Using Cascade in Quantum Key Distribution
arXiv:2307.00576 · doi:10.1103/PhysRevApplied.20.064040
Abstract
We point out a critical flaw in the analysis of Quantum Key Distribution (QKD) protocols that employ the two-way error correction protocol Cascade. Specifically, this flaw stems from an incom-plete consideration of all two-way communication that occurs during the Cascade protocol. We present a straightforward and elegant alternative approach that addresses this flaw and produces valid key rates. We exemplify our new approach by comparing its key rates with those generated using older, incorrect approaches, for Qubit BB84 and Decoy-State BB84 protocols. We show that in many practically relevant situations, our rectified approach produces the same key rate as older, incorrect approaches. However, in other scenarios, our approach produces valid key rates that are lower, highlighting the importance of properly accounting for all two-way communication during Cascade.
References in corpus (28)
- Mixed State Entanglement and Quantum Error Correction
- Quantum cryptography: Public key distribution and coin tossing
- The Security of Practical Quantum Key Distribution
- Decoy State Quantum Key Distribution
- Quantum Key Distribution with High Loss: Toward Global Secure Communication
- Secure quantum key distribution with realistic devices
- Beating the PNS attack in practical quantum cryptography
- Practical Decoy State for Quantum Key Distribution
- Distillation of secret key and entanglement from quantum states
- Optimal eavesdropping in quantum cryptography with six states
- Quantum key distribution over 122 km of standard telecom fiber
- Concise Security Bounds for Practical Decoy-State Quantum Key Distribution
- Quantum cryptography with finite resources: unconditional security bound for discrete-variable protocols with one-way post-processing
- Post-selection technique for quantum channels with applications to quantum cryptography
- Entanglement as precondition for secure quantum key distribution
- Quantum key distribution with realistic states: photon-number statistics in the photon-number splitting attack
- Finite-key analysis on the 1-decoy state QKD protocol
- A largely self-contained and complete security proof for quantum key distribution
- Reliable numerical key rates for quantum key distribution
- Asymptotic security analysis of discrete-modulated continuous-variable quantum key distribution
- Efficient reconciliation protocol for discrete-variable quantum key distribution
- Entangled Quantum Key Distribution Over Two Free-Space Optical Links
- Symmetries in Quantum Key Distribution and the Connection between Optimal Attacks and Optimal Cloning
- Numerical Calculations of Finite Key Rate for General Quantum Key Distribution Protocols
- Squashing model for detectors and applications to quantum key distribution protocols
- Key rate of quantum key distribution with hashed two-way classical communication
- Continuous variable quantum key distribution based on optical entangled states without signal modulation
- Improving key rates of the unbalanced phase-encoded BB84 protocol using the flag-state squashing model
Cited by in corpus (4)
- Efficient Information Reconciliation for High-Dimensional Quantum Key Distribution
- Harnessing high-dimensional temporal entanglement using limited interferometric setups
- Quantum Key Distribution with Imperfections: Recent Advances in Security Proofs
- Security proofs for practical QKD: variations, techniques, gaps, and limitations