Breaking The One-Third Bit Error Rate Barrier Of Quantum Key Distribution

To push up the error tolerance rate of quantum key distribution, I propose a prepare-and-measure quantum key distribution scheme using N -dimensional quantum particles as information carriers where N is a prime power. Remarkably, this prepare-and-measure scheme can distribute a provably secure key against all attacks allowed by the laws of quantum physics for at least one-third bit error rate whenever N is even and N ≥ 16. Since one-third bit error rate is the maximum limit for any qubit-based key distribution scheme to handle securely, the scheme reported here demonstrates the advantage of using high dimensional quantum particles as information carriers at high eavesdropping rate.