169 citations · 1.3k across the 32 of their papers we have counts for
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quant-ph2008★ 47 cited
Representation of entanglement by negative quasi-probabilities
J. Sperling, W. Vogel
Any bipartite quantum state has quasi-probability representations in terms of separable states. For entangled states these quasi-probabilities necessarily exhibit negativities. Bas…
quant-ph2008★ 27 cited
Verifying continuous-variable entanglement in finite spaces
J. Sperling, W. Vogel
Starting from arbitrary Hilbert spaces, we reduce the problem to verify entanglement of any bipartite quantum state to finite dimensional subspaces. Hence, entanglement is a finite…