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Can finitely many hermitian (positive-semidefinite) operators always be embedded into a sma...

Given $n$ hermitian (positive-semidefinite) operators $Q_1,\cdots,Q_n$ in finite dimensional Hilbert space (the dimension can be very large), is there a mapping $\phi$ maps $Q_i$ to $P_i$, which prese …
Penghui Yao's user avatar