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Quantum Crypto Crams into System-on-a-Chip

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A Toshiba scientist examines a quantum key distribution chip under the microscope.

Toshiba anticipates the market for quantum key distribution will grow to $20 billion worldwide by 2035.

Credit: Toshiba Europe Ltd.

Toshiba researchers have developed a secure quantum communication system that combines quantum transmitter and receiver microchips with a chip-based quantum random number generator operating at a rate of 4 billion bits per second.

Toshiba's Taofiq Paraïso said that in experiments, "the system was shown to operate over metropolitan fiber lengths and sustain high performance over several days without the need of any user intervention."

At distances of 10 kilometers, researchers achieved key generation rates of about 470,000 bits per second over roughly five days, enough to secure video calls.

The researchers showed they could assemble their system into compact 1U rackmount cases, the kind seen in servers, and that they could interface their system with an industrial-grade encryptor, allowing secure data transfers at up to 100 billion bits per second.

From IEEE Spectrum
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