6 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…
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…
Generation of inequivalent generalized Bell bases
A. Wojcik, A. Grudka, R. W. Chhajlany
The notion of equivalence of maximally entangled bases of bipartite d-dimensional Hilbert spaces is introduced. An explicit method of inequivalent bases construction is presented.
Measurement of the overlap between quantum states with the use of coherently addressed teleportation
Andrzej Grudka, Antoni Wojcik
We will show how to measure the overlap between photon polarization states with the use of linear optics and postselection only. Our scheme is based on quantum teleportation and su…
Multiparty d-dimensional quantum information splitting
Andrzej Grudka, Antoni Wojcik
Generalization of quantum information splitting protocol from qubits to qudits (quantum d-dimensional systems) is presented.