High precision positioning based on chirped-pulse interferometry

A new scheme is presented for high precision positioning based on chirped-pulse interferometry(CPI). In this scheme, a pair of oppositely chirped optical pulses with strong classical frequency correlations are combined at a beamsplitter. The output beams with two different paths are recombined and focused onto a nonlinear crystal. High precision positioning with magnitude of micron is obtained theoretically by detecting sum frequency interference signal as a function of relative delay between two different paths.The impact of difference between chirp and anti-chirp pulse on positioning is studied. It is shown that positioning has a high tolerance of difference between chirp and anti-chirp parameter. Our scheme exhibits all the advantages of quantum spatial positioning based on the Hong-Ou-Mandel(HOM) quantum interference, but with more simple experimental setup ,robustness against loss and greater signals, which provide more improvements in practical maneuverability.