1. A superconducting Analog-to-Digital Converter (ADC), comprising: N resonators, with N being at least 2; a Josephson Junction (JJ) comparator, wherein all N said resonators connect in parallel to said JJ comparator, and wherein said JJ comparator is providing an implicit feedback for all N said resonators; and wherein said ADC is characterized as being an N th -order bandpass sigma-delta ADC.