RQC Seminar

254th RQC Seminar

• Speaker

  Prof. En-Jui Kuo
  ( National Yang Ming Chiao Tung University, Taiwan )

• Date

  11:00-12:00, Friday, March 13, 2026

• Venue

  Hybrid( Zoom,
  Large Meeting Room, 2F, Welfare and Conference Building, Wako Campus / 和光地区 統合支援施設2階 大会議室 (C61))

• Title

  Device-Independent Quantum Rigidity for Secure Global Positioning

• Inquiries

  yasunobu.nakamura[at]riken.jp

Abstract
Device-independent (DI) protocols provide the strongest form of security by removing trust assumptions on quantum devices and relying solely on observed nonlocal correlations and quantum rigidity. In this talk, I will discuss how multipartite Bell nonlocality and self-testing can be leveraged to secure distributed positioning tasks, using a quantum-secured global positioning system (GPS) as a concrete case study.
We consider a protocol based on a five-qubit entangled state shared among four satellites and one ground station, where correct state preparation and measurement behavior are certified solely from Bell inequality violations. I will explain how rigidity guarantees enable device-independent authentication against spoofing and cyberattacks, and discuss practical considerations in the NISQ era, including implementation trade-offs between superconducting and trapped-ion platforms, as well as constraints arising from long-distance photonic distribution.

Reference:
Kam, CF., Kuo, EJ. Quantum-secured device-independent global positioning system. EPJ Quantum Technol. (2026). https://doi.org/10.1140/epjqt/s40507-026-00470