4 papers · 1 filter
Illusion of quantum speed-up
Antoni Wojcik, Ravindra W. Chhajlany
Quantum computers are believed to surpass the classical ones. Moreover, it is claimed that this belief reaches the level of a mathematically proven fact within the oracle model of…
Quasiperiodic dynamics of coherent diffusion: a quantum walk approach
A. Wojcik, T. Luczak, P. Kurzynski +2
We study the dynamics of a generalization of quantum coin walk on the line which is a natural model for a diffusion modified by quantum or interference effects. In particular, our…
Examples of nonuniform limiting distributions for the quantum walk on even cycles
Malgorzata Bednarska, Andrzej Grudka, Pawel Kurzynski +2
In the note we show how the choice of the initial states can influence the evolution of time-averaged probability distribution of the quantum walk on even cycles.
Erasure versus teleportation scheme of optical CNOT gate
Antoni Wojcik, Andrzej Grudka
We clarify the connections between the erasure scheme of probabilistic CNOT gate implementation recently proposed by Pittman, Jacobs and Franson [Phys. Rev. A 64, 062311 (2001)] an…