Long-lived state in a four-spin system hyperpolarized at room temperature

Koichiro Miyanishi¹, Naoki Ichijo¹, Makoto Motoyama¹, Akinori Kagawa^1,2, Makoto Negoro^2,3 and Masahiro Kitagawa^1,2

¹ Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

² Quantum Information and Quantum Biology Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Japan

³ JST, PRESTO, Kawaguchi, Japan