qml.var¶
-
var
(op)[source]¶ Variance of the supplied observable.
Example:
dev = qml.device("default.qubit", wires=2) @qml.qnode(dev) def circuit(x): qml.RX(x, wires=0) qml.Hadamard(wires=1) qml.CNOT(wires=[0, 1]) return qml.var(qml.PauliY(0))
Executing this QNode:
>>> circuit(0.5) 0.7701511529340698
- Parameters
op (Observable) – a quantum observable object
- Raises
QuantumFunctionError – op is not an instance of
Observable
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