Catálogo de publicaciones - revistas

<jats:title>Quantum walks on a superconducting circuit</jats:title> <jats:p> Quantum walks generate large-scale quantum superposed states. This allows for classically unavailable applications, such as simulating many-body quantum systems, and also yields quantum algorithms exponentially faster than classical computation. Yan <jats:italic>et al.</jats:italic> demonstrate quantum walks of one and two strongly correlated microwave photons in a one-dimensional array of 12 superconducting qubits with short-range interactions. The scalability of the superconducting platform could lead to large-scale implementations and the quantum simulation of complex systems. </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="6442" page="753" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aaw1611">753</jats:related-article> </jats:p>

<jats:title>More-efficient heating</jats:title> <jats:p> Large-scale production of hydrogen through steam reforming directly produces CO <jats:sub>2</jats:sub> as a side product. In addition, the heating of reactors through fossil-fuel burning contributes further CO <jats:sub>2</jats:sub> emissions. One problem is that the catalyst bed is heated unevenly, which renders much of the catalyst effectively inactive. Wismann <jats:italic>et al.</jats:italic> describe an electrical heating scheme for a metal tube reactor that improves the uniformity of heating and catalyst usage (see the Perspective by Van Geem <jats:italic>et al.</jats:italic> ). Adoption of this alternative approach could affect CO <jats:sub>2</jats:sub> emissions by up to approximately 1% of global emissions. </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="6442" page="756" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aaw8775">756</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6442" page="734" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aax5179">734</jats:related-article> </jats:p>

<jats:title>A stronger, cooler wood</jats:title> <jats:p> One good way to reduce the amount of cooling a building needs is to make sure it reflects away infrared radiation. Passive radiative cooling materials are engineered to do this extremely well. Li <jats:italic>et al.</jats:italic> engineered a wood through delignification and re-pressing to create a mechanically strong material that also cools passively. They modeled the cooling savings of their wood for 16 different U.S. cities, which suggested savings between 20 and 50%. Cooling wood would be of particular value in hot and dry climates. </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="6442" page="760" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aau9101">760</jats:related-article> </jats:p>

<jats:title>Markovnikov falls to chromium and titanium</jats:title> <jats:p> Ring opening of strained triangular epoxides is a versatile method for making alcohols. However, these reactions are limited by their tendency to leave the oxygen on the more heavily substituted carbon, in accord with the Markovnikov rule. Yao <jats:italic>et al.</jats:italic> now show that a pair of catalysts working cooperatively can invert this selectivity pattern. A titanium catalyst pries the ring open while a chromium catalyst activates and delivers hydrogen. In an unusual mechanistic twist, the chromium complex appears to deliver a hydrogen atom, a proton, and an electron at different stages of the cycle. </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="6442" page="764" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aaw3913">764</jats:related-article> </jats:p>

<jats:title>Using earthquakes to find earthquakes</jats:title> <jats:p> Earthquake catalogs elucidate the behavior of faults and allow for rough estimates of when large earthquakes might occur. Cataloging small earthquakes is challenging because the small signal is often indistinguishable from noise. Ross <jats:italic>et al.</jats:italic> used a template-matching algorithm to find almost two million tiny earthquakes previously missed by other earthquake-logging techniques in Southern California (see the Perspective by Brodsky). This more-complete catalog can be used to better understand faults, earthquake reoccurrence, and other geophysical processes. </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="6442" page="767" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aaw6888">767</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6442" page="736" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aax2490">736</jats:related-article> </jats:p>

<jats:title>Superoscillatory displacement metrology</jats:title> <jats:p>The resolving power of light (or other waveforms, for that matter) is typically limited to about half the wavelength. However, multiple interference of waves gives rise to subwavelength “hotspots” in the phase owing to what is termed superoscillation of the wave field. Yuan and Zheludev used a specially designed metasurface to interfere laser light (wavelength λ = 800 nm) and created a superoscillatory ruler comprising these hotspots. They demonstrated the ability to measure displacements of around λ/800 while operating at a wavelength of 800 nm. They then showed theoretically that resolving powers of around λ/4000, i.e., atomic-scale displacements, may be possible. The technique should prove useful to metrology applications requiring precision measurements.</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="6442" page="771" related-article-type="in-this-issue" vol="364" xlink:href="10.1126/science.aaw7840">771</jats:related-article> </jats:p>