We describe what a time crystal is from the early ideas of spontaneous breaking of time symmetry, and say what a discrete time crystal is.

Then we talk about Google's recent results claiming observation of a time crystal in a many-body localized state.

The Google arxiv paper:
https://arxiv.org/abs/2107.13571

Previous papers that observed time crystals from 2017:

https://www.nature.com/articles/natur...
https://www.nature.com/articles/natur...

Paper explaining the concept of discrete time crystals

https://journals.aps.org/prl/abstract...

#timecrystal #quantumcomputing #spontaneoussymmetrybreaking #quantuminformation