Rapid
and robust generation of Einstein-–Podolsky–-Rosen pairs with spin
chains
(pp0247-0264)
Kieran N. Wilkinson, Marta P. Estarellas, Timothy P.
Spiller, and Irene D'Amico
doi:
https://doi.org/10.26421/QIC18.3-4-5
Abstracts:
We investigate the ability of dimerized spin
chains with defects to generate EPR pairs
to very high fidelity through their natural dynamics. We propose two
protocols based on different initializations of
the system, which yield the same maximally entangled Bell state after a
characteristic time. This entangling time can be varied through
engineering the weak/strong couplings' ratio of the chain, with larger
values giving rise to an exponentially faster quantum entangling
operation. We demonstrate that there is a set of characteristic values
of the coupling, for which the entanglement generated remains extremely
high. We investigate the robustness of both protocols to diagonal and
off-diagonal disorder. Our results demonstrate extremely strong
robustness to both perturbation types, up to strength of 50\%
of the weak coupling. Robustness to disorder can be further enhanced by
increasing the coupling ratio. The combination of these properties makes
the use of our proposed device suitable for the rapid and robust
generation of Bell states in quantum information processing
applications.
Key words:
Einstein-Podolsky-Rosen pairs, spin chains, Bell state |