Quantum router modulated by two Rydberg atoms in a X-shaped coupled cavity array Xue-Peng Du, Qian Cao, Ning Dang and Lei Tan Eur. Phys. J. D, 75 3 (2021) 79 Published online: 05 March 2021 DOI: 10.1140/epjd/s10053-021-00085-9