Kavli Affiliate: Kerry J. Vahala
| First 5 Authors: Chengying Bao, Myoung-Gyun Suh, Boqiang Shen, Kemal Şafak, Anan Dai
| Summary:
Coherently-pumped (Kerr) solitons in an ideal optical microcavity are
expected to undergo random quantum motion that determines fundamental
performance limits in applications of soliton microcombs. Here, this diffusive
motion and its impact on Kerr soliton timing jitter is studied experimentally.
Typically hidden below technical noise contributions, the quantum limit is
discerned by measuring counter-propagating solitons. Their relative motion
features only weak interactions and also presents excellent common mode
suppression of technical noise. This is in strong contrast to co-propagating
solitons which are found to have relative timing jitter well below the quantum
limit of a single soliton on account of strong mutual motion correlation. Good
agreement is found between theory and experiment. The results establish the
fundamental limits to timing jitter in soliton microcombs and provide new
insights on multi-soliton physics
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