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The authors thank Jian-Wei Pan for helpful discussions. This research was supported by the National Key R&D Program of China (2019YFA0308700, 2017YFA0303700), the National Natural Science Foundation of China (61734005, 11761141014, 11690033), the Science and Technology Commission of Shanghai Municipality (STCSM) (17JC1400403), and the Shanghai Municipal Education Commission (SMEC) (2017-01-07-00-02- E00049). X.-M.J. acknowledges additional support from a Shanghai talent program.\

Methods {#methods .unnumbered}
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#### Experimental details: {#experimental-details .unnumbered}

The $^{133}$Cs cell is 75-mm-long and is placed into a magnetic field shielding, which has been filled 10 $Torr$ Ne buffer gas to alleviate collisions between cesium atoms. In order to get a large optical depth, which means there are more atoms participating in the creation of entanglement, the $^{133}$Cs cell is heated to 61$^{\circ}$C. To generate high-speed light pulse with enough intensity shown in Figure 1, we have developed a system to satisfy the needs of tunable central frequency, broad bandwidth, and more importantly, control pulse generated in a programable fashion. We have also established a frequency locked system to stabilize the W state during the creating and certifying process. It should be noticed that our collinear scheme makes the correlated Stokes and anti-Stokes photons being coaxial propagating under 