Entanglement of superpositions in zero-energy subspace: insights from stabilizer theory
The research investigates exact zero-energy eigenstates in spin chains using stabilizer theory and polynomial methods over F2. It establishes that while volume-law entanglement is generally present, specific constructions allow for factorizable zero-energy states with vanishing entanglement across a chain's midpoint. This provides bounds on achievable minimum entanglement without exhaustive numerical search.