China Reaches Single-Electron Quantum Flash Memory Milestone

In a landmark advance for semiconductor physics, researchers at Fudan University have achieved room-temperature single-electron non-volatile storage — a feat long considered theoretically impossible. The breakthrough, published in Science on July 17, pushes data storage to its ultimate physical limit: one electron representing one bit of information.

The Ultimate Storage Frontier

For decades, the semiconductor industry has pursued ever-denser memory technologies. But there is a fundamental limit: electrons are indivisible elementary particles, meaning the smallest possible unit of data storage is a single electron. Until now, however, the quantum effects that dominate at this scale made stable room-temperature operation seem unattainable.

A research team led by Professor Zhou Peng and Associate Professor Liu Chunsen at Fudan University’s State Key Laboratory of Integrated Chips and Systems has shattered that assumption. Their “Quantum Flash” (量子闪存) technology, detailed in Science, demonstrates a single injected electron producing a 0.5 Volt storage window at 27°C — stable, non-volatile, and commercially viable.

To put that in perspective: current DRAM requires approximately 200,000 electrons to store a single bit of information. This represents a 200,000-fold reduction in electron count per bit.

How They Did It

The team constructed a coplanar drain-channel-source structure called “Guiyi” (归壹 — “Return to One”) using two-dimensional semiconductor atomic-level thickness as a natural confinement layer. This design enabled, for the first time, clear observation of single-electron non-volatile storage behavior at room temperature.

Previous attempts, including a landmark 1997 Science paper on silicon-based single-electron storage, managed only a 55 mV signal that lasted just 5 seconds — and required cryogenic temperatures. The Fudan team’s 0.5V window represents nearly an order-of-magnitude improvement, achieved at everyday room temperature.

Professor Zhou Peng offered a vivid analogy, as reported by cnBeta: “Previously we needed to pack a ‘room’ with 200,000 people to sense that ‘someone is there.’ Now, because the device is extremely tiny and sensitive, even if just one person (one electron) enters, the overall potential of the room changes dramatically and is precisely captured.”

A New Theoretical Framework

Beyond the experimental achievement, the team introduced an entirely new theoretical mechanism: the “Density-of-States Scissors” (态密度剪刀). By constructing a dual-Dirac structure, they created a “zero density of states” region in energy space — effectively a region where electrons cannot exist — enabling precise manipulation of quantum states.

As Liu Chunsen explained, this allows researchers to “cut” specific quantum states out of existence in energy space, revealing a previously unobserved anomalous quantum storage behavior. The Science journal evaluation described the work as “promising, potentially high-impact, and highly anticipated in the fields of storage physics and nanodevice engineering,” according to Science and Technology Daily.

Completing the Trilogy

This achievement is the third pillar of a systematic technology chain built by the Zhou-Liu team:

1. “PoX” (破晓 — Dawn): Published in Nature in April 2025, this 400-picosecond non-volatile flash device solved the long-standing speed-versus-nonvolatility dilemma that had persisted since the floating-gate transistor’s invention in 1967.

2. “Guiyi” (归壹): The current breakthrough, solving the density problem by achieving single-electron storage at the physical limit.

3. “Changying” (长缨 — Long Tassel): A CMOS-compatible hybrid architecture prototype chip developed in late 2025, selected as one of China’s “Top 10 Scientific Advances of 2025.”

Implications for AI and Computing

The timing of this breakthrough is significant. Modern AI workloads face a “memory wall” — the widening gap between processor speed and memory access speed, where data movement consumes significantly more energy than computation itself.

Quantum Flash technology, combined with the team’s earlier speed and integration breakthroughs, points toward “unified memory” that is simultaneously fast, dense, and non-volatile. This could fundamentally change AI chip architecture by eliminating the data migration bottleneck between compute and storage.

As reported by Pandaily, the technology could enable mobile devices and servers to run larger local AI models with longer context memory while consuming significantly less power.

The Road to Commercialization

The team plans to formally establish a startup company in the second half of 2026, with the initial goal of completing chip verification based on existing semiconductor production line modifications. Professor Zhou told cnBeta that the target is product-level implementation within 1-3 years, initially focusing on AI industry customers.

Crucially, the technology leverages existing CMOS-compatible fabrication processes, potentially reducing manufacturing costs and accelerating adoption. The 2D semiconductor heterogeneous integration approach is notably less complex than traditional bulk silicon doping schemes.

What This Means for the Global Semiconductor Landscape

This breakthrough arrives amid ongoing restructuring of global semiconductor supply chains. It represents a potential “technology leapfrogging” (换道超车) opportunity in advanced memory — a domain where China has historically lagged behind industry leaders like Samsung, SK Hynix, and Micron.

The research was supported by China’s National Key R&D Program, the National Natural Science Foundation, and the Shanghai Basic Research Special Zone Program, reflecting the strategic priority placed on next-generation memory technology.

Looking Ahead

While the scientific achievement is undeniable, several questions remain. Can single-electron storage be reliably manufactured at scale with existing CMOS fabs? How will endurance, speed, and cost compare with emerging alternatives like MRAM and RRAM? And how will international memory manufacturers respond?

What is clear is that the Zhou-Liu team has completed a remarkable technology chain — from fundamental physics published in Science and Nature to a CMOS-compatible prototype chip — and is now moving toward commercialization. For an industry hungry for breakthroughs that can keep pace with AI’s insatiable demand for memory bandwidth, Quantum Flash could be exactly what the semiconductor world has been waiting for.