arXiv subjects

G. D. Maccarrone

Publications and source records attributed to G. D. Maccarrone.

2 recordsLinked to original sources

arXiv2019

Speedup of adiabatic multiqubit state-transfer by ultrastrong coupling of matter and radiation

Ultrastrongly coupled quantum hardware may increase the speed of quantum state processing in distributed architectures, allowing to approach fault-tolerant threshold. We show that circuit QED architectures in the ultrastrong coupling regime, which has been recently demonstrated with superconductors, may show substantial speedup for a class of adiabatic protocols resilient to the main source of errors, namely the interplay of dynamical Casimir effect and cavity losses.

quant-ph↗

arXiv2019

Photon pair production by STIRAP in ultrastrongly coupled matter-radiation systems

Artificial atoms (AA) offer the possibility to design physical systems implementing new regimes of ultrastrong coupling (USC) between radiation and matter, where previously unexplored non-perturbative physics emerges. While experiments so far provided only spectroscopic evidence of USC, we propose the dynamical detection of virtual photon pairs in the dressed eigenstates, which is a "smoking gun" of the very existence of USC in nature. We show how to coherently amplify this channel to reach 100% efficiency by operating advanced control similar to stimulated Raman adiabatic passage (STIRAP).

cond-mat.mes-hall↗