Catálogo de publicaciones - revistas

<jats:title>Extending the coherence time of molecules</jats:title> <jats:p> Quantum properties of atoms and molecules can be exploited for precision measurements or quantum information processing. The complex state structure of molecules can be exploited, but it is hard to preserve the coherence between pairs of those states in applications. Park <jats:italic>et al.</jats:italic> created fermionic molecules of NaK in the rovibrational ground state that maintained coherence between their nuclear spin states on a time scale of 1 second. This long coherence time makes dipolar ultracold molecules a valuable quantum resource. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6349" page="372" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aal5066">372</jats:related-article> </jats:p>

<jats:title>Spectral narrowing of x-rays</jats:title> <jats:p> Modern photon factories typically provide x-ray pulses that are orders of magnitude broader in frequency space than the corresponding atomic or nuclear resonances to be probed. For many spectroscopic applications, however, narrower x-ray light sources are desired. By using precise mechanical displacements of a reference absorber to simulate the effect of an x-ray control field, Heeg <jats:italic>et al.</jats:italic> show that they can spectrally narrow input x-ray pulses. The conversion of off-resonant photons into resonant ones results in increased pulse brilliance at the desired resonant frequency, thereby providing a sharp x-ray probe for precision spectroscopy. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6349" page="375" related-article-type="in-this-issue" vol="357" xlink:href="10.1126/science.aan3512">375</jats:related-article> </jats:p>