Small, room-temperature quantum computers that use light on the horizon after breakthrough, scientists say

Scientists say they’ve cracked a key challenge in scalable quantum hardware after generating an error-correcting, light-based qubit on a chip for the first time.

Scientists have demonstrated that a photonic qubit a quantum bit powered by a particle of light can detect and correct its own errors while running at room temperature. They say it is a foundational step toward scalable quantum processors.

In a new study published June 4 in the journal Nature, researchers at Canadian quantum computing startup Xanadu created a so-called "Gottesman–Kitaev–Preskill" (GKP) state directly on a silicon chip.

GKP states are a type of quantum state that spreads information across multiple photons in a pattern that enables small errors to be spotted and corrected. This means that each qubit is capable of correcting itself, without needing to be bundled into large arrays of redundant qubits a common requirement in today’s error-correction methods.

It marks the first time this type of error-resistant quantum state has been generated using a process compatible with conventional chip manufacturing, the scientists said.

The breakthrough suggests that error-correcting quantum states could be produced with the same tools used to manufacture conventional computer chips bringing reliable, room-temperature quantum hardware a step closer to reality.

Website: International Research Awards on High Energy Physics and Computational Science.

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