Kazuma Obigane | Searcharxiv

arXiv2026

Experimental test of symmetron-field based dark energy model using neutron interferometry

We report phase shift measurements of neutron matter waves propagating in vacuum and low-pressure Argon gas, using a technique developed for neutron interferometric scattering length measurements. The experiment probes additional phase shifts induced by couplings to scalar fields. From the absence of such effects, we set stringent constraints on a scalar symmetron-field, a leading candidate for quintessence dark energy.

hep-ph↗

arXiv2020

Experimental Test of Tight State-Independent Preparation Uncertainty Relations for Qubits

The well-known Robertson-Schroedinger uncertainty relations miss an irreducible lower bound. This is widely attributed to the lower bound's state-dependence. Therefore, Abbott \emph{et al.} introduced a general approach to derive tight state-independent uncertainty relations for qubit measurements [Mathematics 4, 8 (2016)]. The relations are expressed in two measures of uncertainty, which are standard deviation and entropy, both functions of the expectation value. Here, we present a neutron optical test of the tight state-independent preparation uncertainty relations for non-commuting Pauli spin observables with mixed spin states. The final results, obtained in a polarimetric experiment, reproduce the theoretical predictions evidently for arbitrary initial states of variable degree of polarization.

quant-ph↗