title: Experimental realization of a controlled-NOT gate with four-photon six-qubit cluster states.
abstract: We experimentally demonstrate an optical controlled-NOT (CNOT) gate with arbitrary single inputs based on a 4-photon 6-qubit cluster state entangled both in polarization and spatial modes. We first generate the 6-qubit state, and then, by performing single-qubit measurements, the CNOT gate is applied to arbitrary single input qubits. To characterize the performance of the gate, we estimate its quantum process fidelity and prove its entangling capability. In addition, our results show that the gate cannot be reproduced by local operations and classical communication. Our experiment shows that such hyper-entangled cluster states are promising candidates for efficient optical quantum computation.
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Wei-Bo
authors.initials: WB
authors.lastname: Gao
authors.forename: Ping
authors.initials: P
authors.lastname: Xu
authors.forename: Xing-Can
authors.initials: XC
authors.lastname: Yao
authors.forename: Otfried
authors.initials: O
authors.lastname: Gühne
authors.forename: Adán
authors.initials: A
authors.lastname: Cabello
authors.forename: Chao-Yang
authors.initials: CY
authors.lastname: Lu
authors.forename: Cheng-Zhi
authors.initials: CZ
authors.lastname: Peng
authors.forename: Zeng-Bing
authors.initials: ZB
authors.lastname: Chen
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan