Dark periods and revivals of entanglement in a two-qubit system

2006/04/08 by Z. Ficek, R. Tanas, R. Tanaś · 3 citations
Computer Science · Physics and Astronomy · #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Qubit #quant-ph

paper · pdf · doi:10.1103/physreva.74.024304

4 pages, 3 figures

arxiv created 2006/04/08 · openalex publication_date 2006/08/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In a recent paper Yu and Eberly [Phys. Rev. Lett. 93, 140404 (2004)] have shown that two initially entangled and afterward not interacting qubits can become completely disentangled in a finite time. We study transient entanglement between two qubits coupled collectively to a multimode vacuum field, assuming that the two-qubit system is initially prepared in an entangled state produced by the two-photon coherences, and find the unusual feature that the irreversible spontaneous decay can lead to a revival of the entanglement that has already been destroyed. The results show that this feature is independent of the coherent dipole-dipole interaction between the atoms but it depends critically on whether or not collective damping is present.

Citations

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Finite-Time Disentanglement Via Spontaneous Emission
• Entangling two atoms via spontaneous emission
• Cavity-loss-induced generation of entangled atoms

Cited by

• Entanglement dynamics of two-bipartite system under the influence of dissipative environments
• Squeezed vacuum reservoir effect for entanglement decay in the nonlinear quantum scissor system
• Sudden death of distillability in qutrit-qutrit systems
• Asymptotic Entanglement Sudden Death in Two Atoms with Dipole–Dipole and Ising Interactions Coupled to a Radiation Field at Non-Zero Detuning