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Arbitrary Nth-order ($N\geq2$) lensless ghost imaging with thermal light hasbeen performed for the first time by only recording the intensities in twooptical paths. It is shown that the image visibility can be dramaticallyenhanced as the order N increases. It is also found that longer integrationtimes are required for higher-order correlation measurements as N increases,due to the increased fluctuations of higher-order intensity correlationfunctions.

Arbitrary-order lensless ghost imaging with thermal light