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Hiding classical data in multipartite quantum states.

T Eggeling1, R F Werner

  • 1Institut für Mathematische Physik, TU Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig, Germany. t.eggeling@tu-bs.de

Physical Review Letters
|August 23, 2002
PubMed
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We developed a method to hide classical bits in quantum states, making them secure against local eavesdropping. This technique ensures data privacy even with limited quantum communication, offering robust classical bit hiding in quantum information science.

Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Communication Security

Background:

  • Classical bits are vulnerable to eavesdropping in quantum communication.
  • Existing quantum security protocols often rely on entanglement or complex communication patterns.

Purpose of the Study:

  • To present a general technique for securely hiding classical bits within multipartite quantum states.
  • To demonstrate the security of this method against local operations and classical communication (LOCC).

Main Methods:

  • Encoding a classical bit in the choice between two distinct density operators in multipartite quantum states.
  • Analyzing the security of the encoded bit under various quantum communication scenarios.

Main Results:

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  • The hidden classical bit is irretrievable by LOCC without quantum communication.
  • The scheme offers tunable security, allowing secure communication for chosen patterns while enabling recovery for others.
  • Entanglement is not required, as separable quantum states can be used for hiding.

Conclusions:

  • The proposed technique provides a flexible and secure method for classical bit hiding in quantum systems.
  • The security is robust even when limited quantum communication is permitted.
  • The method does not necessitate prior entanglement, simplifying its implementation.