Optimal dimensionality for quantum cryptography

Abstract

We perform a comparison of two protocols for generating a cryptographic key composed from d-valued symbols: one exploiting a string of independent qubits and another one utilizing d-level systems prepared in states belonging to d+1 mutually unbiased bases. We show that the protocol based on qubits is optimal for quantum cryptography, since it provides higher security and higher key generation rate.

Revtex, 4 pages, 1 eps figure

References in corpus (3)

• Quantum Cryptography
• Security of quantum key distribution using d-level systems
• Optimal eavesdropping in cryptography with three-dimensional quantum states

Cited by in corpus (3)

• Polarization ququarts
• Security of subcarrier wave quantum key distribution against the collective beam-splitting attack
• On Preparing Entangled Pairs of Polarization Qubits in the Frequency Non-Degenerate Regime