Quantum physics trick means we could send information twice as fast

Tech & Science Quantum Physics Information Security Our world is all about information, so perhaps it’s no surprise that quantum physicists think about how they can manipulate their field to send information faster. And in a pair of recent papers, a team of quantum scientists have outlined a way to do just that—and in a way that no wannabe spy could ever listen in on. The gist of the technique feels a bit like the famous riddle in which two guards—one of whom always tells the truth and one of whom always lies—protect two doors, one of which hides a tiger. The trick is to always ask what the other guard would say: that way, it doesn’t matter whether you’ve asked the truthful guard or the lying one, you have precisely one lie and one truth in the answer, so you can work backwards to avoid the tiger. The physicists’ technique could mean information can travel twice as fast—with complete security. Leon Neal/Getty Images See all of the best photos of the week in these slideshows In the quantum communication scenario, it’s not about truth and lies, it’s about knowledge and uncertainty between two people. For simplicity, imagine the tiniest message possible, which includes either yes or no, no additional information. Each person knows what message they sent. Traditionally, each person would send their yes or no encoded in a particle of light and the other person would receive it based on how long light takes to bridge the distance between… [Read full story]

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