In a blog post published today, Google claims that its 54-qubit quantum computer Sycamore calculated a complex problem in 200 seconds. The company also estimates the same problem would take the world's fastest supercomputer 10,000 years to solve. However, IBM (who owns the world's fastest supercomputer) says the estimate should be closer to 2.5 days. Either way, Google's achievement is a big milestone for quantum computing.
https://www.notebookcheck.net/Google-achieves-quantum-supremacy-IBM-cries-foul.440222.0.html