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6 papers · 2 filters
Entropic uncertainties for joint quantum measurements
Thomas Brougham, Erika Andersson, Stephen M Barnett
We investigate the uncertainty associated with a joint quantum measurement of two components of spin of a spin-1/2 particle and quantify this in terms of entropy. We consider two e…
Chaos in a one-dimensional integrable quantum system
Petr Seba, Daniel Vasata
We study a simple one-dimensional quantum system on a circle with n scale free point interactions. The spectrum of this system is discrete and expressible as a solution of an expli…
Intrinsic properties of quantum systems
P. Hajicek, J. Tolar
A new realist interpretation of quantum mechanics is introduced. Quantum systems are shown to have two kinds of properties: the usual ones described by values of quantum observable…
Optimized quantum random-walk search algorithms
V. Potocek, A. Gabris, T. Kiss +1
Shenvi, Kempe and Whaley's quantum random-walk search (SKW) algorithm [Phys. Rev. A 67, 052307 (2003)] is known to require number of oracle queries to find the marked…
Improving quantum gate fidelities using optimized Euler angles
K. Ch. Chatzisavvas, G. Chadzitaskos, C. Daskaloyannis +1
An explicit algorithm for calculating the optimized Euler angles for both qubit state transfer and gate engineering given two arbitary fixed Hamiltonians is presented. It is shown…
Recurrence properties of unbiased coined quantum walks on infinite -dimensional lattices
Martin Stefanak, Tamas Kiss, Igor Jex
The Pólya number characterizes the recurrence of a random walk. We apply the generalization of this concept to quantum walks [M. Štefaňák, I. Jex and T. Kiss, Phys. Rev. Lett. \tex…