Quantum Cryptography: From Theory to Practice
summary
Describes turning theory into experiments: adapts QKD hardware (lasers, fibers, single-photon detectors) to implement a loss-tolerant coin flipping protocol that tolerates Poissonian multi-photon pulses via decoy-state style analysis, models detector dark counts and efficiency asymmetry, and removes need for quantum memory by immediate measurement. Reports a demonstrated quantum advantage out to 15 kilometers using modified off‑the‑shelf QKD gear, and catalogs practical attacks (detector blinding) and fixes integrated into the security proof.
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chapters (12)
- 0:00Start
- 6:41Two-party secure communications: QKD
- 16:15Two-party secure communications: beyond QKD
- 19:18Adapting theory to implementation
- 23:09Ambainis protocol
- 26:02First step: achieving loss tolerance
- 30:41Vulnerability to noise and multi-photon pulses
- 31:15Second step: taking into account imperfections
- 31:46Experimental implementation
- 31:57Security of the implementation
- 32:37Third step: satisfying the security assumptions
- 33:16Showing quantum advantage in practice
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