A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
No-Broadcasting Characterizes Operational Contextuality
Tekijät: Jokinen, Pauli; Weilenmann, Mirjam; Plavala, Martin; Pellonpää, Juha-Pekka; Kiukas, Jukka; Uola, Roope
Kustantaja: AMER PHYSICAL SOC
Kustannuspaikka: COLLEGE PK
Julkaisuvuosi: 2024
Journal: Physical Review Letters
Tietokannassa oleva lehden nimi: PHYSICAL REVIEW LETTERS
Lehden akronyymi: PHYS REV LETT
Artikkelin numero: 240201
Vuosikerta: 133
Numero: 24
Sivujen määrä: 7
ISSN: 0031-9007
eISSN: 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.133.240201
Verkko-osoite: https://doi.org/10.1103/PhysRevLett.133.240201
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/477955869
Operational contextuality forms a rapidly developing subfield of quantum information theory. However, the characterization of the quantum mechanical entities that fuel the phenomenon has remained unknown with many partial results existing. Here, we present a resolution to this problem by connecting operational contextuality one-to-one with the no-broadcasting theorem. The connection works both on the level of full quantum theory and subtheories thereof. We demonstrate the connection in various relevant cases, showing especially that for quantum states the possibility of demonstrating contextuality is exactly characterized by non-commutativity, and for measurements this is done by a norm-1 property closely related to repeatability. Moreover, we show how techniques from broadcasting can be used to simplify known foundational results in contextuality.
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