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Non-Hermitian (NH) PT-symmetric systems were found to be able to discriminate two quantum states better than the Hermitian strategy. In this work, we propose a QSD approach based on P-pseudo-Hermitian systems with real spectra. We theoretically prove the feasibility of realizing QSD in the real-spectrum phase of a P-pseudo-Hermitian system, i.e., two arbitrary non-orthogonal quantum states can be discriminated by a suitable P-pseudo-Hermitian Hamiltonian. In detail, we decide the minimal angular separation between two non-orthogonal quantum states for a fixed P-pseudo-Hermitian Hamiltonian, and we find the orthogonal evolution time is able to approach zero under suitable conditions, while both the trace distance and the quantum relative entropy are employed to judge their orthogonality. We give a criterion to choose the parameters of a P-pseudo-Hermitian Hamiltonian that evolves the two initial orthogonal states faster than a fixed arbitrary PT-symmetric one with an identical energy difference. Our work expands the NH family for QSD, and can be used to explore real quantum systems in the future.<\/jats:p>","DOI":"10.3390\/e27080836","type":"journal-article","created":{"date-parts":[[2025,8,7]],"date-time":"2025-08-07T08:33:06Z","timestamp":1754555586000},"page":"836","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["A Guiding Principle for Quantum State Discrimination in the Real-Spectrum Phase of P-Pseudo-Hermitian Systems"],"prefix":"10.3390","volume":"27","author":[{"given":"Qinliang","family":"Dong","sequence":"first","affiliation":[{"name":"School of Energy Storage Science and Engineering, North China University of Technology, Beijing 100144, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xueer","family":"Gao","sequence":"additional","affiliation":[{"name":"School of Energy Storage Science and Engineering, North China University of Technology, Beijing 100144, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhihang","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Energy Storage Science and Engineering, North China University of Technology, Beijing 100144, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hui","family":"Li","sequence":"additional","affiliation":[{"name":"Integrated Circuit College, Beijing Polytechnic University, Beijing 100176, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1435-7724","authenticated-orcid":false,"given":"Jingwei","family":"Wen","sequence":"additional","affiliation":[{"name":"China Mobile (Suzhou) Software Technology Company Limited, Suzhou 215163, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8942-6651","authenticated-orcid":false,"given":"Chao","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Energy Storage Science and Engineering, North China University of Technology, Beijing 100144, China"},{"name":"Beijing Laboratory of New Energy Storage Technology, Beijing 100144, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,8,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"238","DOI":"10.1364\/AOP.1.000238","article-title":"Quantum state discrimination","volume":"1","author":"Barnett","year":"2009","journal-title":"Adv. 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