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Intensity mapping of the H I 21 cm line and the CO 2.61 mm line from theepoch of reionization has emerged as powerful, complementary, probes of thehigh-redshift Universe. However, both maps and their cross-correlation aredominated by foregrounds. We propose a new analysis by which the signal isunbiased by foregrounds, i.e. it can be measured without foreground mitigation.We construct the antisymmetric part of two-point cross-correlation betweenintensity maps of the H I 21 cm line and the CO 2.61 mm line, arising becausethe statistical fluctuations of two fields have different evolution in time. Weshow that the sign of this new signal can distinguish model-independentlywhether inside-out reionization happens during some interval of time. Moreimportantly, within the framework of the excursion set model of reionization,we demonstrate that the slope of the dipole of H I-CO cross-power spectrum atlarge scales is linear to the rate of change of global neutral fraction ofhydrogen in a manner independent of reionization parameters, until the slopelevels out near the end of reionization, but this trend might possibly dependon the framework of reionization modelling. The H I-CO dipole may be asmoking-gun probe for the speed of reionization, or "standard speedometer" forcosmic reionization. Observations of this new signal will unveil the globalreionization history from the midpoint to near the completion of reionization.

Antisymmetric Cross-correlation between H I and CO Line Intensity Maps as a New Probe of Cosmic Reionization