qml.qinfo¶

Overview¶

This module provides a collection of methods to return quantum information quantities from QNode returning state().

QNode transforms for the quantum information quantities.

`classical_fisher`(qnode[, argnums])	Returns a function that computes the classical fisher information matrix (CFIM) of a given `QNode` or quantum tape.
`fidelity`(qnode0, qnode1, wires0, wires1)	Compute the fidelity for two `QNode` returning a `state()` (a state can be a state vector or a density matrix, depending on the device) acting on quantum systems with the same size.
`mutual_info`(qnode, wires0, wires1[, base])	Compute the mutual information from a `QNode` returning a `state()`:
`purity`(qnode, wires)	Compute the purity of a `QNode` returning `state()`.
`quantum_fisher`(qnode, args, *kwargs)	Returns a function that computes the quantum fisher information matrix (QFIM) of a given `QNode`.
`reduced_dm`(qnode, wires)	Compute the reduced density matrix from a `QNode` returning `state()`.
`relative_entropy`(qnode0, qnode1, wires0, wires1)	Compute the relative entropy for two `QNode` returning a `state()` (a state can be a state vector or a density matrix, depending on the device) acting on quantum systems with the same size.
`vn_entropy`(qnode, wires[, base])	Compute the Von Neumann entropy from a `QNode` returning a `state()`.

code/qml_qinfo

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