Expérimental et théorique
This internship proposal concerns a second generation of experiments evaluating the contribution of non-classical, entangled states to improve the stability of atomic clocks. Spin squeezed states redistribute the fundamental quantum noise of the atomic phase to a conjugate variable of secondary interest. This overcomes the fundamental signal-to-noise limit of today's best clocks. The principle of improvement has been demonstrated by several teams around the world, but no device has yet reached the performance level of a real clock. Our aim is to improve, for the first time, a state-of-the-art atomic clock.