Ultrafast sub-nanometer matter-wave temporal Talbot effect

We acknowledge support Ministerio de Ciencia e Innovacion (PID2019-106910GB-I00). This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 851201). We also acknowledge support from Junta de Castilla y Leon FEDER funds (Project No. SA287P18). AG-C acknowledges support from Ministerio de Educacion, Cultura y Deporte (FPU18/03348). CH-G acknowledges Ministerio de Ciencia, Innovacion, y Universidades for a Ramon y Cajal contract (RYC-2017-22745), co-funded by the European. Social Fund.