Abstract
The quantum router is an indispensable element in the future quantum network. In this study, by calculating the fidelity of the atom, we show that the quantum router proposed by J. Lu et al. (Phys. Rev. A 89, 013805, 2014) achieves quantum information-holding. After the single photon passes through the atom, the fidelity of the atom decreases from the maximum value after a period of time and rises to the maximum value of 1. Even upon changing the size of the classical field, this phenomenon will not disappear, only undergo a cycle change. This means such a single-photon quantum router can be applied experimentally since quantum state can be perfectly held after the routing.
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