netket.observable.AbstractObservable

class netket.observable.AbstractObservable

Bases: ABC, Generic[HilbertType]

Abstract class for quantum Observables.

An observable is a general object that defines a quantity that can be comptued starting from a variational state. Observables should be computed using the method expect of the variational states, and derivatives of this expectation value can sometimes also be computed using the method expect_and_grad.

All operators are Observables, but some observables are not operators (for example, the entanglement entropy observable does is not an operator).

This class determines the basic methods that an observable must implement to work correctly with NetKet.

Inheritance

Attributes

hilbert

The hilbert space associated to this observable.