RT Journal Article SR Electronic T1 An atom interferometer inside a hollow-core photonic crystal fiber JF Science Advances JO Sci Adv FD American Association for the Advancement of Science SP e1701723 DO 10.1126/sciadv.1701723 VO 4 IS 1 A1 Xin, Mingjie A1 Leong, Wui Seng A1 Chen, Zilong A1 Lan, Shau-Yu YR 2018 UL http://advances.sciencemag.org/content/4/1/e1701723.abstract AB Coherent interactions between electromagnetic and matter waves lie at the heart of quantum science and technology. However, the diffraction nature of light has limited the scalability of many atom-light–based quantum systems. We use the optical fields in a hollow-core photonic crystal fiber to spatially split, reflect, and recombine a coherent superposition state of free-falling 85Rb atoms to realize an inertia-sensitive atom interferometer. The interferometer operates over a diffraction-free distance, and the contrasts and phase shifts at different distances agree within one standard error. The integration of phase coherent photonic and quantum systems here shows great promise to advance the capability of atom interferometers in the field of precision measurement and quantum sensing with miniature design of apparatus and high efficiency of laser power consumption.