Quantum diffusion of microcavity solitons

Coherently pumped (Kerr) solitons in an ideal optical microcavity are expected to undergo random quantum motion that determines fundamental performance limits applications of the soliton microcombs1. Here this walk and its impact on Kerr timing jitter studied experimentally. The limit is discerned by measuring relative position counter-propagating solitons2. Their features weak interactions also presents common-mode suppression technical noise, which typically hides fluctuations. This contrast co-propagating solitons, found have well below a single account strong correlation their mutual motion. Good agreement between theory experiment. results establish microcombs provide new insights multisoliton physics. Quantum fundamentally microresonator frequency combs. generate comb spectra analysed, reaching establishing for microcombs.