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Related Concept Videos

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Secure Quantum Ranging.

Yunkai Wang1,2,3, Graeme Smith2,3, Alex May1,2

  • 1Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada.

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|January 20, 2026
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Summary
This summary is machine-generated.

This study introduces a secure quantum ranging protocol for precise object positioning and verification. It combines quantum ranging with quantum position verification (QPV) to detect cheaters and achieve Heisenberg-limited precision.

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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Cryptography

Background:

  • Accurate object positioning is crucial for numerous applications.
  • Existing quantum ranging methods lack robust security and position verification.
  • Quantum position verification (QPV) has been theoretically proposed but lacks practical frameworks.

Purpose of the Study:

  • To develop a secure quantum ranging protocol.
  • To integrate quantum ranging with quantum position verification (QPV).
  • To achieve Heisenberg-limited precision in position estimation while detecting malicious actors.

Main Methods:

  • A novel protocol combining quantum ranging and QPV is proposed.
  • Two verifiers send frequency-entangled states in a single optical mode.
  • An honest prover uses simple beam-splitter operations; cheaters face limitations.

Main Results:

  • The protocol achieves Heisenberg-limited precision in position estimation.
  • It simultaneously detects potential cheaters in the quantum ranging process.
  • A framework is provided to quantify position verification precision in QPV.

Conclusions:

  • The proposed scheme enhances security in quantum ranging.
  • It addresses a previously unstudied security aspect of quantum ranging.
  • Near-term experimental implementation using photonic technologies is feasible for a better-than-classical advantage.