The living state

Sergey F. Belykh, А. Б. Толстогузов, Anatoly Bekkerman +1 more

A method has been proposed for the direct detection and study of long-lived excited states of singly and multiply charged ions of transition and rare earth metals. It allows both the measurement of the photon spectra from the decay of long-lived states of ions with a given charge, as well as the lifetimes of such states, and the investigation of the influence of an electric field on the characteristics of long-lived states. The fast electric-field-induced decay of long-lived states has been found for the first time.

Chanda Prescod-Weinstein

T. S. Mahesh, Deepak Khurana

NMR spectroscopy relies on the fact that nuclear spin ensembles in bulk samples under ambient conditions sustain quantum superpositions for durations long enough to implement intricate quantum dynamics. The discovery of long-lived nuclear spin order further enhanced the scope of NMR experiments paving the way for novel applications. In this chapter, we look at the long-lived singlet state (LLSS) from the perspectives of NMR quantum information, wherein the two Zeeman eigenstates of a spin-1/2 nucleus are treated as 0 and 1 states of a quantum bit. In particular, we discuss the following topics: density matrix tomography of the LLSS, initialization of a quantum register via the LLSS, noise spectroscopy of the LLSS, and numerical optimization methods to prepare the LLSS.

Arthur Rose-Innes, E. H. Rhoderick

Koichiro Miyanishi, Naoki Ichijo, Makoto Motoyama +3 more

Abstract A solution with hyperpolarized nuclear spins encoded into a long-lived state has been utilized for sensing chemical phenomena. In a conventional way, nuclear spins are hyperpolarized at very low temperatures. In this work, we demonstrate the encoding of a four-nuclear-spin system hyperpolarized at room temperature into a long-lived state in a solution. We apply the solution with the long-lived state as a sensor in ligand-receptor binding experiments.

Coraci Pereira Malta, São Paulo Sp, Bochum