Shares of Quantum Computing Inc. (QUBT) plummeted 8.53% during Wednesday's trading session, as investors reacted to a stark warning from CNBC's Jim Cramer about speculative stocks in sectors including quantum computing. The significant drop comes as part of a broader sell-off in quantum computing and other speculative technology stocks.

Jim Cramer, the renowned CNBC TV host and former hedge fund manager, cautioned investors on Tuesday about certain speculative market sectors, including quantum computing. Cramer advised selling into any "snapback" momentum, warning that these speculative plays "will not go down without a fight." This warning appears to have triggered a sell-off in quantum computing stocks, with QUBT being hit particularly hard.

The decline in Quantum Computing Inc. was not isolated, as other quantum computing stocks also experienced significant drops. BTQ fell 15%, while D-Wave Quantum Inc. (QBTS) matched QUBT's 7% decline. Other players in the sector, such as Rigetti Computing (RGTI) and Arqit, also saw their shares fall by 4% or more. This sector-wide downturn suggests a broader reassessment of quantum computing stocks by investors following Cramer's comments and amid heightened market volatility in speculative tech sectors.