Mach-Zehnder Interferometry at the Heisenberg Limit with Coherent and Squeezed-Vacuum Light
Mach-Zehnder Interferometry at the Heisenberg Limit with Coherent and Squeezed-Vacuum Light
We show that the phase sensitivity Deltatheta of a Mach-Zehnder interferometer illuminated by a coherent state in one input port and a squeezed-vacuum state in the other port is (i) independent of the true value of the phase shift and (ii) can reach the Heisenberg limit Deltatheta approximately 1/N(T), where …