Local inaccessibility of random classical information and their implications in the change-point problem

Authors

• Snehasish Roy Chowdhury, Indian Statistical Institute, Kolkata
• Subhendu B. Ghosh, S. N. Bose National Centre for Basic Sciences
• Tathagata Gupta, Indian Statistical Institute, Kolkata
• Anandamay Das Bhowmik, Indian Institute of Science Education and Research Thiruvananthapuram
• Sutapa Saha, Harish Chandra Research Institute

Article Type

Research Article

Publication Title

Physical Review A

Abstract

Discrimination of quantum states under local operations and classical communication is an intriguing question in the context of local retrieval of classical information, encoded in the multipartite quantum systems. All the local quantum state discrimination premises considered so far mimic a basic communication setup, where the spatially separated decoding devices are independent of any additional input. Here, exploring a generalized communication scenario, we introduce a framework for input-dependent local quantum state discrimination, which we call local random authentication (LRA). We report that the impossibility of LRA certifies the presence of entangled states in the ensemble, a feature absent from erstwhile nonlocality arguments based on local state discrimination. Additionally, we explore the salient features of this state discrimination prototype for an arbitrary set of orthogonal quantum states and compare them with the traditional notion of local quantum state discrimination. Finally, our results reveal fundamental information-theoretic implications in the local estimation of quantum change-point problems.

DOI

10.1103/ylng-5j64

Publication Date

11-3-2025

Recommended Citation

Chowdhury, Snehasish Roy; Ghosh, Subhendu B.; Gupta, Tathagata; Bhowmik, Anandamay Das; and Saha, Sutapa, "Local inaccessibility of random classical information and their implications in the change-point problem" (2025). Journal Articles. 5449.
https://digitalcommons.isical.ac.in/journal-articles/5449