Środowiskowe Seminarium z Informacji i Technologii Kwantowych

We investigate which pure states of n photons in d modes can be transformed into each other via linear optics, without post-selection. In other words, we study the local unitary (LU) equivalence classes of symmetric many-qudit states. We provide a straightforward method for calculating invariants, which can be also measured experimentally.The results are related the feasibility of generating quantum states from others in the lab, when using only beam splitters and waveplates.