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Experimental multi-state quantum discrimination in the frequency domain with quantum dot light

  • The quest for the realization of effective quantum state discrimination strategies is of great interest for quantum information technology, as well as for fundamental studies. Therefore, it is crucial to develop new and more efficient methods to implement discrimination protocols for quantum states. Among the others, single photon implementations are more advisable, because of their inherent security advantage in quantum communication scenarios. In this work, we present the experimental realization of a protocol employing a time-multiplexing strategy to optimally discriminate among eight non-orthogonal states, encoded in the four-dimensional Hilbert space spanning both the polarization degree of freedom and photon energy. The experiment, built on a custom-designed bulk optics analyser setup and single photons generated by a nearly deterministic solid-state source, represents a benchmarking example of minimum error discrimination with actual quantum states, requiring only linear optics and two photodetectors to be realized. Our work paves the way for more complex applications and delivers a novel approach towards high-dimensional quantum encoding and decoding operations.

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Author:Alessandro Laneve, Michele B. Rota, Francesco Basso Basset, Nicola P. Fiorente, Tobias M. Krieger, Saimon Filipe Covre da Silva, Quirin Buchinger, Sandra Stroj, Sven Höfling, Tobias Huber-Loyola, Armando Rastelli, Rinaldo Trotta, Paolo Mataloni
DOI:https://doi.org/10.48550/arXiv.2209.08324
Parent Title (English):Arxiv, quant-ph
Document Type:Preprint
Language:English
Year of publication:2022
Release Date:2024/02/29
Number of pages:13
Organisationseinheit:Forschung / Forschungszentrum Mikrotechnik
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 600 Technik
Open Access?:ja
Peer review:wiss. Beitrag, nicht peer-reviewed
Publicationlist:Stroj, Sandra