Algorithmic cooling of nuclear spins using long-lived singlet order

Bogdan A. Rodin, Christian Bengs, Alexey S. Kiryutin, Kirill F. Sheberstov, Lynda J. Brown, Richard C. D. Brown, Alexandra V. Yurkovskaya, Konstantin L. Ivanov, Malcolm H. Levitt

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

Algorithmic cooling methods manipulate an open quantum system in order to lower its temperature below that of the environment. We achieve significant cooling of an ensemble of nuclear spin-pair systems by exploiting the long-lived nuclear singlet state, which is an antisymmetric quantum superposition of the "up" and "down" Zeeman states. The effect is demonstrated by nuclear magnetic resonance experiments on a molecular system containing a coupled pair of near-equivalent C-13 nuclei. The populations of the system are subjected to a repeating sequence of cyclic permutations separated by relaxation intervals. The long-lived nuclear singlet order is pumped well beyond the unitary limit. The pumped singlet order is converted into nuclear magnetization which is enhanced by 21% relative to its thermal equilibrium value.

Язык оригиналаанглийский
Число страниц16
ЖурналJournal of Chemical Physics
Том152
Номер выпуска16
DOI
СостояниеОпубликовано - 30 апр 2020

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