Complex counterpart of variance in quantum measurements for pre- and postselected systems

12 Feb 2021 Kazuhisa Ogawa Natsuki Abe Hirokazu Kobayashi Akihisa Tomita

The variance of an observable for a preselected quantum system, which is always real and non-negative, appears in the increase of the probe wave packet width in indirect measurement. We extend this framework to pre- and postselected systems, and formulate a complex-valued counterpart of the variance called "weak variance.".. (read more)

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