Quantum entanglement and state decay measurement

Uncorrelated identical systems undergoing decay are the archetypal Poisson process, whose lifetime can only be determined with fractional uncertainty 1/sqrt(N) for N decays. A multipartite quantum system undergoing decay into a single channel spontaneously enters a series of superradiant states. We posit that the subsequent decay sequence of that system has a different variance, indicating that the entanglement in the superradiant states may lead to a more precise lifetime measurement. We summarize the results of our numerical tests of this hypothesis.