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Updated: Jul 15, 2025
00:07
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Insecurity of Quantum Blockchains Based on Entanglement in Time
1Department of Telecommunications and Teleinformatics, Silesian University of Technology, Akademicka 16, 44-100 Gliwice, Poland.
Entropy (Basel, Switzerland)
|September 28, 2023
Summary
This study challenges the security of quantum blockchains by showing that entanglement in time is not present. Experiments confirm that qubits are not entangled, undermining the proposed quantum data structure security.
Area of Science:
- Quantum Computing
- Blockchain Technology
- Quantum Information Science
Background:
- Quantum blockchain concepts propose using quantum phenomena for enhanced security.
- Entanglement in time has been suggested as a basis for these quantum blockchain data structures.
- The security of such structures relies on the verifiable existence of quantum entanglement.
Purpose of the Study:
- To investigate the security implications of using entanglement in time for quantum blockchain data structures.
- To critically analyze the interpretation of experimental results supporting quantum blockchain security claims.
- To provide an alternative interpretation based on established quantum mechanics principles.
Main Methods:
- Theoretical analysis of quantum blockchain security models.
- Numerical simulations to model quantum correlations.
- Experimental validation using real quantum hardware.
- Implementation of a dedicated circuit for genuine entanglement detection.
Main Results:
- The study found that the proposed quantum blockchain representation relies on an uncertain interpretation of experimental results.
- The Copenhagen interpretation explains observed correlations without invoking entanglement in time.
- Experiments conclusively excluded the existence of genuine entanglement in the quantum blockchain generation process.
Conclusions:
- The security foundation of quantum blockchains, as proposed, is challenged by the absence of entanglement in time.
- The qubits utilized in the described quantum blockchain are not entangled, contrary to initial assumptions.
- This research necessitates a re-evaluation of quantum-enhanced blockchain security models.
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