Phonon decoherence of quantum entanglement: Robust and fragile states

2002/09/04 by T. Yu, Ting Yu, J. H. Eberly · 8 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1103/physrevb.66.193306

published as Phys. Rev. B, 66 (2002) 193306 · 11 pages, revtex, no figures

arxiv created 2002/09/04 · openalex publication_date 2002/11/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We study the robustness and fragility of entanglement of open quantum systems in some exactly solvable models in which the decoherence is caused by a pure dephasing process. In particular, for the toy models presented in this paper, we identify two different time scales, one is responsible for local dephasing, while the other is for entanglement decay. For a class of fragile entangled states defined in this paper, we find that the entanglement of two qubits, as measured by concurrence, decays faster asymptotically than the quantum dephasing of an individual qubit.

Citations

• Non-Markovian Quantum State Diffusion
• Entanglement of Formation of an Arbitrary State of Two Qubits

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