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Related Experiment Video

Updated: May 16, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Efficient single-spatial-mode periodically-poled KTiOPO4 waveguide source for high-dimensional entanglement-based

Tian Zhong1, Franco N C Wong, Alessandro Restelli

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. tzhong@mit.edu

Optics Express
|November 29, 2012
PubMed
Summary

We generated high-purity photon pairs for quantum key distribution using a periodically-poled KTiOPO4 waveguide. This method achieved high efficiency and visibility, enabling secure communication.

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Last Updated: May 16, 2026

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Area of Science:

  • Quantum optics
  • Photonics

Background:

  • Quantum key distribution (QKD) requires high-quality photon sources.
  • Entanglement-based QKD offers enhanced security but demands precise photon pair generation.

Purpose of the Study:

  • To demonstrate a high-purity, single-spatial-mode photon pair source at 1560 nm.
  • To evaluate the source's suitability for high-dimensional time-energy entanglement-based QKD.

Main Methods:

  • Utilized a periodically-poled KTiOPO4 (PPKTP) waveguide for spontaneous parametric down-conversion.
  • Employed nearly lossless spectral filtering and high-count-rate InGaAs single-photon avalanche photodiodes with advanced gating techniques.

Main Results:

  • Achieved high-purity photon pairs in a single spatial mode with 80% fiber coupling efficiency.
  • Generated raw key rates exceeding 1 Mbit/s with 3 bits-per-photon encoding.
  • Demonstrated a record 98.2% Franson quantum-interference visibility without coincidence subtraction.

Conclusions:

  • The PPKTP waveguide source is highly efficient and suitable for QKD.
  • The achieved results advance the practical implementation of high-dimensional entanglement-based QKD.