Quantum theory of phase estimation

Understand

Advancements in physics are often motivated/accompanied by advancements in our precision measurements abilities.

• The current generation of atomic and optical interferometers is limited by shot noise, a fundamental limit when estimating a phase shift with classical light or uncorrelated atoms.
• In the last years, it has been clarified that the creation of special quantum correlations among particles, which will be called here useful entanglement, can strongly enhance the interferometric sensitivity.
• Pioneer experiments have already demonstrated the basic principles.