Quantum 10, 2067 (2026). https://doi.org/10.22331/q-2026-04-15-2067 Approximating the $k$-th spectral gap $Delta_k=|lambda_k-lambda_{k+1}|$ and the corresponding midpoint $mu_k=frac{lambda_k+lambda_{k+1}}{2}$ of an $Ntimes N$ Hermitian matrix with eigenvalues $lambda_1geqlambda_2geqldotsgeqlambda_N$, is an important special case of the eigenproblem with numerous […]

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