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quantum computing

cryptography

Cryptographers Achieve Perfect Secrecy With Imperfect Devices

By Mordechai Rorvig
February 25, 2022
Read Later

For the first time, experiments demonstrate the possibility of sharing secrets with perfect privacy — even when the devices used to share them cannot be trusted.

Photo of an array of metal tubes and glass pieces, with an orange laser cutting horizontally across
machine learning

Machine Learning Gets a Quantum Speedup

By Max G. Levy
February 4, 2022
Read Later

Two teams have shown how quantum approaches can solve problems faster than classical computers, bringing physics and computer science closer together.

An illustration of a locomotive pulling train cars, with math symbols piled in the caboose.
computational complexity

Computer Scientists Eliminate Pesky Quantum Computations

By Nick Thieme
January 19, 2022
Read Later

For years, intermediate measurements made it hard to quantify the complexity of quantum algorithms. New work establishes that those measurements aren’t necessary after all.

Blurry figures representing quantum officers are arranged in a grid against a black background.
mathematical physics

Euler’s 243-Year-Old ‘Impossible’ Puzzle Gets a Quantum Solution

By Daniel Garisto
January 10, 2022
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A surprising new solution to Leonhard Euler’s famous “36 officers puzzle” offers a novel way of encoding quantum information.

Illustration of two interweaving chains, one blue and one orange, against a blue background.
information theory

Qubits Can Be as Safe as Bits, Researchers Show

By Mordechai Rorvig
January 6, 2022
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A new result shows that quantum information can theoretically be protected from errors just as well as classical information can.

2021 in Review

The Year in Physics

By Michael Moyer
December 22, 2021
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Puzzling particles, quirky (and controversial) quantum computers, and one of the most ambitious science experiments in history marked the year’s milestones.

A Kagome lattice with atomic spin arrows placed on the edges.
quantum physics

Quantum Simulators Create a Totally New Phase of Matter

By Charlie Wood
December 2, 2021
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One of the first goals of quantum computing has been to recreate bizarre quantum systems that can’t be studied in an ordinary computer. A dark-horse quantum simulator has now done just that.

Orange spheres representing quantum bits.
explainers

How Quantum Computers Will Correct Their Errors

By Katie McCormick
November 16, 2021
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Quantum bits are fussy and fragile. Useful quantum computers will need to use an error-correction technique like the one that was recently demonstrated on a real machine.

A video of masks swirling around.
quantum computing

Major Quantum Computing Strategy Suffers Serious Setbacks

By Philip Ball
September 29, 2021
Read Later

So-called topological quantum computing would avoid many of the problems that stand in the way of full-scale quantum computers. But high-profile missteps have led some experts to question whether the field is fooling itself.


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