We don’t need quantum encryption unless you will secede the ground the Bitcoin is second best to quantum computing. In that case why even Bitcoin? As a Bitcoiner, are afraid of a single centralized computer (node), a single centralized observer (miner) and all the qubits (UTXO) are owned by a singular entity? Oh yeah we can talk about the artificial environment and black box error corrections necessary to attempt to coerce the qubits to remain coherent. Bitcoin has remained coherent for 16 years without a central authority or artificial conditions. What are you actually telling me you are afraid of?