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Related Experiment Video

Updated: Aug 9, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Quantum bit error rate timing jitter dependency on multi-mode fibers.

Alexandra Lee, Alfonso Tello Castillo, Craig Whitehill

|February 24, 2023

Summary

This summary is machine-generated.

Time-jitter in single-photon detectors significantly impacts quantum key distribution (QKD) error rates. Graded-index multimode fibers offer a solution, minimizing quantum bit error rate (QBER) increases in free-space QKD systems.

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Last Updated: Aug 9, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Published on: April 4, 2017

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Published on: March 20, 2017

Area of Science:

Quantum Information Science
Optical Communications
Photonics

Background:

Time-jitter from single-photon detectors is a key factor in quantum bit error rate (QBER) for high-rate quantum key distribution (QKD).
Previous research focused on single-mode fibers, leaving the impact of multimode fibers on QBER under-explored, despite their use in free-space QKD systems.

Purpose of the Study:

To investigate the effect of multimode fiber coupling on the time-jitter contribution to QBER in QKD.
To evaluate the performance of different multimode fiber types (step-index vs. graded-index) in free-space QKD receivers.

Main Methods:

Coupling a silicon single-photon avalanche diode with various multimode fibers.
Simulating a 1 GHz operating frequency with empirical measurements at 1 MHz repetition rate.
Analyzing the time-jitter contribution to QBER for each fiber type.

Main Results:

Step-index multimode fibers were found to significantly increase the QBER.
Graded-index multimode fibers demonstrated a QBER contribution comparable to single-mode fibers.
The study quantified the impact of fiber type on QKD performance.

Conclusions:

Graded-index multimode fibers are highly beneficial for free-space QKD receivers, especially at high repetition rates.
The choice of multimode fiber significantly influences the overall QBER in QKD systems.
This research provides crucial insights for optimizing free-space QKD receiver design.