Weak and continuous measurements in superconducting circuits

          @misc{ scivideos_PIRSA:16060040,
            doi = {10.48660/16060040},
            url = {https://pirsa.org/16060040},
            author = {Dressel, Justin},
            keywords = {Quantum Foundations},
            language = {en},
            title = {Weak and continuous measurements in superconducting circuits},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {jun},
            note = {PIRSA:16060040 see, \url{https://scivideos.org/index.php/pirsa/16060040}}
          }
          

Abstract

Superconducting circuit technology has rapidly developed over the past several years to become a leading contender for realizing a scalable quantum computer. Modern circuit designs are based on the transmon qubit, which coherently superposes macroscopic charge oscillations. Measurements of a transmon are fundamentally weak and continuous in time, with projective measurements emerging only after a finite duration. Adding gates, such measurements may then implement ancilla-based measurements of controllable strength. Recent experiments have used both types of weak measurement to great effect: for monitoring qubit evolution, and for showing violations of a hybrid Bell-Leggett-Garg inequality.