Negative entanglement measure, and what it implies

2007/03/10 by Ting Yu, J. H. Eberly
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum many-body systems #quant-ph

paper · pdf · doi:10.1080/09500340701432581

published as J. Mod. Opt. 54, 2289-2296 (2007) · 4 pages, 5 figures, submitted to Special Issue in Journal of Modern Optics in honor of Peter Knight

arxiv created 2007/03/10 · openalex publication_date 2007/09/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29

Abstract

In this paper, we extract from concurrence its variable part, denoted Λ, a function of density matrix ρ, either positive or negative. We use it to investigate entanglement dynamics of two isolated but initially entangled qubits, each coupled to its own environment. In particular, we show that it can signal whether the disentanglement of an entangled state occurs in a finite time.

Citations

• Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?
• Phonon decoherence of quantum entanglement: Robust and fragile states
• Entanglement of Formation of an Arbitrary State of Two Qubits
• Disentanglement and decoherence by open system dynamics
• Finite-Time Disentanglement Via Spontaneous Emission
• Quantum states with Einstein-Podolsky-Rosen correlations admitting a hidden-variable model