A programmable quantum computer renders the two mainstream public-key crypto systems useless. Both RSA and ECC (elliptic curve cryptography) algorithms would be cracked and unable to protect any data, period. The U.S. defense and intelligence agencies see quantum computing as the foundation for the IT industry in the mid-21st century. Some of the lattice-based crypto systems are orders of magnitude faster than RSA today — long-term security and performance improvements there’s a winner!”]
Source: https://www.csoonline.com/article/2136002/quantum-computing-and-data-protection.html