Abstract
The implementation of an optical system universal logic-qubit controlled-NOT gate of decoherence-free subspaces (DFSs) using the cross-Kerr nonlinearity effect is discussed. Both the control qubit and the target qubit contain two photons, the states of which are DFSs of collective-rotating noise or collective-dephasing noise. A three-qubit parity-check circuit, which is the most important unit of the quantum gate, is proposed first, and only one ancillary photon is needed in our scheme. A single-photon source, linear optical apparatus, and quantum nondemolition detector are used to perform the process. Its efficiency may approach 100% with a feed-forward process. The experimental feasibility of the strategy with current technology is also considered.
© 2013 Optical Society of America
Full Article | PDF ArticleMore Like This
Fang-Fang Du, Xue-Mei Ren, Zhi-Guo Fan, Ling-Hui Li, Xin-Shan Du, Ming Ma, Gang Fan, and Jing Guo
Opt. Express 32(2) 1686-1700 (2024)
Meng-Zheng Zhu and Xin-Guo Yin
J. Opt. Soc. Am. B 30(2) 355-361 (2013)
Meng-Zheng Zhu and Liu Ye
J. Opt. Soc. Am. B 31(3) 405-411 (2014)