Results 21 to 30 of about 2,422 (38)

Expanded Quantum Cryptographic Entangling Probe

, 2005
The paper [Howard E. Brandt, "Quantum Cryptographic Entangling Probe," Phys. Rev. A 71, 042312 (2005)] is generalized to include the full range of error rates for the projectively measured quantum cryptographic entangling probe.Comment: 4 ...
Brandt, Howard E., Myers, John M.
core   +1 more source

Comment on "Entanglement transformation between two-qubit mixed states by LOCC" [Phys. Lett. A 373 (2009) 3610]

, 2010
The paper [Phys. Lett. A 373 (2009) 3610] by D.-C. Li analyzes the transformation between two-qubit mixed states by local operations and classical communication. We show that the proof of the main theorem, Theorem 2.6 in [Phys. Lett.
Bennett, Gheorghiu, Gour, Horodecki, Iulia Ghiu, Jonathan, Li, Nielsen, Sperling   +8 more
core   +1 more source

A genuine four-partite entangled state

, 2008
In a recent paper, a genuine four-partite entangled state is proposed [Y. Yeo and W. K. Chua, Phys. Rev. Lett. 96, 060502 (2006)], which has been found to have many interesting entanglement properties.
Bennett, Bennett, Chen, Greenberger, Hein, Man, Ming-Yong Ye, Van den Nest, Wu, Xiu-Min Lin, Yeo, Zha   +11 more
core   +1 more source

Comment on "Quantum key distribution without alternative measurements"

, 2000
In a recent paper [A. Cabello, Phys. Rev. A 61, 052312 (2000)], a quantum key distribution protocol based on entanglement swapping was proposed. However, in this comment, it is shown that this protocol is insecure if Eve use a special strategy to attack ...
A. Cabello, C. H. Bennett, Chuan-Feng Li, Guang-Can Guo, J.-W. Pan, M. Zukowski, S. Bose, Yong-Sheng Zhang   +7 more
core   +1 more source

Comment on "Single-mode excited entangled coherent states"

, 2009
In Xu and Kuang (\textit{J. Phys. A: Math. Gen.} 39 (2006) L191), the authors claim that, for single-mode excited entangled coherent states $| \Psi_{\pm}(\alpha,m)>$, \textquotedblleft the photon excitations lead to the decrease of the concurrence in the
Hong-chun Yuan, Hu L Y, Hu L Y, Li-yun Hu, Wang X G, Wünsche A, Xu L   +6 more
core   +1 more source

How many ebits can be unlocked with one classical bit?

, 2007
We find an upper bound on the rate at which entanglement can be unlocked by classical bits. In particular, we show that for quantum information sources that are specified by ensambles of pure bipartite states, one classical bit can unlock at most one ...
Gour, Gilad
core   +1 more source

Comment on "A special attack on the multiparty quantum secret sharing of secure direct communication using single photons"

, 2010
In this comment, we show that the special attack [S.-J. Qin, F. Gao, Q.-Y. Wen, F.-C. Zhu, Opt. Commun. 281 (2008) 5472.], which claims to be able to obtain all the transmitted secret message bit values of the protocol of the multiparty quantum secret ...
Cheng-An Yen, Han, Hsi-Sheng Goan, Qin, Shi-Jinn Horng, Tzong-Wann Kao   +5 more
core   +1 more source

Entanglement production in quantum decision making

, 2010
The quantum decision theory introduced recently is formulated as a quantum theory of measurement. It describes prospect states represented by complex vectors of a Hilbert space over a prospect lattice.
A. Vedral, C. P. Williams, D. Sornette, J. Neumann Von, M. Goldberg, M. Goldberg, P. A. Benioff, V. I. Yukalov, V. I. Yukalov, V. I. Yukalov, V. I. Yukalov, V. I. Yukalov, V. I. Yukalov, V. I. Yukalov   +13 more
core   +1 more source

Probabilities of multiple quantum teleportation [PDF]

, 2002
Using quantum teleportation a quantum state can be teleported with a certain probability. Here the probabilities for multiple teleportation are derived, i. e.
Woesler, Richard
core  

Comment on "Information flow of quantum states interacting with closed timelike curves"

, 2011
We show that recent results on the interaction of causality-respecting particles with particles on closed timelike curves derived in [Phys. Rev. A 82, 062330 (2010)] depend on ambiguous assumption about the form of the state which is inputted into the ...
Grudka, Andrzej, Klobus, Waldemar, Wojcik, Antoni   +2 more
core   +1 more source