Joint measurability of coplanar POVMs

arXiv1 octombrie 20261 min de cititArticolul și perspectiva sunt în engleză.

arXiv:2609.38836v1 Announce Type: new Abstract: An unbiased qubit positive operator-valued measure (POVM) can be uniquely expressed in terms of the Bloch vector. We prove that for POVMs with coplanar Bloch vectors, they are jointly measurable if and only if the perimeter of the convex closure of Bloch vectors is less than or equal to 4. Moreover, as a corollary, we give an affirmative answer to the conjecture suggested by [Andrejic-Kunjwal 2020] on the existence of a joint device for POVMs whose Bloch vectors lie on the same circle.

Abstract:An unbiased qubit positive operator-valued measure (POVM) can be uniquely expressed in terms of the Bloch vector. We prove that for POVMs with coplanar Bloch vectors, they are jointly measurable if and only if the perimeter of the convex closure of Bloch vectors is less than or equal to 4. Moreover, as a corollary, we give an affirmative answer to the conjecture suggested by [Andrejic-Kunjwal 2020] on the existence of a joint device for POVMs whose Bloch vectors lie on the same circle.

arXiv:2609.38836 [quant-ph]

(or arXiv:2609.38836v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.38836 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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Joint measurability of coplanar POVMs

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