Protecting Bell correlation via quantum partially collapsing measurement

Abstract

Quantum correlation is the workhorse of quantum information processing tasks. It is well known that the correlation in open system is unavoidably decayed. Here, we investigate the dynamics of Bell correlation when a bipartite state interacts with a relativistic frame and noisy environment. Based on quantum partially collapsing measurement, we then propose two feasible schemes to protect the degraded Bell correlation and demonstrate that our schemes are valid. At last, we explore the trade-off relation between success probability and measurement strength. The larger the measurement strength, the less probability of success.