Physics – Quantum Physics
Scientific paper
2011-07-04
Phys. Rev. Lett 107, 250501 (2011)
Physics
Quantum Physics
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.107.250501
We experimentally demonstrate a controlled-phase gate for continuous variables in a fully measurement-based fashion. In our scheme, the two independent input states of the gate, encoded in two optical modes, are teleported into a four-mode Gaussian cluster state. As a result, one of the entanglement links present in the initial cluster state appears in the two unmeasured output modes as the corresponding entangling gate acting on the input states. The genuine quantum character of this gate becomes manifest and is verified through the presence of entanglement at the output for a product two-mode coherent input state. By combining our controlled-phase gate with the recently reported module for universal single-mode Gaussian operations [R. Ukai et al., Phys. Rev. Lett. 106, 240504 (2011)], it is possible to implement universal Gaussian operations on arbitrary multi-mode quantum optical states in form of a fully measurement-based one-way quantum computation.
Furusawa Akira
Loock Peter van
Ukai Ryuji
Yokoyama Shota
Yoshikawa Jun-ichi
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