Design of Voltage Pulse Control Module for Free Space Measurement-Device-Independent Quantum Key Distribution

TL;DR

This paper presents the design of a Voltage Pulse Control Module to facilitate free space measurement-device-independent quantum key distribution, aiming to reduce signal attenuation over longer distances compared to fiber channels.

Contribution

It introduces a specialized voltage pulse control module tailored for free space MDIQKD, addressing the modulation needs for wide pulse chopping, decoy states, and phase/time encoding.

Findings

Effective reduction of signal attenuation over distance

Successful implementation of free space MDIQKD modulation techniques

Enhanced security and transmission range for quantum key distribution

Abstract

Measurement-Device-Independent Quantum Key Distribution (MDIQKD) protocol has been proved that it is unaffected by all hacking attacks, and ensures the security of information theory even when the performance of single-photon detectors is not ideal. Fiber channel has been used by the previous MDIQKD experimental device. However, the signal attenuation increases exponentially as the transmission distance increases. In order to overcome this, we regard free space as the channel of signal transmission, and the signal attenuation increases square as the transmission distance increases (regardless of the atmospheric scattering), which can effectively reduce the signal attenuation trend. In order to implement the free space MDIQKD experiments, a modulation module is needed to modulate the wide pulse chopping, decoy-state, normalization, phase encoding and time encoding. In this paper, we present the design of the Voltage Pulse Control Module for the free space MDIQKD.