• DOI:10.1364/OL.44.000275
• Corpus ID: 58623650

Interference between independent photonic integrated devices for quantum key distribution.

@article{Semenenko2019InterferenceBI,
  title={Interference between independent photonic integrated devices for quantum key distribution.},
  author={Henry Semenenko and Philip Sibson and Mark G. Thompson and Chris Erven},
  journal={Optics letters},
  year={2019},
  volume={44 2},
  pages={
          275-278
        }
}

• H. Semenenko, P. Sibson, +1 author C. Erven
• Published 15 January 2019
• Physics, Computer Science
• Optics letters

Advances in quantum computing are a rapidly growing threat towards modern cryptography. Quantum key distribution (QKD) provides long-term security without assuming the computational power of an adversary. However, inconsistencies between theory and experiment have raised questions in terms of real-world security, while large and power-hungry commercial systems have slowed wide-scale adoption. Measurement-device-independent QKD (MDI-QKD) provides a method of sharing secret keys that removes all possible detector side-channel attacks which drastically improves security claims. In this Letter, we experimentally demonstrate a key step required to perform MDI-QKD with scalable integrated devices. We show Hong-Ou-Mandel interference between weak coherent states carved from two independent indium phosphide transmitters at 431 MHz with a visibility of 46.5±0.8%. This Letter demonstrates the feasibility of using integrated devices to lower a major barrier towards the adoption of QKD in metropolitan networks.