Not my field, but here’s what I found on Wikipedia:

In contrast to the threat quantum computing poses to current public-key algorithms, most current symmetric cryptographic algorithms and hash functions are considered to be relatively secure against attacks by quantum computers.[2][9] While the quantum Grover’s algorithm does speed up attacks against symmetric ciphers, doubling the key size can effectively block these attacks.[10] Thus post-quantum symmetric cryptography does not need to differ significantly from current symmetric cryptography. Source: Post-Quantum Cryptography

There are some linked PDFs on that page, for those who want to know more.