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Continuous-variable protocol for oblivious transfer in the noisy-storage model.

Fabian Furrer1,2, Tobias Gehring3, Christian Schaffner4,5

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan.

Nature Communications
|April 15, 2018
PubMed
Summary
This summary is machine-generated.

We demonstrate a quantum oblivious transfer protocol for continuous-variable systems, proving its security in a noisy-storage model. This enables secure two-party quantum cryptography over optical networks.

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Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Optical Communication Systems

Background:

  • Cryptographic protocols are essential for secure communication.
  • Two-party protocols protect against untrustworthy participants.
  • Oblivious transfer is a fundamental primitive for secure two-party protocols.

Purpose of the Study:

  • To present and experimentally demonstrate a quantum oblivious transfer protocol.
  • To prove the security of this protocol in the noisy-storage model.
  • To enable arbitrary two-party quantum cryptographic protocols using continuous-variable systems.

Main Methods:

  • Development of a quantum oblivious transfer protocol for optical continuous-variable systems.
  • Security proof based on novel uncertainty relations for continuous-variable systems.
  • Experimental demonstration using entangled two-mode squeezed states and balanced homodyne detection.

Main Results:

  • Successful experimental demonstration of the quantum oblivious transfer protocol.
  • Validation of security within the noisy-storage model, accounting for channel losses.
  • Derivation of new uncertainty relations applicable to continuous-variable quantum systems.

Conclusions:

  • The proposed quantum oblivious transfer protocol is experimentally feasible.
  • This work advances the implementation of secure two-party quantum cryptography.
  • Continuous-variable quantum systems can support advanced cryptographic functionalities.