Invited Speakers

Ana Maria Rey arey@cfa.harvard.edu Harvard

Theory of strongly correlated atoms It is well-known that entangled atomic states (e.g. so-called spin squeezed states) potentially allow to significantly improve resolution in Ramsey spectroscopy. However, entangled states are more fragile to phase decoherence than uncorrelated states, and, when decoherence is taken into account, both of them yield a similar limit to resolution. I will discuss a method to improve the limit associated with decoherence which relays on the dynamics of strongly correlated atoms governed by gapped Hamiltonians. I will show that the gap protects the system against local fluctuations and can thus provide an increase in the signal-to-noise ratio even in decoherence-limited measurements. Finally, I will discuss possible physical implementation of this method.