PIRSA:16060096

Protecting weak measurements against systematic errors

Pang, S. (2016). Protecting weak measurements against systematic errors . Perimeter Institute. https://pirsa.org/16060096

Pang, Shengshi. Protecting weak measurements against systematic errors . Perimeter Institute, Jun. 10, 2016, https://pirsa.org/16060096 

          @misc{ pirsa_PIRSA:16060096,
            doi = {10.48660/16060096},
            url = {https://pirsa.org/16060096},
            author = {Pang, Shengshi},
            keywords = {Quantum Foundations},
            language = {en},
            title = {Protecting weak measurements against systematic errors },
            publisher = {Perimeter Institute},
            year = {2016},
            month = {jun},
            note = {PIRSA:16060096 see, \url{https://pirsa.org}}
          }

Shengshi Pang

DOI 10.48660/16060096
Collection
Talk Type Scientific Series
Subject

Abstract

Decoherence in quantum metrology may deviate the estimate of a parameter from the real value of the parameter. In this talk, we show how to suppress the systematic error of weak-measurement-based quantum metrology under decoherence. We derive the systematic error of maximum likelihood estimation in general to the first order approximation of a small deviation in the probability distribution, and compare the systematic error of standard weak measurement and postselected weak measurements, which shows that the systematic error of a postselected weak measurement with a large weak value can be significantly lower than that of a standard weak measurement when the probe undergoes decoherence.