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quant-ph2025
Directionality and quantum backfire in continuous-time quantum walks from delocalized states: Exact results
Jefferson J. Ximenes, Marcelo A. Pires, José M. Villas-Bôas
We derive analytical results for continuous-time quantum walks from a new class of initial states with tunable delocalization. The dynamics are governed by a Hamiltonian with compl…
quant-ph2025
Enhanced spreading in continuous-time quantum walks using aperiodic temporal modulation of defects
José J. Ximenes, Marcelo A. Pires, José M. Villas-Bôas
Parrondo's paradox, where the alternation of two losing strategies can produce a winning outcome, has recently been demonstrated in continuous-time quantum walks (CTQWs) through pe…
quant-ph2023
Parrondo's effect in continuous-time quantum walks
J. J. Ximenes, M. A. Pires, J. M. Villas-Boas
We present the first manifestation of a Parrondo's effect in a continuous-time quantum walk (CTQW). In our protocol we consider a CTQW in the presence of time-dependent transition…