Adiabatic Mach-Zehnder Interferometry on A Quantized Bose-Josephson Junction

Abstract

We propose a scheme to achieve a Mach-Zehnder interferometry using a quantized Bose-Josephson junction with negative charging energy. The quantum adiabatic evolution through a dynamical bifurcation is used to accomplish the beam splitting and recombination. The negative charging energy ensures the existence of a path-entangled state which enhances the phase measurement precision to the Heisenberg limit. A feasible detection procedure is also presented. The scheme should be realizable with current technology.

Revised version, 4 pages, 4 figures, Accepted for publication in Physical Review Letters