Discretized continuous quantum-mechanical observables that are neither continuous nor discrete

PLUTO / PLUTO-2 Spatial Light Modulators
Misc.: Speckle / Characterization / Metrology Optical Computing / Quantum Optics
Published on:
Authors: Thais L. Silva, Łukasz Rudnicki, Daniel S. Tasca, and Stephen P. Walborn
Abstract:
“Most of the fundamental characteristics of quantum mechanics, such as nonlocality and contextuality, are manifest in discrete, finite-dimensional systems. However, many quantum information tasks that exploit these properties cannot be directly adapted to continuous variable systems. To access these quantum features, continuous quantum variables can be made discrete by binning together their different values, resulting in observables with a finite number, d, of outcomes. While direct measurement indeed confirms their manifestly discrete character, here we employ a salient feature of quantum physics known as mutual unbiasedness to show that such coarse-grained observables are in a sense neither continuous nor discrete. Depending on d, the observables can reproduce either the discrete or the continuous behavior, or neither. To illustrate these results, we present an example for the construction of such measurements and employ it in an optical experiment confirming the existence of four mutually unbiased measurements with d=3 outcomes in a continuous variable system, surpassing the number of mutually unbiased continuous variable observables.”

Open Access

Publication: Physical Review Research
Issue/Year: Physical Review Research, Volume 4; Number 1; Pages 013060; 2022
DOI: 10.1103/physrevresearch.4.013060
Link: https://doi.org/10.1103/physrevresearch.4.013060

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