Video URL
https://pirsa.org/16060096Protecting weak measurements against systematic errors
APA
Pang, S. (2016). Protecting weak measurements against systematic errors . Perimeter Institute for Theoretical Physics. https://pirsa.org/16060096
MLA
Pang, Shengshi. Protecting weak measurements against systematic errors . Perimeter Institute for Theoretical Physics, Jun. 10, 2016, https://pirsa.org/16060096
BibTex
@misc{ scivideos_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 for Theoretical Physics}, year = {2016}, month = {jun}, note = {PIRSA:16060096 see, \url{https://scivideos.org/index.php/pirsa/16060096}} }
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.