Open quantum entanglement: a study of two atomic system in static patch of de Sitter space Samim Akhtar, Sayantan Choudhury, Satyaki Chowdhury, Debopam Goswami, Sudhakar Panda and Abinash Swain Eur. Phys. J. C, 80 8 (2020) 748 Published online: 17 August 2020 DOI: 10.1140/epjc/s10052-020-8302-2