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Here is a list of the most relevant facts and assumptions regarding my concern:

Monero is a POW (proof-of-work) cryptocurrency. A risk of POW cryptos is the 51% attack, which is possible when a bad actor possesses the majority of the network's hashing power. Quantum computers will likely be many orders of magnitude faster than silicon-based (which I'll call "legacy") computers. A bad actor with a quantum computer would potentially pose a threat to a POW network otherwise solely maintained by legacy computers. The advent of the quantum computing era will contain a small timeframe - right at its inception - where very, very few people will have access to a quantum computer. One or more of those very, very early possessors of a quantum computer could be bad actors.

Based on the above facts and circumstances, I believe there to be a risk related to the transition from legacy to quantum computing that will eventually need to be addressed, if it hasn't been already. Does the monero community have a formal plan for blockchain integrity and wallet safety related to this risk? If so, what is it?

FYI, there is another SE question re: quantum computing here.