Exact quantum sensing limits for bosonic dephasing channels

Autor:	Huang, Zixin, Lami, Ludovico, Wilde, Mark M.
Rok vydání:	2024
Předmět:	Quantum Physics Condensed Matter - Other Condensed Matter Computer Science - Information Theory
Zdroj:	PRX Quantum, vol. 5, no. 2, page 020354, June 2024
Druh dokumentu:	Working Paper
DOI:	10.1103/PRXQuantum.5.020354
Popis:	Dephasing is a prominent noise mechanism that afflicts quantum information carriers, and it is one of the main challenges towards realizing useful quantum computation, communication, and sensing. Here we consider discrimination and estimation of bosonic dephasing channels, when using the most general adaptive strategies allowed by quantum mechanics. We reduce these difficult quantum problems to simple classical ones based on the probability densities defining the bosonic dephasing channels. By doing so, we rigorously establish the optimal performance of various distinguishability and estimation tasks and construct explicit strategies to achieve this performance. To the best of our knowledge, this is the first example of a non-Gaussian bosonic channel for which there are exact solutions for these tasks. Comment: v1: 21 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2402.05793 Zobrazit plný text záznamu View this record from Arxiv