@article{8180,
  abstract     = {{Given a bipartite quantum state rho with subsystems A and B of arbitrary dimensions, we study the entanglement detecting capabilities of locally noneffective, or cyclic, unitary operations [L. B. Fu, Europhys. Lett., vol. 75, pp. 1-7, 2006]. Local cyclic unitaries have the special property that they leave their target subsystem invariant. We investigate the distance between rho and the global state after local application of such unitaries as a possible indicator of entanglement. To this end, we derive and discuss closed formulae for the maximal such distance achievable for three cases of interest: (pseudo)pure quantum states, Werner states, and two-qubit states. What makes this criterion interesting, as we show here, is that it surprisingly displays behavior similar to recent anomalies observed for non-locality measures in higher dimensions, as well as demonstrates an equivalence to the CHSH inequality for certain classes of two-qubit states. Yet, despite these similarities, the criterion is not itself a non-locality measure. We also consider entanglement detection in bound entangled states.}},
  author       = {{Gharibian, Sevag and Kampermann, Hermann and Bru{\ss}, Dagmar}},
  journal      = {{Quantum Information & Computation}},
  number       = {{11}},
  pages        = {{1013--1029}},
  title        = {{{On global effects caused by locally noneffective unitary operations}}},
  volume       = {{9}},
  year         = {{2009}},
}

@article{8181,
  abstract     = {{We investigate signatures of non-classicality in quantum states, in particular, those involved in the DQC1 model of mixed-state quantum computation [Phys. Rev. Lett. 81, 5672 (1998)]. To do so, we consider two known non-classicality criteria. The first quantifies disturbance of a quantum state under locally noneffective unitary operations (LNU), which are local unitaries acting invariantly on a subsystem. The second quantifies measurement induced disturbance (MID) in the eigenbasis of the reduced density matrices. We study the role of both figures of non-classicality in the exponential speedup of the DQC1 model and compare them vis-a-vis the interpretation provided in terms of quantum discord. In particular, we prove that a non-zero quantum discord implies a non-zero shift under LNUs. We also use the MID measure to study the locking of classical correlations [Phys. Rev. Lett. 92, 067902 (2004)] using two mutually unbiased bases (MUB). We find the MID measure to exactly correspond to the number of locked bits of correlation. For three or more MUBs, it predicts the possibility of superior locking effects.}},
  author       = {{Datta, Animesh and Gharibian, Sevag}},
  issn         = {{1050-2947}},
  journal      = {{Physical Review A}},
  number       = {{4}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Signatures of nonclassicality in mixed-state quantum computation}}},
  doi          = {{10.1103/physreva.79.042325}},
  volume       = {{79}},
  year         = {{2009}},
}

@article{37680,
  author       = {{Silberhorn, Ch. and Korolkova, N. and Leuchs, G.}},
  issn         = {{0031-9007}},
  journal      = {{Physical Review Letters}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{16}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Quantum Key Distribution with Bright Entangled Beams}}},
  doi          = {{10.1103/physrevlett.88.167902}},
  volume       = {{88}},
  year         = {{2002}},
}