scalar identity operator class. |
SparsePauliOp(data[, coeffs, ...]) | Sparse N-qubit operator in a Pauli basis representation. |
CNOTDihedral([data, num_qubits, validate]) | An N-qubit operator from the CNOT-Dihedral group. |
PauliList(data) | List of N-qubit Pauli operators. |
PauliTable(data) | DEPRECATED: Symplectic representation of a list Pauli matrices. |
StabilizerTable(data[, phase]) | DEPRECATED: Symplectic representation of a list Stabilizer matrices. |
pauli_basis(num_qubits[, weight, pauli_list]) | Return the ordered PauliTable or PauliList for the n-qubit Pauli basis. |
States
Statevector(data[, dims]) | Statevector class |
DensityMatrix(data[, dims]) | DensityMatrix class |
StabilizerState(data[, validate]) | StabilizerState class. |
Channels
Choi(data[, input_dims, output_dims]) | Choi-matrix representation of a Quantum Channel. |
SuperOp(data[, input_dims, output_dims]) | Superoperator representation of a quantum channel. |
Kraus(data[, input_dims, output_dims]) | Kraus representation of a quantum channel. |
Stinespring(data[, input_dims, output_dims]) | Stinespring representation of a quantum channel. |
Chi(data[, input_dims, output_dims]) | Pauli basis Chi-matrix representation of a quantum channel. |
PTM(data[, input_dims, output_dims]) | Pauli Transfer Matrix (PTM) representation of a Quantum Channel. |
Measures
average_gate_fidelity(channel[, target, ...]) | Return the average gate fidelity of a noisy quantum channel. |
process_fidelity(channel[, target, ...]) | Return the process fidelity of a noisy quantum channel. |
gate_error(channel[, target, require_cp, ...]) | Return the gate error of a noisy quantum channel. |
diamond_norm(choi, **kwargs) | Return the diamond norm of the input quantum channel object. |
state_fidelity(state1, state2[, validate]) | Return the state fidelity between two quantum states. |
purity(state[, validate]) | Calculate the purity of a quantum state. |
concurrence(state) | Calculate the concurrence of a quantum state. |
entropy(state[, base]) | Calculate the von-Neumann entropy of a quantum state. |
entanglement_of_formation(state) | Calculate the entanglement of formation of quantum state. |
mutual_information(state[, base]) | Calculate the mutual information of a bipartite state. |
Utility Functions
partial_trace(state, qargs) | Return reduced density matrix by tracing out part of quantum state. |
shannon_entropy(pvec[, base]) | Compute the Shannon entropy of a probability vector. |
commutator(a, b) | Compute commutator of a and b. |
anti_commutator(a, b) | Compute anti-commutator of a and b. |
double_commutator(a, b, c, *[, commutator]) | Compute symmetric double commutator of a, b and c. |
Random
random_statevector(dims[, seed]) | Generator a random Statevector. |
random_density_matrix(dims[, rank, method, seed]) | Generator a random DensityMatrix. |
random_unitary(dims[, seed]) | Return a random unitary Operator. |
random_hermitian(dims[, traceless, seed]) | Return a random hermitian Operator. |
random_pauli(num_qubits[, group_phase, seed]) | Return a random Pauli. |
random_clifford(num_qubits[, seed]) | Return a random Clifford operator. |
random_quantum_channel([input_dims, ...]) | Return a random CPTP quantum channel. |
random_cnotdihedral(num_qubits[, seed]) | Return a random CNOTDihedral element. |
random_pauli_table(num_qubits[, size, seed]) | Return a random PauliTable. |
random_pauli_list(num_qubits[, size, seed, ...]) | Return a random PauliList. |
random_stabilizer_table(num_qubits[, size, seed]) | DEPRECATED: Return a random StabilizerTable. |
Analysis
hellinger_distance(dist_p, dist_q) | Computes the Hellinger distance between two counts distributions. |
hellinger_fidelity(dist_p, dist_q) | Computes the Hellinger fidelity between two counts distributions. |
Z2Symmetries(symmetries, sq_paulis, sq_list) | The $Z_2$ symmetry converter identifies symmetries from the problem hamiltonian and uses them to provide a tapered - more efficient - representation of operators as Paulis for this problem. |
Synthesis
OneQubitEulerDecomposer([basis, use_dag]) | A class for decomposing 1-qubit unitaries into Euler angle rotations. |
TwoQubitBasisDecomposer(gate[, ...]) | A class for decomposing 2-qubit unitaries into minimal number of uses of a 2-qubit basis gate. |
two_qubit_cnot_decompose | |
Quaternion(data) | A class representing a Quaternion. |
decompose_clifford(clifford[, method]) | DEPRECATED: Decompose a Clifford operator into a QuantumCircuit. |
XXDecomposer([basis_fidelity, euler_basis, ...]) | A class for optimal decomposition of 2-qubit unitaries into 2-qubit basis gates of XX type (i.e., each locally equivalent to CAN(alpha, 0, 0) for a possibly varying alpha). |
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