44 state aliasing - #5
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Added functionality to create alternative names or "aliases" for energy levels and energy eigenstates in IonSim. This is a quality-of-life update meant to improve readability of basis states and levels in the context of quantum information or other applications. For example, we can alias a level in Yb171+ with name "S1/2, 0, 0" with an alias "0" or "down" or "1" for "S1/2, 1, 0". For the example of a 2-qubit basis, the state "S1/2, 0, 0 ; S1/2, 1, 0" would be aliased to "01". This is a nice feature when dealing with intermediate states or Rydberg states, which can be abbreviated to common symbols like "e" for excited or "r" for Rydberg.
Summary of changes:
Added functionality for the AtomicSpin and MotionalMode constructors to accept a list of aliases by the user.
Atomic internal energy levels and Fock energy levels now have an optional alias attribute.
The user can specify a "join rule" to customize how basis states (in the basis of energy eigenstates) will join aliases from each degree of freedom together. e.g. A user can choose the alias to be "01" or "0,1" or "0;1" for the 2-qubit basis state "S1/2, 0, 0 ; S1/2, 1, 0" in Yb171+.
Added tests to test_basis.py to ensure correct functionality and integration into automated testing.