2011/06/30 by Paulo Jose dos Reis, Paulo José dos Reis, S. Shelly Sharma +3
Computer Science · Physics and Astronomy · #Coherent states #Field (mathematics) #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum information #Quantum optics and atomic interactions #Qubit #Separable space #State (computer science) #Sudden death #W state #quant-ph
paper · pdf · doi:10.1140/epjd/e2013-30683-7
published as The European Physical Journal D, Vol. 67 : 84 (April 2013) · 14 pages, 7 figures, sections III and IV merged with section II and analytic expressions moved to Appendices A and B. Figures improved and corrected typos
arxiv created 2011/11/02 · openalex publication_date 2013/04/01 · arxiv updated 2013/05/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A pair of two level atoms A1A2, prepared either in a separable state or in an entangled state, interacts with a single mode of two mode squeezed cavity field while a third atomic qubit B interacts with the second mode of the squeezed field in a remote cavity. We analyze, numerically, the generation, sudden death and revival of three qubit entanglement as a function of initial entanglement of qubits A1A2 and degree of squeezing of electromagnetic field. Global negativity of partially transposed state operator is used to quantify the entanglement of three atom state. It is found that the initial entanglement of two mode field as well as that of the pair A1A2, both, contribute to three atom entanglement. A maximally entangled single excitation Bell pair in first cavity and two mode field with squeeze parameter s=0.64 are the initial conditions that optimize the peak value of three qubit mixed state entanglement. A smaller value of s=0.4 under similar conditions is found to generate a three qubit mixed state with comparable entanglement dynamics free from entanglement sudden death.