Non-local geometric phase in two-photon interferometry A. Martin, O. Alibart, J.-C. Flesch, J. Samuel, Supurna Sinha, S. Tanzilli and A. Kastberg EPL, 97 1 (2012) 10003 Published online: 03 January 2012 DOI: 10.1209/0295-5075/97/10003