This article was inspired by my recent experience at the Black Hat and Defcon cybersecurity conferences. Quantum computing and post-quantum cryptography emerged as major topics, more prominently than ever before. One can say that this is because of the anticipated release of the NIST standard for post-quantum cryptographic algorithms which officially happened immediately after the conferences concluded. However, this release might be just the tip of the iceberg, with significant developments likely hidden from public view. Now, let’s start from the beginning and define what quantum computing is and why we should pay attention to it when it comes to a conversation about payments.