Bell-state phase of entangled photons partitions biexciton excitations between bright and exchange-dark eigenstates in WSe2 via independent valley pathways, with >0.97 visibility at 4 K.
Any such state has positive partial transpose (PPT) [48, 49]
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Eigenstate-Selective Entangled Two-Photon Absorption in Monolayer WSe$_2$
Bell-state phase of entangled photons partitions biexciton excitations between bright and exchange-dark eigenstates in WSe2 via independent valley pathways, with >0.97 visibility at 4 K.