Uncertainty relations for the support of quantum states

Vincenzo Fiorentino; Stefan Weigert

doi:10.1088/1751-8121/aca9a4

Uncertainty relations for the support of quantum states

Vincenzo Fiorentino, Stefan Weigert

Mathematics

Research output: Contribution to journal › Article › peer-review

Abstract

Given a narrow signal over the real line, there is a limit to the localisation of its Fourier transform. In spaces of prime dimensions, Tao derived a sharp state-independent uncertainty relation which holds for the support sizes of a pure qudit state in two bases related by a discrete Fourier transform. We generalise Tao's uncertainty relation to complete sets of mutually unbiased bases in spaces of prime dimensions. The bound we obtain appears to be sharp for dimension three only. Analytic and numerical results for prime dimensions up to nineteen suggest that the bound cannot be saturated in general. For prime dimensions two to seven we construct sharp bounds on the support sizes in (d + 1) mutually unbiased bases and identify some of the states achieving them.

Original language	English
Article number	495305
Number of pages	23
Journal	Journal of Physics A: Mathematical and Theoretical
Volume	55
Issue number	49
DOIs	https://doi.org/10.1088/1751-8121/aca9a4
Publication status	Published - 19 Dec 2022

Bibliographical note

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10.1088/1751-8121/aca9a4Licence: CC BY

Fiorentino_2022_J._Phys._A__Math._Theor._55_495305
© 2022 The Author(s)
Final published version, 412 KBLicence: CC BY

Cite this

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AU - Weigert, Stefan

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