Quantum adaptation of noisy channels

2008/11/13 by Miroslav Gavenda, Radim Filip
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1103/physreva.78.052322

published as Phys. Rev. A 78, 052322 (2008) · 6 pages, 4 figures

openalex publication_date 2008/11/13 · arxiv created 2009/05/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Probabilistic quantum filtering is proposed to properly adapt sequential independent quantum channels in order to stop sudden death of entanglement. In the adaptation, the quantum filtering does not distill or purify more entanglement, it rather properly prepares an entangled state to the subsequent quantum channel. In particular, the quantum adaptation probabilistically eliminates the sudden death of entanglement of a two-qubit entangled state with isotropic noise injected into separate amplitude damping channels. The result has an application in quantum key distribution through noisy channels.

Citations

• Qubit Entanglement Breaking Channels
• Entanglement of Formation of an Arbitrary State of Two Qubits
• Finite-Time Disentanglement Via Spontaneous Emission
• Separability Criterion for Density Matrices
• Quantum states with Einstein-Podolsky-Rosen correlations admitting a hidden-variable model
• Quantum Privacy Amplification and the Security of Quantum Cryptography over Noisy Channels
• Experimental Entanglement Distillation of Two-Qubit Mixed States under Local Operations