10.1k citations · 13.3k across the 91 of their papers we have counts for
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Where are the trapped surfaces?
Jan E. Aman, Ingemar Bengtsson, José M. M. Senovilla
We discuss the boundary of the spacetime region through each point of which a trapped surface passes, first in some simple soluble examples, and then in the self-similar Vaidya sol…
Pentagrams and paradoxes
Piotr Badziag, Ingemar Bengtsson, Adan Cabello +2
Klyachko and coworkers consider an orthogonality graph in the form of a pentagram, and in this way derive a Kochen-Specker inequality for spin 1 systems. In some low-dimensional si…
All Mutually Unbiased Bases in Dimensions Two to Five
Stephen Brierley, Stefan Weigert, Ingemar Bengtsson
All complex Hadamard matrices in dimensions two to five are known. We use this fact to derive all inequivalent sets of mutually unbiased (MU) bases in low dimensions. We find a thr…
`Classical' quantum states
Marek Kuś, Ingemar Bengtsson
We show that several classes of mixed quantum states in finite-dimensional Hilbert spaces which can be characterized as being, in some respect, 'most classical' can be described an…