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Deterministic entanglement distillation for secure double-server blind quantum computation.

Yu-Bo Sheng1, Lan Zhou2

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This study introduces a deterministic entanglement distillation protocol for double-server blind quantum computation (BQC). It enables a pure Bell state for clients with classical devices, ensuring unconditional security and 100% success probability.

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Area of Science:

  • Quantum Information Science
  • Quantum Computation Security

Background:

  • Blind quantum computation (BQC) enables universal quantum computation for clients with limited resources.
  • The double-server BQC protocol requires a shared pure Bell state between two servers, with the client using only classical devices.
  • Existing protocols face challenges in noisy environments and achieving high success rates for Bell state generation.

Purpose of the Study:

  • To develop a deterministic entanglement distillation protocol for the double-server BQC.
  • To generate a pure maximally entangled Bell state suitable for BQC in a noisy environment.
  • To ensure unconditional security and high fidelity for the BQC protocol.

Main Methods:

  • A novel deterministic entanglement distillation protocol is proposed.
  • The protocol operates in a practical noisy quantum environment.
  • It focuses on purifying a shared state into a maximally entangled Bell state.

Main Results:

  • The protocol deterministically produces a pure maximally entangled Bell state.
  • The success probability of the distillation process reaches 100% in principle.
  • The distilled states are directly usable for subsequent blind quantum computation.

Conclusions:

  • The developed protocol enhances the feasibility of double-server BQC by providing a reliable source of pure Bell states.
  • It offers unconditional security as no classical information is exchanged and parties remain ignorant of the client's computation.
  • This work paves the way for more practical and secure blind quantum computation implementations.