Quantum computing
It may be good to get some knowledge about quantum computing, including quantum information theory, quantum algorithms and quantum cryptography.
With the recent release of OpenBSD they added an experimental post-quantum hybrid key exchange method based on Streamlined NTRU Prime (coupled with X25519) to iked(8) as sntrup761x25519.
There is a website where one can write in a sort of quantum assembly language some basic quantum algorithms. The website decribes that these are executed on there quantum computer (TU Delft, also see NTvN 86, (9). pp. 8–9).
For quantum networking have a look at NTvN 87, (8), pp. 32–37.
Some useful background literature for quantum mechanics includes books of Bransden and Joachaim; Sakurai; Griffiths; Redhead; and Shankar. Also confer the lecture notes Grondslagen van de Quantummechanica (in Dutch), which includes the postulates, interpretation using a precise formalism of quantum mechanics.