Fast qubits of optical frequencies on the rare-earth ions in fluoride crystals and color centers in diamond

Vladimir Hizhnyakov; Vadim Boltrushko; Aleksander Shelkan; Yurii Orlovskii

paper

Fast qubits of optical frequencies on the rare-earth ions in fluoride crystals and color centers in diamond

arXiv:2103.13319

Abstract

Fluoride crystals doped with rare-earth ions (REI) and pair centers in diamond for fast ( $1 0^{- 9} s$ ) quantum computers (FQC) are proposed. As specific systems for REI doping, we propose $C a_{1 - x} S r_{x} F_{2}$ crystals and their analogues. The $^{4} f$ -states with different total orbital angular moments of these ions serve as two-level systems (qubits). Suitable REIs are proposed as well. It is established that the pair $S iV$ and $G e V$ centers in diamond are promising systems for fast optical quantum computers operating at elevated temperatures.