title: Scalable spin amplification with a gain over a hundred.
abstract: We propose a scalable and practical implementation of spin amplification which does not require individual addressing nor a specially tailored spin network. We have demonstrated a gain of 140 in a solid-state nuclear spin system of which the spin polarization has been increased to 0.12 using dynamic nuclear polarization with photoexcited triplet electron spins. Spin amplification scalable to a higher gain opens the door to the single spin measurement for a readout of quantum computers as well as practical applications of nuclear magnetic resonance spectroscopy to infinitesimal samples which have been concealed by thermal noise.
authors.affiliation: Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Negoro
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Tateishi
authors.forename: Akinori
authors.initials: A
authors.lastname: Kagawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kitagawa