Yes, the quantum vault is effectively a reference implementation of a quantum-secure wallet. "Quantum-secure" in this sense means for Bitcoin that it enforces no spending from the same address twice. In that sense, it's actually not as usable as other wallets from a UX perspective, but it does ensure that Bitcoin that you put there will not be quantum vulnerable.

Think of this as the "wallet" that pairs with the Bitcoin Risq List.

Another novel thing: it uses BIP-85 vs BIP-32 for key derivation, and in principle this wallet could support PQ-ready opcodes when they are introduced into Bitcoin.

BTW the vault also supports Ethereum, and in a slightly different way, but given the venue I assume you guys are more curious about the BTC aspect.