99 citations · 100 across the 3 of their papers we have counts for
3 papers
quant-ph2009
Non-existence of bipartite bound entanglement with negative partial transposition
J. Sperling, W. Vogel
Bound entanglement with a nonpositive partial transposition (NPT) does not exist. For any NPT entangled state a distillation procedure can be based on a certain number of copies. T…
quant-ph2009★ 1 cited
Dirac's Quantum Phase Problem
J. Sperling, W. Vogel
In 1927 the great physicist Paul A. M. Dirac failed to provide a consistent quantum description of the phase of a radiation field. Only one year later, he developed the famous Dira…
quant-ph2008★ 99 cited
Necessary and sufficient conditions for bipartite entanglement
J. Sperling, W. Vogel
Necessary and sufficient conditions for bipartite entanglement are derived, which apply to arbitrary Hilbert spaces. Motivated by the concept of witnesses, optimized entanglement i…