China's Palm-Sized Quantum Device Secures 6M Users

In 2009, Tang Shibiao stepped into uncharted territory when he began working to make quantum technology practical for everyday use in China. Seventeen years of persistence just paid off in a big way.

Tang and his team at QuantumCTek in Hefei have created a palm-sized quantum communication device that's revolutionizing how we keep information safe. The breakthrough technology is already protecting phone calls, file transfers, and sensitive data for more than six million users across China's communications, financial, and power sectors.

Think of it as an unbreakable envelope for your digital messages. Quantum communication creates encryption keys using the laws of physics, making any attempted hack instantly detectable by both sender and receiver.

The journey wasn't easy. At the start, Tang's team faced a critical problem: the single-photon detectors needed for quantum communication had to be imported, were expensive, arrived slowly, and often didn't work well. "It's like catching a specific raindrop in a storm," the 44-year-old engineer explained about detecting single photons.

Without mastering this core technology, Tang knew their industrial expansion would hit a dead end. So his team spent years collaborating with research institutions and industry partners to build their own detectors from scratch.

Early attempts were rough. "We'd press the power switch and the circuit component would burn out," Tang recalled. The team endured countless sleepless nights, poring over research and consulting experts with no domestic precedent to guide them.

But they kept going. "Since we were exploring uncharted territory globally, hesitation or shifting directions would have doomed the effort," Tang said. "Moving forward with persistence was our only path to success."

The breakthrough finally came after endless trials testing different materials and structures. By the end of 2025, the team had shrunk their quantum communication module to mobile phone size, reducing it by more than 100 times compared to their first version.

The Ripple Effect

The impact extends far beyond the device itself. China has now built over 12,000 kilometers of quantum-secure communication network connecting major cities including Beijing, Shanghai, Hefei, and Jinan. This infrastructure creates a foundation for secure communications that serves businesses, governments, and everyday citizens.

What started as one researcher entering a scientific "no man's land" has become a practical technology protecting millions of daily conversations. The Quantum Secured Call product brings military-grade security to regular phone users, making advanced physics work for ordinary life.

Tang's seventeen-year journey shows how persistence in solving hard problems creates technology that changes how we live.