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Machida and one of the present authors (M.N.)1) have proposed a parallel run of double Stern-Gerlach experiments, in order to discriminate the many-Hilbert-spaces theory2) from the environment-induced-superselection-rule theory given by Zurek.) However, this type of experiment would not be so easy for particles with spin one-half. In this paper we propose a similar type of experiment using a photon beam. The proposed experiment is also used to examine the many-worlds interpretation.) Consider a measurement of an observable, F, of an object system, Q, in a superposed state ¢Q= 2.;.iCiUirp, Ui being an eigenstate of F belonging to an eigenvalue Ai and Ci=(Uirp, ¢Q). rp stands for a wave function with respect to observables other than F, for example, for a wave packet function of position variables in case F is spin or polarization. The Stern-Gerlach type of experiment is divided into two steps, the first being responsible for spectral decomposition and the second for detection. In the first step the wave function changes as

Proposed Photon Interference Experiment for Test of Quantum Measurement Theories