Sackett, C.
, Kielpinski, D.
, King, B.
, Langer, C.
, Meyer, V.
, Myatt, C.
, Rowe, M.
, Turchette, Q.
, Itano, W.
, Wineland, D.
and Monroe, C.
(2000),
Entanglement of Four Particles, Nature, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105070
(Accessed August 13, 2024)