** Shares of quantum computing firm IonQ IONQ.N fall ~3% to $21.17
** Kerrisdale Capital says it has taken short position in IonQ
** Massive scaling challenges and reliance on photonic interconnects means co is nowhere close to producing commercially viable product, Kerrisdale says
** "As reality sets in on the quantum computing bubble, IONQ remains wildly inflated," investment firm says
** Reuters could not independently verify the claims in the short seller's report
** IonQ did not immediately respond to Reuters' request for comment
** Stock more than tripled in 2024
(Reporting by Harshita Mary Varghese in Bengaluru)
((HarshitaMary.Varghese@thomsonreuters.com))
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