None of the exchanges ca bring an impenetrable security option but its good to see that quantum computers will engage into cryptocurrencies specially with an exchange besides facebook doing a coin therefore I will watch if they can compete with the current ones that are on top like Coinbase or Bistamp or even Binance.
What is still under question is the fact that we're still years away until we gonna see an exchanges based on this tech or maybe who knows they already developing it without public knowledge but exchanges will always get hacked no matter what
.