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Related Experiment Video

Updated: May 11, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Experimental eavesdropping based on optimal quantum cloning.

Karol Bartkiewicz1, Karel Lemr, Antonín Cernoch

  • 1RCPTM, Joint Laboratory of Optics of Palacký University and Institute of Physics of Academy of Sciences of the Czech Republic, Faculty of Science, Palacký University 17. listopadu 12, 771 46 Olomouc, Czech Republic. bartkiewicz@jointlab.upol.cz

Physical Review Letters
|May 18, 2013
PubMed
Summary
This summary is machine-generated.

Quantum cryptography security is challenged by eavesdroppers using approximate quantum cloning. This study demonstrates such an attack on quantum key distribution protocols, showing it can be hidden within normal transmission noise.

Related Experiment Videos

Last Updated: May 11, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Optics

Background:

  • Quantum cryptography relies on the no-cloning theorem for security, where eavesdropping disturbs quantum states.
  • Real-world quantum systems tolerate some disturbance, creating vulnerabilities for sophisticated eavesdropping.
  • Approximate quantum cloning can disturb qubits below the detectable noise threshold.

Purpose of the Study:

  • To experimentally demonstrate symmetric individual eavesdropping on quantum key distribution (QKD) protocols.
  • To investigate the feasibility of eavesdropping using a photonic multifunctional quantum cloner.
  • To assess if such eavesdropping can be concealed within expected transmission losses.

Main Methods:

  • Utilized a recently developed photonic multifunctional quantum cloner to prepare two-level probes.
  • Performed approximate quantum cloning attacks on the Bennett and Brassard (BB84) QKD protocol.
  • Tested the eavesdropping strategy on the Renes (R04) trine-state spherical code protocol.

Main Results:

  • Successfully demonstrated symmetric individual eavesdropping on BB84 and R04 protocols.
  • The optimal cloning device achieved a high success rate in the eavesdropping attempt.
  • The demonstrated eavesdropping was effectively masked by typical transmission losses in the quantum channel.

Conclusions:

  • Experimental evidence confirms that approximate quantum cloning can enable eavesdropping on QKD systems.
  • The developed quantum cloner facilitates such attacks by operating below the legitimate users' noise tolerance.
  • This work highlights the need for enhanced security measures against advanced eavesdropping techniques in quantum cryptography and may spur research into quantum cloning applications.