Algorithmic cooling of nuclear spins using long-lived singlet order

Algorithmic cooling of nuclear spins using long-lived singlet order Full article

Journal

The Journal of Chemical Physics
ISSN: 0021-9606

Output data

Year: 2020, Volume: 152, Number: 16, Article number : 164201, Pages count : 16 DOI: 10.1063/5.0006742

Authors

Rodin Bogdan A. ^1,2 , Bengs Christian ³ , Kiryutin Alexey S. ^1,2 , Sheberstov Kirill F. ⁴ , Brown Lynda J. ³ , Brown Richard C.D. ³ , Yurkovskaya Alexandra V. ^1,2 , Ivanov Konstantin L. ^1,2 , Levitt Malcolm H. ³

Affiliations

1	International Tomography Center SB RAS, Novosibirsk, Russia
2	Novosibirsk State University, Novosibirsk, Russia
3	Department of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
4	Johannes Gutenberg-Universität, Helmholtz Institute Mainz, Mainz 55099, Germany

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 13C 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.

Rodin B.A. , Bengs C. , Kiryutin A.S. , Sheberstov K.F. , Brown L.J. , Brown R.C.D. , Yurkovskaya A.V. , Ivanov K.L. , Levitt M.H.
Algorithmic cooling of nuclear spins using long-lived singlet order
The Journal of Chemical Physics. 2020. V.152. N16. 164201 :1-16. DOI: 10.1063/5.0006742

Submitted:	Mar 5, 2020
Accepted:	Apr 3, 2020
Published online:	Apr 27, 2020

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