A composite polynomial filter approximates PSD cone projection with matrix multiplications alone, achieving roughly 10x speedup over GPU eigenvalue solvers at about 1e-3 relative error.
Boosting projective methods for quantum process and detector tomography.Physical Review Research, 7:013208, 2025
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Factorization-free Orthogonal Projection onto the Positive Semidefinite Cone with Composite Polynomial Filtering
A composite polynomial filter approximates PSD cone projection with matrix multiplications alone, achieving roughly 10x speedup over GPU eigenvalue solvers at about 1e-3 relative error.