nt - p h / 06 02 15 8 v 1 20 F eb 2 00 6 Single photon continuous variable quantum key distribution based on energy - time uncertainty relation
نویسنده
چکیده
In previous quantum key distribution (QKD) protocols, information is encoded on either the discrete-variable of single-photon signal or continuous-variables of multi-photon signal. Here, we propose a new QKD protocol by encoding information on continuous-variables of a single photon. In this protocol, Alice randomly encodes her information on either the central frequency of a narrowband single photon pulse or the time-delay of a broadband single photon pulse, while Bob randomly chooses to do either frequency measurement or time measurement. The security of this protocol rests on the energy-time uncertainty relation, which prevents Eve from simultaneously determining both frequency and time information with arbitrarily high resolution. In practice, this scheme may be more robust against various channel noises, such as polarization and phase fluctuations.
منابع مشابه
nt - p h / 01 02 03 8 v 1 6 F eb 2 00 1 Quasiprobability and Probability Distributions for Spin 1 / 2 States ∗
We develop a Radon like transformation, in which P quasiprobability distribution for spin 1/2 states is written in terms of the tomographic probability distribution w.
متن کاملnt - p h / 06 02 17 6 v 1 21 F eb 2 00 6 Quantum states representing perfectly secure bits are always distillable
It is proven that recently introduced states with perfectly secure bits of cryptographic key (called p-bit states) [K. Horodecki et al., Phys. Rev. Lett. 94, 160502 (2005)] as well as its multipartite and higher dimension generalizations always represent distillable entanglement. The corresponding lower bounds on distillable entanglement are provided. We also present a simple alternative proof ...
متن کاملua nt - p h / 01 02 02 5 v 1 5 F eb 2 00 1 Teleportation with indistinguishable particles . ∗
We analyze in a critical way the mathematical treatment of a quantum teleportation experiment performed with photon particles, showing that a symmetrization operation over both the polarization and spatial degrees of freedom of all the particles involved is necessary in order to reproduce correctly the observed experimental data.
متن کاملar X iv : h ep - p h / 06 05 22 8 v 1 2 2 M ay 2 00 6 FLAVOR NEUTRINO OSCILLATIONS AND TIME - ENERGY UNCERTAINTY RELATION 1
We consider neutrino oscillations as non stationary phenomenon based on Schrodinger evolution equation and mixed states of neutrinos with definite flavors. We show that time-energy uncertainty relation plays a crucial role in neutrino oscillations. We compare neutrino oscillations with B 0 d ⇆ ¯ B 0 d oscillations.
متن کامل