In addition to the usual argument about the impracticality of the one time pad. There is also that it is symmetric cryptography (the one time pad is a shared se

In addition to the usual argument about the impracticality of the one time pad. There is also that it is symmetric cryptography (the one time pad is a shared secret). Symmetric algorithms (AES-256 in particular) are generally considered to be quantum resistant. Here is what written about it in the article. > Symmetric cryptography, using a single secret key to encrypt and authenticate data: In our current understanding, symmetric cryptography is not impacted by quantum computers for all practical purposes. Grover's algorithm could be used as an attack here, but is currently considered infeasible for even medium-term quantum computers. (See "Reassessing Grover's Algorithm, 2017") The algorithms most affected by quantum cryptanalysis are public key (asymmetrical) algorithms, because we already have effective quantum algorithms against them (Shor's in particular). We are not even close to having the computer though.