Merge branch 'dev' of https://github.com/ColibrITD-SAS/mpqp into dev

Author: Henri-ColibrITD

docs/measures.rst

@@ -43,3 +43,7 @@ Measuring using an observable
 
 .. automodule:: mpqp.core.instruction.measurement.expectation_value
 
+Pauli String
+^^^^^^^^^^^^
+
+.. automodule:: mpqp.core.instruction.measurement.pauli_string

mpqp/core/instruction/measurement/pauli_string.py

@@ -27,7 +27,7 @@ class PauliString:
         monomials : List of Pauli monomials.
 
     Example:
-        >>> I@Z + 2*Y@I + X@Z
+        >>> I @ Z + 2 * Y @ I + X @ Z
         1*I@Z + 2*Y@I + 1*X@Z
     """
 
@@ -142,7 +142,7 @@ def simplify(self) -> PauliString:
         """Simplify the PauliString by combining like terms and removing terms with zero coefficients.
 
         Example:
-            >>> ps = I@I - 2* I@I + Z@I - Z@I
+            >>> ps = I @ I - 2 * I @ I + Z @ I - Z @ I
             >>> simplified_ps = ps.simplify()
             >>> print(simplified_ps)
             -1*I@I
@@ -471,27 +471,24 @@ def __hash__(self):
 _allow_atom_creation = True
 
 I = PauliStringAtom("I", np.eye(2, dtype=np.complex64))
-"""Pauli-I atom representing the identity operator in a Pauli monomial or string.
+r"""Pauli-I atom representing the identity operator in a Pauli monomial or string.
 Matrix representation:
-[1 0]
-[0 1]
+`\begin{pmatrix}1&0\\0&1\end{pmatrix}`
 """
 X = PauliStringAtom("X", 1 - np.eye(2, dtype=np.complex64))
-"""Pauli-X atom representing the X operator in a Pauli monomial or string.
+r"""Pauli-X atom representing the X operator in a Pauli monomial or string.
 Matrix representation:
-[0 1]
-[1 0]
+`\begin{pmatrix}0&1\\1&0\end{pmatrix}`
+
 """
 Y = PauliStringAtom("Y", np.fliplr(np.diag([1j, -1j])))
-"""Pauli-Y atom representing the Y operator in a Pauli monomial or string.
+r"""Pauli-Y atom representing the Y operator in a Pauli monomial or string.
 Matrix representation:
-[0 -i]
-[i  0]
+`\begin{pmatrix}0&-i\\i&0\end{pmatrix}`
 """
 Z = PauliStringAtom("Z", np.diag([1, -1]))
-"""Pauli-Z atom representing the Z operator in a Pauli monomial or string.
+r"""Pauli-Z atom representing the Z operator in a Pauli monomial or string.
 Matrix representation:
-[1  0]
-[0 -1]
+`\begin{pmatrix}1&0\\0&-1\end{pmatrix}`
 """
 _allow_atom_creation = False