Quantum computing stocks jumped again in morning trading on Wednesday. Arqit Quantum rose 15%; IonQ and D-Wave Quantum rose 10%; Sealsq and Quantum Computing rose 8%; Rigetti Computing rose 6%; Quantum Corporation rose 4%; MicroCloud Hologram rose 1%.

Quantum computing stocks were among the market's top gainers in Tuesday's trading session after Nvidia announced a quantum-focused AI advancement.

Nvidia unveiled Ising, an open-source family of AI models that leverages quantum computing technology to address processor calibration and error-correction issues.

"AI is essential to making quantum computing practical," Nvidia CEO Jensen Huang said, adding "With Ising, AI becomes the control plane — the operating system of quantum machines — transforming fragile qubits to scalable and reliable quantum-GPU systems."

"Quantum Processor Units (QPUs) are likely to become the next important co-processor in data centers, sitting alongside CPUs and GPUs," Berstein analysts told clients.

"CPUs will remain the workhorse for general-purpose computing, while GPUs dominate highly parallel workloads such as AI. QPUs, in turn, could become essential for a set of problems that are too complex or too costly for classical processors to solve efficiently," the analysts said.

They used an analogy to explain: QPUs can search a 100-million-page phone book all at once while CPUs go page by page.

The technology is in its early innings but is expected to revolutionize areas like medical research and energy efficiency, prompting interest from tech giants and governments. The space is a largely speculative trade for investors, given that real-world applications are still some time away.