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Trapped Ion Quantum Computing

Detector Asymmetry in Continuous Variable Quantum Key Distribution

arXiv

Authors: Jennifer O Bartlett, Alfie J Myers Wilson, Christopher J Chunnilall, Rupesh Kumar

Year

2025

Paper ID

50996

Status

Preprint

Abstract Read

~2 min

Abstract Words

116

Citations

N/A

Abstract

In Local-local Oscillator (LLO) based Continuous-Variable Quantum Key Distribution (CV-QKD), the phase reference of the transmitter and receiver, Alice and Bob, are naturally de-correlated due to their use of individual lasers. A phase reference signal is used, whose measurement is critical for estimating the phase difference and correcting the raw QKD data. We observed that asymmetry in the quadrature measurements of the shot noise-limited heterodyne detector affects the accuracy of the reference signal's phase estimation and thereby reduces the achievable transmission distance and key rate of the CV-QKD system. We quantify the effect and propose a method to counteract the effect of detection asymmetry. We also evaluate the effects of detection asymmetry using quantum optical tomography.

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This paper contributes to the Trapped-Ion Quantum Computing research area in the Quantum Articles archive.
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In Local-local Oscillator (LLO) based Continuous-Variable Quantum Key Distribution (CV-QKD), the phase reference of the transmitter and receiver, Alice and Bob, are naturally...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2510.17419 [2] arXiv https://arxiv.org/abs/2510.17419 [3] Publisher https://arxiv.org/abs/2510.17419

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