Quantum Key Distribution and the Uncertainty Principle
2025-10-07
Quantum Key Distribution and the Uncertainty Principle, 4 pages.
Abstract
An attacker who intercepts qubits can break certain classes of quantum key distribution protocols. The idea is to record classical bits for outcomes in each of the small set of allowed measurement bases, for each qubit sent during the key exchange, using a sequence of simple quantum circuits. That approach also seems to enable predicting the future results of non-commuting measurements, which the uncertainty principle forbids.