Photon Counting in Microwave Superconducting Circuits

Explore an advanced physics lecture on photon counting techniques in microwave superconducting circuits, focusing on the applications of Josephson photomultipliers (JPM) in quantum information processing. Delve into the fundamental principles of superconducting circuit quantum electrodynamics (QED) and learn how Josephson junctions create atom-like systems that interact with microwave photons. Examine two distinct JPM designs and their operational mechanisms, followed by an in-depth discussion of photon counting methods in resonator modes through repetitive JPM measurements. Discover the latest developments in JPM-based photon pair detection and understand their significance in quantum state engineering and qubit readout applications. Drawing from recent scientific literature and research findings, gain comprehensive insights into this cutting-edge field at the intersection of quantum physics and superconducting technology.