Reduce measurement cost using qubit-wise commutativity

doc/source/api-reference/measurement.rst

@@ -2,10 +2,24 @@
 Measurement
 ===========
 
-This section covers the API reference for obtaining the expectation value of a (molecular) Hamiltonian
+This section covers the API reference for obtaining the expectation value of a (molecular) Hamiltonian, either from a
+state vector simulation, or from sample measurements.
+
+Expectation value of Hamiltonian
+--------------------------------
+
+.. autofunction:: qibochem.measurement.result.expectation
+
+.. _expectation-samples:
+
+.. autofunction:: qibochem.measurement.result.expectation_from_samples
+
+Measurement cost reduction
+--------------------------
+
+The following functions are used for reducing and optimising the measurement cost of obtaining the Hamiltonian
+expectation value when sample measurements are used.
 
 .. autofunction:: qibochem.measurement.optimization.measurement_basis_rotations
 
 .. autofunction:: qibochem.measurement.optimization.allocate_shots
-
-.. autofunction:: qibochem.measurement.expectation

doc/source/tutorials/ansatz.rst

@@ -232,4 +232,4 @@ The orthonormal molecular orbitals :math:`\phi` are optimized by a direct minimi
 
 .. [#f6] Piela, L. (2007). 'Ideas of Quantum Chemistry'. Elsevier B. V., the Netherlands.
 
-.. [#f7] Clements W. R. et al., 'Optimal Design for Universal Multiport Interferometers', Optica 3 (2016) 1460.
+.. [#f7] Clements, W. R. et al., 'Optimal Design for Universal Multiport Interferometers', Optica 3 (2016) 1460.