Catálogo de publicaciones - revistas

<jats:title>A three-node quantum network</jats:title> <jats:p> Future quantum networks will provide the means to develop truly secure communication channels and will have applications in many other quantum-based technologies. Pompili <jats:italic>et al.</jats:italic> present a three-node remote quantum network based on solid-state spin qubits (nitrogen-vacancy centers in diamond) coupled by photons. The implementation of two quantum protocols on the network. entanglement distribution and entanglement swapping, illustrates a key platform for exploring, testing, and developing multinode quantum networks and quantum protocols. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6539" page="259" related-article-type="in-this-issue" vol="372">259</jats:related-article> </jats:p>

<jats:title>Twisted and nematic</jats:title> <jats:p> Electrons in quantum materials can break rotational symmetry even when the underlying crystal lattice does not. This phenomenon, called nematicity, has been observed in many unconventional superconductors. Cao <jats:italic>et al.</jats:italic> found that magic-angle twisted bilayer graphene, in which superconductivity was recently discovered, also exhibits nematicity. The breaking of rotational symmetry was observed through transport measurements, which exhibited characteristic anisotropy. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6539" page="264" related-article-type="in-this-issue" vol="372">264</jats:related-article> </jats:p>

<jats:title>A minimal Weyl semimetal</jats:title> <jats:p> Many compounds have now been identified as Weyl semimetals, materials with an unusual electronic band structure characterized by the so-called Weyl points. Weyl points always appear in pairs, but the solid-state materials studied so far have at least four. Wang <jats:italic>et al.</jats:italic> engineered a Weyl semimetallic state with the minimum number of Weyl points (two) in a gas of ultracold atoms trapped in an optical lattice (see the Perspective by Goldman and Yefsah). To do that, the researchers had to create three-dimensional spin-orbit coupling in this system. The relative simplicity of the resulting band structure will make it easier to observe the unusual effects associated with this state. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6539" page="271" related-article-type="in-this-issue" vol="372">271</jats:related-article> ; see also p. <jats:related-article issue="6539" page="234" related-article-type="in-this-issue" vol="372">234</jats:related-article> </jats:p>

<jats:title>A gapped spin liquid</jats:title> <jats:p> Quantum spin liquids avoid conventional magnetic ordering down to the lowest temperatures. Among the candidates for this state of matter, organic salts such as κ-(BEDT-TTF) <jats:sub>2</jats:sub> Cu <jats:sub>2</jats:sub> (CN) <jats:sub>3</jats:sub> have been prominent. Miksch <jats:italic>et al.</jats:italic> studied this material using electron spin resonance to elucidate the nature of its ground state. Instead of the expected gapless state, the temperature dependence of spin susceptibility suggests the formation of a spin gap. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6539" page="276" related-article-type="in-this-issue" vol="372">276</jats:related-article> </jats:p>