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It is challenging for observing superbunching effect with true chaotic light,here we propose and demonstrate a method to achieve superbunching effect of thedegree of second-order coherence is 2.42 with broadband stationary chaoticlight based on a cascaded Michelson interferometer (CMI), exceeding thetheoretical upper limit of 2 for the two-photon bunching effect of chaoticlight. The superbunching correlation peak is measured with an ultrafasttwo-photon absorption detector which the full width at half maximum reachesabout 95 fs. Two-photon superbunching theory in a CMI is developed to interpretthe effect and is in agreement with experimental results. The theory alsopredicts that the degree of second-order coherence can be much greater than $2$if chaotic light propagates $N$ times in a CMI. Finally, a new type of weaksignals detection setup which employs broadband chaotic light circulating in aCMI is proposed. Theoretically, it can increase the detection sensitivity ofweak signals 79 times after the chaotic light circulating 100 times in the CMI.

Two-photon superbunching effect of broadband chaotic stationary light at femtosecond timescale based on cascaded Michelson interferometer