Advantage distillation in paired-state quantum key distribution
Original title: Advantage Distillation in Paired-State Quantum Key Distribution
A three-record parity filter cuts the leading independent-bit error term from e to e squared before reconciliation.
Researchers analyze advantage distillation for paired-state Loop-Back quantum key distribution between a fixed optical station and a portable terminal. Alice sends two polarization-encoded pulses; Bob filters them, and Alice infers his selections from the returned detection pattern. Consistent three-record blocks are selected with public parity checks. The step detects discrepancies by postselection and is meant to precede conventional reconciliation. A modular theorem bounds extra guessing advantage after syndrome disclosure, including quantum side information.
- The closing edge of a parity polygon is redundant for the same vertices.
- Any spanning tree of those vertices has the same acceptance set.
- Exact acceptance probabilities, residual-error laws, and retention rates are derived.
- A specified single-photon passive-tap channel yields a positive conditional entropy bound.
From the original article
1 min read at arxiv.orgWe investigate advantage distillation for paired-state Loop-Back quantum key distribution, with a fixed optical station serving a lightweight portable terminal. Alice prepares two polarization-encoded pulses, Bob selects and applies a polarization filter to each pulse, and Alice infers his selections from the returned detection pattern.
By Luis Adrián Lizama-Pérez · arxiv.org
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