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- Universidade Federal do ParanáBR6 papers
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6 papers · 1 filter
Unveiling and exemplifying the unitary equivalence of discrete time quantum walk models
B F Venancio, F M Andrade, M G E da Luz
The two major discrete time formulations for quantum walks, coined and scattering, are unitarily equivalent for arbitrary position dependent transition amplitudes and any topology…
Asymmetric Quantum Codes: New Codes from Old
Giuliano G. La Guardia
In this paper we extend to asymmetric quantum error-correcting codes (AQECC) the construction methods, namely: puncturing, extending, expanding, direct sum and the (u|u + v) constr…
Superdiffusivity of quantum walks: A Feynman sum-over-paths description
F. M. Andrade, M. G. E. da Luz
Quantum walks constitute important tools in different applications, especially in quantum algorithms. To a great extent their usefulness is due to unusual diffusive features, allow…
Nonrelativistic quantum dynamics on a cone with and without a constraining potential
C. Filgueiras, E. O. Silva, F. M. Andrade
In this paper we investigate the bound state problem of nonrelativistic quantum particles on a conical surface. This kind of surface appears as a topological defect in ordinary sem…
On Aharonov-Casher bound states
E. O. Silva, F. M. Andrade, H. Belich +1
In this work bound states for the Aharonov-Casher problem are considered. According to Hagen's work on the exact equivalence between spin-1/2 Aharonov-Bohm and Aharonov-Casher effe…
Cluster-type entangled coherent states
P. P. Munhoz, F. L. Semião, A. Vidiella-Barranco +1
We present the cluster-type entangled coherent states (CTECS) and discuss their properties. A cavity QED generation scheme using suitable choices of atom-cavity interactions, obtai…