“It provides a natural framework, or a bookkeeping mechanism, to assemble very large numbers of Feynman diagrams,” said Marcus Spradlin, a physicist at Brown University who has been picking up …
But not all questions about quantum systems are easier to answer using quantum algorithms. Some are equally easy for classical algorithms, which run on ordinary computers, while others are hard …
A key question was the origin of the logarithmic scaling of the greenhouse effect—the 2-to-5-degree temperature rise that models predict will happen for every doubling of CO2. One theory held …
But there may be opportunities to indirectly spot the signatures of those gravitons. One strategy Vafa and his collaborators are pursuing draws on large-scale cosmological surveys that chart the distribution …
Andersen and Lensky of Google disagree. They do not think the experiment demonstrates a topological qubit, because the object cannot reliably manipulate information to achieve practical quantum computing. “It is …
Quantum entanglement (illustration) is one of the effects that underpins quantum-computing technology.Credit: Peter Jurik/Alamy Physicists have taken the first step towards building quantum computers out of individual molecules trapped with …
The original version of this story appeared in Quanta Magazine. To catch a glimpse of the subatomic world’s unimaginably fleet-footed particles, you need to produce unimaginably brief flashes of light. …