Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Kleinmann, M."'
Autor:
Amselem, E., Bourennane, M., Budroni, C., Cabello, A., Gühne, O., Kleinmann, M., Larsson, J. -Å., Wieśniak, M.
Publikováno v:
Phys. Rev. Lett. 110, 078901 (2013)
We argue that the experiment described in the recent Letter by Zu et al. [Phys. Rev. Lett. 109, 150401 (2012); arXiv:1207.0059v1] does not allow to make conclusions about contextuality, since the measurement of the observables as well as the preparat
Externí odkaz:
http://arxiv.org/abs/1302.0617
Publikováno v:
Phys. Rev. A 84, 042326 (2011)
We revisit the problem of discriminating orthogonal quantum states within the local quantum operation and classical communication (LOCC) paradigm. Our particular focus is on the asymptotic situation where the parties have infinite resources and the p
Externí odkaz:
http://arxiv.org/abs/1105.5132
Autor:
Gühne, O., Kleinmann, M., Cabello, A., Larsson, J. -A., Kirchmair, G., Zähringer, F., Gerritsma, R., Roos, C. F.
Publikováno v:
Phys. Rev. A 81, 022121 (2010)
A basic assumption behind the inequalities used for testing noncontextual hidden variable models is that the observables measured on the same individual system are perfectly compatible. However, compatibility is not perfect in actual experiments usin
Externí odkaz:
http://arxiv.org/abs/0912.4846
Publikováno v:
Phys. Rev. A 80, 032324 (2009)
Is the closest product state to a symmetric entangled multiparticle state also symmetric? This question has appeared in the recent literature concerning the geometric measure of entanglement. First, we show that a positive answer can be derived from
Externí odkaz:
http://arxiv.org/abs/0905.4822
Autor:
Kirchmair, G., Zähringer, F., Gerritsma, R., Kleinmann, M., Gühne, O., Cabello, A., Blatt, R., Roos, C. F.
Publikováno v:
Nature 460, 494 (2009)
The question of whether quantum phenomena can be explained by classical models with hidden variables is the subject of a long lasting debate. In 1964, Bell showed that certain types of classical models cannot explain the quantum mechanical prediction
Externí odkaz:
http://arxiv.org/abs/0904.1655
Publikováno v:
Phys. Rev. A 81, 020304(R) (2010)
We present a generic study of unambiguous discrimination between two mixed quantum states. We derive operational optimality conditions and show that the optimal measurements can be classified according to their rank. In Hilbert space dimensions small
Externí odkaz:
http://arxiv.org/abs/0807.3923
Publikováno v:
J. Math. Phys. 51, 032201 (2010)
We analyze the optimal unambiguous discrimination of two arbitrary mixed quantum states. We show that the optimal measurement is unique and we present this optimal measurement for the case where the rank of the density operator of one of the states i
Externí odkaz:
http://arxiv.org/abs/0803.1083
Publikováno v:
J. Phys. A: Math. Theor. 40 (2007) F871-F878
We present a criterion, based on three commutator relations, that allows to decide whether two self-adjoint matrices with non-overlapping support are simultaneously unitarily similar to quasidiagonal matrices, i.e., whether they can be simultaneously
Externí odkaz:
http://arxiv.org/abs/0705.3391
Publikováno v:
Phys. Rev. A 73, 062309 (2006)
We introduce the concept of a physical process that purifies a mixed quantum state, taken from a set of states, and investigate the conditions under which such a purification map exists. Here, a purification of a mixed quantum state is a pure state i
Externí odkaz:
http://arxiv.org/abs/quant-ph/0509100
Publikováno v:
Phys. Rev. A 72, 032308 (2005)
We investigate the unambiguous comparison of quantum states in a scenario that is more general than the one that was originally suggested by Barnett et al. First, we find the optimal solution for the comparison of two states taken from a set of two p
Externí odkaz:
http://arxiv.org/abs/quant-ph/0503012