What is Quantum Metrology?

Quantum mechanics is famous for its uncertainty principle that limits what you can measure. But oddly enough, quantum effects can actually help scientists make better measurements. This is what the field of quantum metrology is concerned with. In this video I explain what quantum metrology is and go through a few examples of what you can do with it.

The paper I mention about quantum optical tomography is here:

0.54 μm resolution two-photon interference with dispersion cancellation for quantum optical coherence tomography
Masayuki Okano, Hwan Hong Lim, Ryo Okamoto, Norihiko Nishizawa, Sunao Kurimura & Shigeki Takeuchi
Scientific Reports volume 5, Article number: 18042 (2016)

https://www.nature.com/articles/srep1...

And the paper about quantum enhanced magnetometry is here:

Geometric phase magnetometry using a solid-state spin
K. Arai, J. Lee, C. Belthangady, D. R. Glenn, H. Zhang & R. L. Walsworth
Nature Communications volume 9, Article number: 4996 (2018)

https://www.nature.com/articles/s4146...