Setup for interaction-free measurement of multiple objects using single quantum probe

A theoretical setup is presented that extends quantum interaction-free measurement to include multiple objects. This is done by chaining and overlapping multiple single-object quantum interaction-free measurement devices so that the output of the device measuring the first object becomes the input of the device measuring the second object. The state of the system of classical objects (bits) is encoded into spatial or temporal degrees of freedom of the quantum probe. Different setup variations and applications are discussed.