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A quantum leap: Researchers create super-secure computer network. Seungjai Min Hansang Bae Hwanjo Heo. Quantum Cryptography?. Uses light particles, photons through optical fiber instead of electric waves on wire
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A quantum leap: Researchers create super-secure computer network Seungjai Min Hansang Bae Hwanjo Heo
Quantum Cryptography? • Uses light particles, photons through optical fiber instead of electric waves on wire • A defining discovery in physics: that subatomic particles can exist in multiple states at once until something interacts with them. • Eavesdropping on the photons, such as setting up a photo detector to read the code, makes the codes unusable and can be detected.
Quantum Key Distribution • Core aspect of quantum networking • Two parties share a key obtained by QKD before data communication • Separated in two channels: quantum channel and public channel • Uses different polarization of a photon to encode a bit • Example protocols: BB84, B92
Working Examples • The Boston network(BBN – Havard – Boston university) is the first internet-integrated system. • A group in Europe recently made the first quantum encrypted bank transaction. • MagiQ Technologies and id Quantique are selling commercial QKD systems.
Pros & Cons • Nearly Impossible to steal, even with a super-powered computer • Detect if someone is listening • “Secure” – randomness, no cloning • Distance Limitations • Availability • Expensive (MagiQ sells it at $50,000 per piece) • Vulnerable to DOS • Keys can’t keep up with data transmission
