quantum gravity – Quanta Magazine

Can Information Escape a Black Hole?

Janna Levin — Thu, 11 Apr 2024 13:09:00 +0000

Nothing escapes a black hole … or does it? In the 1970s, the physicist Stephen Hawking described a subtle process by which black holes can “evaporate,” with some particles evading gravitational oblivion. That phenomenon, now dubbed Hawking radiation, seems at odds with general relativity, and it raises an even weirder question: If particles can escape, do they preserve any information about the...

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What Is Quantum Teleportation?

Janna Levin — Thu, 14 Mar 2024 13:00:37 +0000

Quantum teleportation isn’t just science fiction; it’s entirely real and happening in laboratories today. But teleporting quantum particles and information is a far cry from beaming people through space. In some ways, it’s even more astonishing. John Preskill, a theoretical physicist at the California Institute of Technology, is one of the leading theoreticians of quantum computing and information.

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Never-Repeating Tiles Can Safeguard Quantum Information

Ben Brubaker — Fri, 23 Feb 2024 14:50:29 +0000

If you want to tile a bathroom floor, square tiles are the simplest option — they fit together without any gaps in a grid pattern that can continue indefinitely. That square grid has a property shared by many other tilings: Shift the whole grid over by a fixed amount, and the resulting pattern is indistinguishable from the original. But to many mathematicians, such “periodic” tilings are boring.

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The Year in Physics

Nadia Drake — Thu, 21 Dec 2023 21:06:38 +0000

By one metric, this year’s biggest physics news happened 80 years ago. Yet while the success of a movie about the making of the atomic bomb was a surprise, the discoveries coming out of actual physics laboratories — including the grandest laboratory of them all, the universe itself — were no less impressive than the surge in interest about J. Robert Oppenheimer. The James Webb Space Telescope...

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Quantum Complexity Shows How to Escape Hawking’s Black Hole Paradox

Charlie Wood — Wed, 02 Aug 2023 14:51:35 +0000

Inside of a black hole, the two theoretical pillars of 20th-century physics appear to clash. Now a group of young physicists think they have resolved the conflict by appealing to the central pillar of the new century — the physics of quantum information.

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