quantum computing – Quanta Magazine

Computer Scientists Prove That Heat Destroys Quantum Entanglement

Ben Brubaker — Wed, 28 Aug 2024 14:09:05 +0000

Nearly a century ago, the physicist Erwin Schrödinger called attention to a quirk of the quantum world that has fascinated and vexed researchers ever since. When quantum particles such as atoms interact, they shed their individual identities in favor of a collective state that’s greater, and weirder, than the sum of its parts. This phenomenon is called entanglement. Researchers have a firm...

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Cryptographers Discover a New Foundation for Quantum Secrecy

Ben Brubaker — Mon, 03 Jun 2024 15:45:06 +0000

Say you want to send a private message, cast a secret vote or sign a document securely. If you do any of these tasks on a computer, you’re relying on encryption to keep your data safe. That encryption needs to withstand attacks from codebreakers with their own computers, so modern encryption methods rely on assumptions about what mathematical problems are hard for computers to solve.

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The Best Qubits for Quantum Computing Might Just Be Atoms

Philip Ball — Mon, 25 Mar 2024 14:55:21 +0000

At the end of last year, the tech giant IBM announced what might sound like a milestone in quantum computing: the first-ever chip, called the Condor, with more than 1,000 quantum bits, or qubits. Given that this was barely two years after the company unveiled the Eagle, the first chip with more than 100 qubits, it looked as though the field was racing forward. Making quantum computers that can...

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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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Physicists Finally Find a Problem That Only Quantum Computers Can Do

Lakshmi Chandrasekaran — Tue, 12 Mar 2024 14:07:59 +0000

Quantum computers are poised to become computational superpowers, but researchers have long sought a viable problem that confers a quantum advantage — something only a quantum computer can solve. Only then, they argue, will the technology finally be seen as essential. They’ve been looking for decades. “Part of the reason it’s challenging is because classical computers are pretty good at a lot of...

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