AMO Seminar - Monika Schleier-Smith - A Squeezed Atomic Clock Enabled by Cavity Feedback - Quantum Many-Body Systems Division LMU Munich

Jan 23, 2012, 2:00 pm3:30 pm
Jadwin A06


Event Description
Over a decade ago, the stability of atomic clocks reached the standard quantum limit, set by the projection noise inherent in measurements on an ensemble of uncorrelated particles. In a proof of-principle experiment, we have now demonstrated a clock that surpasses this limit by operating with atoms in a particular type of entangled state called a "squeezed spin state." I will describe our method of preparing squeezed spin states, which harnesses the collective interaction of an atomic ensemble with the light field in an optical cavity. I will further present data characterizing the squeezed clock, including the first measurement of an Allan deviation beyond the standard quantum limit.