# Quantum key distribution protocol with pseudorandom bases

## TL;DR

This paper introduces a new prepare-and-measure QKD protocol that uses pseudorandom bases, showing improved secret key rates over BB84 with single-photon sources, but requiring high-quality single-photon sources.

## Contribution

The paper proposes a novel QKD protocol utilizing pseudorandomness in quantum state preparation, enhancing key rates compared to traditional protocols.

## Key findings

- Better secret key rates than BB84 with single-photon sources
- Security against intercept-resend attack demonstrated
- Requires high-quality single-photon sources

## Abstract

Quantum key distribution (QKD) offers a way for establishing information-theoretically secure communications. An important part of QKD technology is a high-quality random number generator (RNG) for quantum states preparation and for post-processing procedures. In the present work, we consider a novel class of prepare-and-measure QKD protocols, utilizing additional pseudorandomness in the preparation of quantum states. We study one of such protocols and analyze its security against the intercept-resend attack. We demonstrate that, for single-photon sources, the considered protocol gives better secret key rates than the BB84 and the asymmetric BB84 protocol. However, the protocol strongly requires single-photon sources.