I'm just wondering if there is an algorithm to do reverse mapping of a Hamiltonian on qubit basis to fermionic operator in Fock space, assuming we know the mapping rule (e.g. Jordan-Wigner).
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1$\begingroup$ Jordan–Wigner transformation as far as I know was originally created to do the opposite, map spins into fermions. Most books on second quantization go this path. $\endgroup$– MauricioCommented Jul 27, 2022 at 23:55
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1$\begingroup$ I think I solved my own problem. Openfermion has a function called reverse_jordan_wigner that has that function $\endgroup$– user21384Commented Jul 28, 2022 at 16:13
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1$\begingroup$ you can submit an answer to your own question but you should edit the question to specify that you were looking for a solution in Qiskit $\endgroup$– MauricioCommented Jul 28, 2022 at 16:56
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