85 citations · 191 across the 10 of their papers we have counts for
10 papers · 1 filter
Barenco gate implementation using driven two- and three-qubit spin chains
Rafael Vieira, Edgard P. M. Amorim
We propose a protocol for implementing Barenco-type multi-qubit controlled gates using short driven spin chains. Starting from an Ising interaction with a transverse drive on the l…
Parrondo-type enhancement of quantum-state transfer in spin chains
Rafael Vieira, Edgard P. M. Amorim
Spin chains have been widely studied as quantum channels for short-distance communication in quantum devices, where many-body dynamics can mediate quantum-state transfer between di…
Control of vertex probability via edge-weight modulation in continuous-time quantum walks
Rafael Vieira, Edgard P. M. Amorim
Continuous-time quantum walks (CTQWs) provide a versatile framework for exploring quantum transport on graphs. In this work, we investigate how the introduction of edge-weight modu…
High-fidelity state transfer via quantum walks from delocalized states
João P. Engster, Rafael Vieira, Eduardo I. Duzzioni +1
We study the state transfer through quantum walks placed on a bounded one-dimensional path. We first consider continuous-time quantum walks from a Gaussian state. We find such a st…
Quantum Corralling
Rafael Vieira, Gustavo Rigolin, Edgard P. M. Amorim
We propose a robust and efficient way to store and transport quantum information via one-dimensional discrete time quantum walks. We show how to attain an effective dispersionless…
Almost perfect transmission of multipartite entanglement through disordered and noisy spin chains
Rafael Vieira, Gustavo Rigolin
We show how to efficiently send an M-partite entangled state along a spin chain of arbitrary size. Specifically, we show how an entangled M-partite W sate can be almost flawlessly…
Robust and efficient transport of two-qubit entanglement via disordered spin chains
Rafael Vieira, Gustavo Rigolin
We investigate how robust is the modified XX spin-1/2 chain of [R. Vieira and G. Rigolin, Phys. Lett. A 382, 2586 (2018)] in transmitting entanglement when several types of disorde…
Almost perfect transport of an entangled two-qubit state through a spin chain
Rafael Vieira, Gustavo Rigolin
We show that using a slightly modified XX model for a spin-1/2 chain, one can transmit almost perfectly a maximally entangled two-qubit state from one end of the chain to the other…
Entangling Power of Disordered Quantum Walks
Rafael Vieira, Edgard P. M. Amorim, Gustavo Rigolin
We investigate how the introduction of different types of disorder affects the generation of entanglement between the internal (spin) and external (position) degrees of freedom in…
Dynamically Disordered Quantum Walk as a Maximal Entanglement Generator
Rafael Vieira, Edgard P. M. Amorim, Gustavo Rigolin
We show that the entanglement between the internal (spin) and external (position) degrees of freedom of a qubit in a random (dynamically disordered) one-dimensional discrete time q…