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quant-ph2026
Entanglement of superpositions in zero-energy subspace: insights from stabilizer theory
Konstantin Antipin, Richik Sengupta
Exact zero-energy eigenstates built from entangled dimers have recently been found in a large class of spin Hamiltonians. While the individual states have a simple structure, their…
math.NA2026
On the submatrices with the best-bounded inverses
Richik Sengupta, Mikhail Pautov
The following hypothesis was formulated by Goreinov, Tyrtyshnikov, and Zamarashkin in \cite{goreinov1997theory}. If is real matrix with the orthonormal columns $(n>…