• NIST has developed a chip that reliably emits a single photon on demand. • This ability will improve the efficiency of QKD (quantum key distribution) as we prepare for the arrival of quantum computers.Quantum computers will upend current cryptology by usingShor’s algorithmto rapidly negate the current public/private key secure encryption methods. • This has largely been solved by NIST’s post quantum cryptology (PQC) algorithms.Knowledge of this future is driving the ‘harvest now, decrypt later’ spate of data exfiltration - companies may not even know their encrypted data has been stolen. • But adversaries, including, if not primarily, nation state adversaries, are storing that data knowing they will be able to decrypt it in the future; and who knows how many vital secrets may be within it?The arrival of quantum computing is future, but the threat is current. • Commercial and federal organizations need to protect against quantum computing decryption now.Various new mathematical approaches have been developed for PQC, but while they may be theoretically secure, they are not provably secure (what can be made by math can be unmade by math given enough compute power, and what is sent over traditional channels can be silently intercepted).Ultimately, the only provably secure key distribution must be based on physics rather than math. • A physics solution based on photons could rely on quantum principles - for example, you can know a quantum particle exists but not simultaneously where it is.

Article Summaries:

  • NIST has created a chip that can reliably emit a single photon on demand, a key advance for quantum key distribution (QKD). The device uses quantum‑dot emitters triggered by shaped laser pulses, producing photons with near‑perfect efficiency and precise timing-unlike current faint‑laser sources that emit randomly. This improvement could make QKD more practical and cost‑effective, addressing the current threat posed by quantum computers that can break conventional public‑key cryptography. While post‑quantum algorithms are being standardized, they lack provable security; physics‑based QKD offers that guarantee, though it remains expensive and limited to ~50‑60 miles without amplifiers. NIST’s chip represents a significant step toward scalable, secure quantum communications.

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