Thermal-dephasing-tolerant generation of Schrödinger cat states with Rydberg dressed blockade

Multipartite entangled states involving non-locality are one of the most fascinating characteristics of quantum mechanics. In this work, we propose a generation of Schrödinger cat states in Rydberg atom arrays against the thermal dephasing. Unlike the previous work for producing large-scale entanglement [A. Omran et al, Science 365, 570 (2019)], we encode logical 1 on dressed states rather than Rydberg states. Such treatment can increase the lifetime of multipartite entanglement coherence to around 3 times compared to the previous work [A. Omran et al, Science 365, 570 (2019)], at the same system size, and therefore induce solid fidelities of Schrödinger cat states generation. The current work theoretically verifies the advantages of Rydberg dressed state in many-body quantum entanglement, which is meaningful for large-scale quantum computation and many-body Rydberg quantum simulation.
9 pages, 8 figures, 1 table