Entanglement versus mixedness for coupled qubits under a phase damping channel

2005/07/31 by E. S. Cardoso, M. C. de Oliveira, K. Furuya
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.72.042320

published as Phys. Rev. A 72, 042320 (2005) · 9 pages, 2 figures. Replaced with final published version

openalex publication_date 2005/10/20 · arxiv created 2006/02/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Quantification of entanglement against mixing is given for a system of coupled qubits under a phase damping channel. A family of pure initial joint states is defined, ranging from pure separable states to maximally entangled states. An ordering of entanglement measures is given for a well-defined initial-state amount of entanglement.

Citations

• Fidelity for Mixed Quantum States
• Two-Bit Gates are Universal for Quantum Computation
• Separability Criterion for Density Matrices
• Entanglement of a Pair of Quantum Bits
• Mixed-state sensitivity of several quantum-information benchmarks
• Quantifying Entanglement