2006/08/29 by Daniel Cavalcanti, J. G. Oliveira Jr, J. G. G. de Oliveira +5 · 2 citations
Computer Science · Mathematics · Physics and Astronomy · #Law #Mathematics #Multipartite entanglement #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Quantum mechanics #Quantum teleportation #Qubit #Realization (probability) #Squashed entanglement #Unitary state #W state #quant-ph
paper · pdf · doi:10.1103/physreva.74.042328
published as Phys. Rev. A 74, 042328 (2006) · 11 pages, 6 figs. v2: references added, text and figures improved
arxiv created 2006/08/29 · openalex publication_date 2006/10/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the relation between energy and entanglement in an entanglement transfer problem. We first analyze the general setup of two entangled qubits (``a'' and ``b'') exchanging this entanglement with two other independent qubits (``A'' and ``B''). Qubit ``a'' (``b'') interacts with qubit ``A'' (``B'') via a spin-exchange-like unitary evolution. A physical realization of this scenario could be the problem of two-level atoms transferring entanglement to resonant cavities via independent Jaynes-Cummings interactions. We study the dynamics of entanglement and energy for the second pair of qubits (tracing out the originally entangled ones) and show that these quantities are closely related. For example, the allowed quantum states occupy a restricted area in a phase diagram entanglement vs energy. Moreover, the curve which bounds this area is exactly the one followed if both interactions are equal and the entire four qubit system is isolated. We also consider the case when the target pair of qubits is subjected to losses and can spontaneously decay.