Key rate for calibration robust entanglement based BB84 quantum key distribution protocol

TL;DR

This paper demonstrates that the key rate formula for entanglement-based BB84 quantum key distribution remains valid under minimal assumptions, specifically only requiring one party to measure a qubit, simplifying security verification.

Contribution

It introduces a dimension-based entanglement verification approach that simplifies security assumptions for the entanglement-based BB84 protocol.

Findings

Key rate formula holds with minimal assumptions

Verification based solely on system dimension

No need for detailed measurement assumptions

Abstract

We apply the approach of verifying entanglement, which is based on the sole knowledge of the dimension of the underlying physical system to the entanglement based version of the BB84 quantum key distribution protocol. We show that the familiar one-way key rate formula holds already if one assumes the assumption that one of the parties is measuring a qubit and no further assumptions about the measurement are needed.