Experimental analysis of a four-qubit photon cluster state.
@article{Kiesel2005ExperimentalAO, title={Experimental analysis of a four-qubit photon cluster state.}, author={Nikolai Kiesel and Christian Schmid and Ulrich Weber and G{\'e}za T{\'o}th and Otfried G{\"u}hne and Rupert Ursin and Harald Weinfurter}, journal={Physical review letters}, year={2005}, volume={95 21}, pages={ 210502 } }
Linear-optics quantum logic operations enabled the observation of a four-photon cluster state. We prove genuine four-partite entanglement and study its persistency, demonstrating remarkable differences from the usual Greenberger-Horne-Zeilinger (GHZ) state. Efficient analysis tools are introduced in the experiment, which will be of great importance in further studies on multiparticle entangled states.
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References
SHOWING 1-10 OF 24 REFERENCES
Phys
- Rev. Lett. 86, 5188 (2001); M. A. Nielsen, Phys. Rev. Lett. 93, 040503
- 2004
Phys
- Rev. Lett. 86, 910
- 2001
A
- Ać n, E. Schenck, and M. Aspelmeyer, Phys. Rev. A 71, 042325
- 2005
Phys
- Rev. A 72, 022340
- 2005
Phys. Rev. A
- Phys. Rev. A
- 2005
Phys. Rev. A
- Phys. Rev. A
- 2005
Phys. Rev. Lett
- Phys. Rev. Lett
- 2005
Phys
- Rev. A 65, 062324 (2002); H. F. Hofmann and S. Takeuchi, Phys. Rev. A 66, 024308 (2002); J. L. O’Brien, G. J. Pryde, A. G. White, T. C. Ralph, and D. Branning, Nature (London) 426, 264 (2003); J. L. O’Brien et al., Phys. Rev. Lett. 93, 080502
- 2004
Phys
- Rev. Lett. 91, 107903 (2003); M. Hein, J. Eisert, and H. J. Briegel, Phys. Rev. A 69, 062311
- 2004
Phys. Rev. Lett
- Phys. Rev. Lett
- 2004