General conditions on site-dependent interaction ranges in Z(N) quantum chains ensure free-particle eigenspectra, with dynamical critical exponents computed for constant even/odd-site ranges.
Free- Fermion subsystem codes
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A perturbation of two Ising chains (or interpolation between Jordan-Wigner and Fendley FFD models) yields an FFD-solvable spin chain without exponential degeneracies for generic couplings.
The succinct state 2-local Hamiltonian problem for qubit Hamiltonians is promise-MA-complete.
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Free fermionic and parafermionic multispin quantum chains with non-homogeneous interacting ranges
General conditions on site-dependent interaction ranges in Z(N) quantum chains ensure free-particle eigenspectra, with dynamical critical exponents computed for constant even/odd-site ranges.
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Free fermions in disguise without exponential degeneracies
A perturbation of two Ising chains (or interpolation between Jordan-Wigner and Fendley FFD models) yields an FFD-solvable spin chain without exponential degeneracies for generic couplings.
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On the Complexity of the Succinct State Local Hamiltonian Problem
The succinct state 2-local Hamiltonian problem for qubit Hamiltonians is promise-MA-complete.