Just writing here to clear up all the misinformation in this thread...

How do you become a quant? There are three ways:

1. Get a PhD or masters in a quantitative subject (math, physics, CS)
2. No PhD? Then get work experience at sell-side financial markets.
3. No work experience? Then be extremely good at programming. Brush up on your C++ and Python programming skills.

It's very unlikely for someone to become a quant with just a bachelor's degree. If any degree holder tells you his job title is a "quant", he is most likely in a trading, risk, or software development role.

It's getting even more competitive now with the flood of MFE graduates these days. Many of these MFE grads end up in risk management roles or software engineering roles (which are not too bad and pay quite decently too).