add alias for pauli operators

shuaigroup / Renormalizer

Quantum dynamics package based on tensor network states

https://shuaigroup.github.io/Renormalizer/

Apache License 2.0

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Closed liwt31 closed 2 years ago

liwt31 commented 2 years ago

Add "X", "Y", "Z", etc. as alias for Pauli operators, in addition to "sigma_x", etc.
internally change "b^\dagger + b" to "b^\dagger+b" for consistency. "b^\dagger + b" can still be used in external interfaces but should be deprecated in the future.
Disable the underflow warning since it usually does not matter.