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Category: quantum physics – Page 38

Researchers demonstrate error-resistant quantum gates using exotic anyons for computation

The quantum computing revolution draws ever nearer, but the need for a computer that makes correctable errors continues to hold it back.

Through a collaboration with IBM led by Cornell, researchers have brought that revolution one step closer, achieving two major breakthroughs. First, they demonstrated an error-resistant implementation of universal quantum gates, the essential building blocks of quantum computation. Second, they showcased the power of a topological quantum computer in solving hard problems that a conventional computer couldn’t manage.

In the article “Realizing String-Net Condensation: Fibonacci Anyon Braiding for Universal Gates and Sampling Chromatic Polynomials” published in Nature Communications, an between researchers at IBM, Cornell, Harvard University and the Weizman Institute of Science demonstrated, for the first time, the ability to encode information by braiding—moving in a particular order—Fibonacci string net condensate (Fib SNC) anyons, which are exotic quasi-particles, in two dimensional space.

Researchers certify genuine quantum behavior in computers with up to 73 qubits

Can you prove whether a large quantum system truly behaves according to the weird and wonderful rules of quantum mechanics—or if it just looks like it does? In a new study, physicists from Leiden, Beijing and Hangzhou found the answer to this question.

You could call it a “quantum lie detector”: Bell’s test designed by famous physicist John Bell. This test shows whether a machine, like a quantum computer, is truly using or just mimics them.

As quantum technologies become more mature, ever more stringent tests of quantumness become necessary. In this new study, the researchers took things to the next level, testing Bell correlations in systems with up to 73 qubits—the basic building blocks of a quantum computer.

New technique using Raman scattering can dramatically improve laser linewidth for better quantum computing

Macquarie University researchers have demonstrated a technique to dramatically narrow the linewidth of a laser beam by a factor of over ten thousand—a discovery that could revolutionize quantum computing, atomic clocks and gravitational wave detection.

In research published in APL Photonics, the team described using diamond crystals and the Raman effect—where laser light stimulates vibrations in materials and then scatters off those vibrations—to narrow the linewidth of laser beams by factors exceeding 10,000.

Laser linewidth measures how precisely a beam of light maintains its frequency and color purity. The narrower the linewidth, the more monochromatic and spectrally pure the laser. The team’s theoretical predictions suggest even greater improvements are possible with the method they have developed.

First electronic–photonic quantum chip created in commercial foundry

In a milestone for scalable quantum technologies, scientists from Boston University, UC Berkeley, and Northwestern University have reported the world’s first electronic–photonic–quantum system on a chip, according to a study published in Nature Electronics.

Twist To the M-ax(is): New Twist Platform Opens Path to Quantum Simulation of More Exotic States of Matter

Researchers introduce a new class of twistable materials, unlocking unprecedented quantum possibilities. Twisted materials—known as moiré structures—have revolutionized modern physics, emerging as today’s “alchemy” by creating entirely new phases of matter through simple geometric manipulation. The term “moiré” may sound familiar—it describes the st

Energy–speed relationship of quantum particles challenges Bohmian mechanics

The study of the relationship between particle speed and negative kinetic energy, arising in regions in which, according to classical mechanics, particles are not allowed to enter, reveals behaviour that appears to contradict the predictions of Bohmian mechanics.

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