Hosseini, MahdiRebic, StojanSparkes, BenjaminTwamley, J.Buchler, BenjaminLam, Ping Koy2015-12-082015-12-082047-7538http://hdl.handle.net/1885/32915Large nonlinearity at the single-photon level can pave the way for the implementation of universal quantum gates. However, realizing large and noiseless nonlinearity at such low light levels has been a great challenge for scientists in the past decade. HeKeywords: CNOT gate; Cross-phase modulation; Electromagnetically induced transparency; Parity gate; Quantum memory201210.1038/lsa.2012.402016-02-24