D-Wave on rails: Company tests entanglement on its dual-rail qubits
摘要
D-Wave公司近日在《自然》期刊发表论文，验证了其双轨量子比特技术的关键步骤。该公司早期以量子退火机闻名，近年转向门控量子计算，并选择了通量量子比特技术。今年，D-Wave收购了源自耶鲁大学的初创公司Quantum Circuits，获得其双轨量子比特技术——该技术同样被亚马逊采用，其优势在于多数错误易于检测，可简化纠错过程。此次研究展示了两个双轨量子比特
D-Wave is a bit of an oddity in the quantum computing space, having been founded back in the last century. And its initial offering wasn't a quantum computer like those being developed by IBM or Google. Instead, the company built what's now called a quantum annealer, a machine that isn't general-purpose but can solve a large class of optimization problems. While the hardware shares some similarities with the qubits used in gate-based quantum computers, it operates in a fundamentally different way.
But a few years back, D-Wave started working on gate-based hardware, apparently choosing a somewhat unusual qubit technology called fluxonium. And this year, the company acquired a startup called Quantum Circuits that spun out of Yale and has been developing what's called a dual-rail qubit (the same technology used by Amazon), which promises to make most errors very easy to detect, simplifying error correction.
On Wednesday, the company is publishing a paper in Nature that describes a key step in validating this dual-rail technology, showing that two of the qubits can be entangled without altering their best feature: Most are a single type that is easy to detect.
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