@article{oai:kutarr.kochi-tech.ac.jp:00000285,
 author = {Ogawa, Kazuhisa and Tamate, Shuhei and Kobayashi, Hirokazu and Nakanishi, Toshihiro and Kitano, Masao},
 issue = {6},
 journal = {Physical Review A},
 month = {Jun},
 note = {We observed experimentally nonlinear variations in the three-vertex geometric phase in a two-photon polarization qutrit. The three-vertex geometric phase is defined by three quantum states, which generally form a three-state (qutrit) system. By changing one of the three constituent states, we observed two rapid increases in the three-vertex geometric phase. The observed variations are inherent in a three-state system and cannot be observed in a two-state system. We used a time-reversed two-photon interferometer to measure the geometric phase with much more intense signals than those of a typical two-photon interferometer.},
 pages = {062118-1--062118-6},
 title = {Observation of nonlinear variations in a three-vertex geometric phase in a two-photon polarization qutrit},
 volume = {91},
 year = {2015}
}