Zobrazeno 1 - 10
of 943
pro vyhledávání: '"Oppenheim J"'
Publikováno v:
Theory of Cryptography: Second Theory of Cryptography Conference, TCC 2005, J.Kilian (ed.) Springer Verlag 2005, vol. 3378 of Lecture Notes in Computer Science, pp. 386-406
The existing unconditional security definitions of quantum key distribution (QKD) do not apply to joint attacks over QKD and the subsequent use of the resulting key. In this paper, we close this potential security gap by using a universal composabili
Externí odkaz:
http://arxiv.org/abs/quant-ph/0409078
Autor:
Oppenheim, J., Reznik, B.
Publikováno v:
Phys. Rev. A. 70 022312 (2004)
In quantum mechanics, outcomes of measurements on a state have a probabilistic interpretation while the evolution of the state is treated deterministically. Here we show that one can also treat the evolution as being probabilistic in nature and one c
Externí odkaz:
http://arxiv.org/abs/quant-ph/0312149
Autor:
Oppenheim, J.
The connection between gravity and thermodynamics is explored. Examining a perfect fluid in gravitational equilibrium we find that the entropy is extremal only if Einstein's equations are satisfied. Conversely, one can derive part of Einstein's equat
Externí odkaz:
http://arxiv.org/abs/gr-qc/0112001
Publikováno v:
J.Phys.A35:7641-7652,2002
We examine the measurability of the temporal ordering of two events, as well as event coincidences. In classical mechanics, a measurement of the order-of-arrival of two particles is shown to be equivalent to a measurement involving only one particle
Externí odkaz:
http://arxiv.org/abs/quant-ph/0003130
The role of time in quantum mechanics is discussed. The differences between ordinary observables and an observable which corresponds to the time of an event is examined. In particular, the time-of-arrival of a particle to a fixed location is not an o
Externí odkaz:
http://arxiv.org/abs/quant-ph/9807058
Publikováno v:
Phys.Rev. A59 (1999) 1804
Although one can show formally that a time-of-arrival operator cannot exist, one can modify the low momentum behaviour of the operator slightly so that it is self-adjoint. We show that such a modification results in the difficulty that the eigenstate
Externí odkaz:
http://arxiv.org/abs/quant-ph/9807043
Publikováno v:
Found.Phys.Lett. 13 (2000) 107-118
Within quantum mechanics it is possible to assign a probability to the chance that a measurement has been made at a specific time t. However, the interpretation of such a probability is far from clear. We argue that a recent measuring scheme of Rovel
Externí odkaz:
http://arxiv.org/abs/quant-ph/9805064
Using various model clocks it has been shown that the time-of-arrival cannot be measured more accurately than 1/E where E is the kinetic energy of a free particle. However, this result has never been proved. In this paper, we show that a violation of
Externí odkaz:
http://arxiv.org/abs/quant-ph/9801034
Autor:
Resnati, M., Pallavicini, I., Wang, J. M., Oppenheim, J., Serhan, C. N., Romano, M., Blasi, F.
Publikováno v:
Proceedings of the National Academy of Sciences of the United States of America, 2002 Feb 01. 99(3), 1359-1364.
Externí odkaz:
https://www.jstor.org/stable/3057766
Publikováno v:
Phys.Rev. A57 (1998) 4130
It is argued that the time-of-arrival cannot be precisely defined and measured in quantum mechanics. By constructing explicit toy models of a measurement, we show that for a free particle it cannot be measured more accurately then $\Delta t_A \sim 1/
Externí odkaz:
http://arxiv.org/abs/quant-ph/9709031