Frontiers of quantum physics

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A simple thermodynamical witness showing universality of macroscopic entanglement

(2009)
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On the quantum criticality in the ground and the thermal states of XX model

(2009)

Authors:

Wonmin Son, Vlatko Vedral
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Information erasure lurking behind measures of complexity

(2009)

Authors:

Karoline Wiesner, Mile Gu, Elisabeth Rieper, Vlatko Vedral
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Entanglement swapping of the valence-bond solid state with local filtering operations

(2009)

Authors:

Heng Fan, Zi-Dan Wang, Vlatko Vedral
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Positive phase space transformation incompatible with classical physics.

Phys Rev Lett 102:11 (2009) 110404

Authors:

Wonmin Son, Johannes Kofler, MS Kim, Vlatko Vedral, Caslav Brukner

Abstract:

Bell conjectured that a positive Wigner function does not allow violation of the inequalities imposed by local hidden variable theories. A requirement for this conjecture is "when phase space measurements are performed." We introduce the theory-independent concept of "operationally local transformations" which refers to the change of the switch on a local measurement apparatus. We show that two separated parties, performing only phase space measurements on a composite quantum system with a positive Wigner function and performing only operationally local transformations that preserve this positivity, can nonetheless violate Bell's inequality. Such operationally local transformations are realized using entangled ancillae.
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