Separated Schmidt modes in the angular spectrum of biphotons
N A Borshchevskaia, F Just, K G Katamadze, A Cavanna, M V Chekhova · Laser Physics Letters · 2019
Abstract We prepared qudits based on angular multimode biphoton states by modulating the pump angular spectrum. The modes were prepared in the Schmidt basis and their intensity distributions did not overlap in space. This allows one to get rid of filtering losses while addressing single modes and to realize a single-shot qudit readout.