By GREGORY ZELLER // Quantum-memory applications that can prevent hackers from accessing digital-communications networks? At room temperature? Pshaw, you say! Actually, you probably don’t say “pshaw” or make any other dismissive comment, because unless you’re a quantum-information expert with a PhD in nanotechnology – or you’re otherwise familiar with quantum-repeater nodes, single-photon wave packets and other niceties of quantum IT – this likely sounds like so much recycled “Star Trek” gobbledygook. But it’s hardly that….