Upconversion based receivers for quantum hacking resistant quantum key distribution

TL;DR

This paper introduces an upconversion-based receiver design for quantum key distribution that enhances security by preventing external control of the pump and enabling detection of hacking attempts.

Contribution

The proposed setup uses an internal pump for upconversion, making it resistant to hacking and allowing better control and monitoring of quantum measurements.

Findings

Pump is generated inside the receiver, preventing external access.

The setup can detect various quantum hacking attacks.

Enhanced security features for practical QKD systems.

Abstract

We propose a novel upconversion (sum frequency generation) based quantum-optical setup that can be employed as a receiver (Bob) in practical quantum key distribution systems. The pump governing the upconversion process is produced and utilized inside the physical receiver, making its access or control unrealistic for an external adversary (Eve). This pump facilitates several properties which permit Bob to define and control the modes that can participate in the quantum measurement. Furthermore, by manipulating and monitoring the characteristics of the pump pulses, Bob can detect a wide range of quantum hacking attacks launched by Eve.