A set of atomic clocks linked together using the principles of quantum physics could be the authoritative world clock — more accurate and stable than any atomic clock today.

Mikhail Lukin of Harvard University in Cambridge, Massachusetts, and his team propose combining ultra-precise atomic clocks using quantum entanglement, which links the quantum states of particles separated over large distances. Entangling the clocks would allow scientists to combine measurements in a way that reduces the overall noise, rendering the combined signal more accurate. The resulting space-based network could be used to synchronize timekeeping standards globally, the authors say.

Building the clock will require technological advances, such as improving the stability of clock signals sent through Earth's turbulent atmosphere.

Nature Phys. http://doi.org/s7k (2014)