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Quantum fluctuations disrupt the cyclic motions of dissipative Kerr solitons
(DKSs) in nonlinear optical microresonators and consequently cause timing
jitter of the emitted pulse trains. This problem is translated to the performance
of several applications that employ DKSs as compact frequency comb sources.
Recently, device manufacturing and noise reduction technologies have
advanced to unveil the quantum properties of DKSs. Here we investigate the
quantum decoherence of DKSs existing in normal-dispersion microresonators

Normal group velocity dispersion (GVD) microcombs offer high comb line power and high pumping efficiency
compared to bright pulse microcombs. The recent demonstration of normal GVD microcombs using CMOS foundry-produced
microresonators is an important step toward scalable production. However, the chromatic dispersion of
CMOS devices is large and impairs the generation of broadband microcombs. Here, we report the development of a
microresonator in which GVD is reduced due to a coupled-ring resonator configuration. Operating in the turnkey