The spin-zero manifold of exchange-coupled spins offers Catalan-number dimension near 2^N and can be benchmarked with adapted XEB, mirror RB, and OTOCs under coarse PSB readout.
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Explicit conditions are given under which dimer states are guaranteed ground states in generalized Majumdar-Ghosh spin chains and ladders with arbitrary-range and anisotropic interactions, validated by exact diagonalization.
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Spin singlets are useful
The spin-zero manifold of exchange-coupled spins offers Catalan-number dimension near 2^N and can be benchmarked with adapted XEB, mirror RB, and OTOCs under coarse PSB readout.
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Exact dimer ground states of long-range spin chains and ladders
Explicit conditions are given under which dimer states are guaranteed ground states in generalized Majumdar-Ghosh spin chains and ladders with arbitrary-range and anisotropic interactions, validated by exact diagonalization.