3 papers
quant-ph2026
Dualistic operational characterization of device-dependent correlation sets via convex analysis in the Bell scenario
Ryosuke Nogami, Jaeha Lee
We analyze device-dependent correlation sets generated by fixed local dichotomic measurements for two-qubit systems in the Bell scenario. We consider three fundamental st…
quant-ph2025
Extension of the Watanabe-Sagawa-Ueda uncertainty relation for measurement errors to infinite-dimensional systems
Ryosuke Nogami
We extend the Watanabe--Sagawa--Ueda (WSU) uncertainty relations for measurement errors to infinite-dimensional systems. The original WSU formulation provided a definition of measu…
quant-ph2025
A Necessary and Sufficient Condition for Quantum Realizability of Correlations for Arbitrary Normalized Observables in the Clauser--Horne--Shimony--Holt Setup
Ryosuke Nogami, Jaeha Lee
We establish a necessary and sufficient condition for the existence of a quantum state that reproduces given correlation values in the Clauser--Horne--Shimony--Holt (CHSH) setup fo…