A special simplex in the state space for entangled qudits

Autor(en)

Bernhard Baumgartner, Heide Narnhofer, Beatrix Hiesmayr

Abstrakt

The focus is on two parties with Hilbert spaces of dimension d, i.e. 'qudits'. In the state space of these two possibly entangled qudits an analogue to the well-known tetrahedron with the four qubit Bell states at the vertices is presented. The simplex analogue to this magic tetrahedron includes mixed states. Each of these states appears to each of the two parties as the maximally mixed state. Some studies on these states are performed, and special elements of this set are identified. A large number of them are included in the chosen simplex which fits exactly into conditions needed for teleportation and other applications. Its rich symmetry—related to that of a classical phase space—helps to study entanglement, to construct witnesses and perform partial transpositions. This simplex has been explored in detail for d = 3. In this paper, the mathematical background and extensions to arbitrary dimensions are analysed.

Organisation(en)

Mathematische Physik, Teilchenphysik

Journal

Journal of Physics A: Mathematical and Theoretical

Band

40

Seiten

7919-7938

Anzahl der Seiten

20

ISSN

1751-8113

DOI

https://doi.org/10.1088/1751-8113/40/28/S03

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

103019 Mathematische Physik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b037b3c5-a781-4897-bce7-94da95f2781f