The subject of post-quantum cryptography has been mentioned by Vitalik and many others as an important field of research.
I just wanted link to a Post-quantum cryptography tool called Codecrypt by exaexa. The infopage, github repo, reading material, as well as his bachelor thesis on the subject can be found here: http://e-x-a.org/codecrypt/
Watching this talk given by Eric Ladizinsky of D-Wave will give you a synopsis of where exactly the state of Quantum Computing at D-Wave is today:
In terms of building quantum secure cryptosystems, you can look into some of the research, and resources found at: http://pqcrypto.org/
You can play around with Grover's and Shor's algorithm at Google's Quantum Computing Playground: http://qcplayground.withgoogle.com/#/home
Let's start a discussion. Quantum secure all the things!