@article{calafell2019trace,
 author = {Calafell, I Alonso and Strömberg, T and Arvidsson-Shukur, DRM and Rozema, LA and Saggio, V and Greganti, C and Harris, NC and Prabhu, M and Carolan, J and Hochberg, M and others},
 journal = {npj Quantum Information},
 number = {1},
 pages = {1--5},
 publisher = {Nature Publishing Group},
 title = {Trace-free counterfactual communication with a nanophotonic processor},
 volume = {5},
 year = {2019}
}