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.

`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`(tape, wires0, wires1[, base])	Compute the mutual information from a `QuantumTape` returning a `state()`:
`purity`(tape, wires, **kwargs)	Compute the purity of a `QuantumTape` returning `state()`.
`qnode_execution_wrapper`(self, qnode, targs, …)	Here, we overwrite the QNode execution wrapper in order to take into account that classical processing may be present inside the QNode.
`reduced_dm`(tape, wires, **kwargs)	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.
`trace_distance`(qnode0, qnode1, wires0, wires1)	Compute the trace distance 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_entanglement_entropy`(tape, wires0, wires1)	Compute the Von Neumann entanglement entropy from a circuit returning a `state()`:
`vn_entropy`(tape, wires[, base])	Compute the Von Neumann entropy from a `QuantumTape` returning a `state()`.

code/qml_qinfo

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