Experimental Proof of Quantum Nonlocality without Squeezing

Details Experimental Proof of Quantum Nonlocality without Squeezing Experimental Proof of Quantum Nonlocality without Squeezing

2006-08-28

arxiv.org/abs/quant-ph/0608215v1

Phys. Rev. Lett. 98, 260404 (2007)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

It is shown that the ensemble $\{p (\alpha),|\alpha>|\alpha^*>\}$ where $p (\alpha)$ is a Gaussian distribution of finite variance and $| \alpha>$ is a coherent state can be better discriminated with an entangled measurement than with any local strategy supplemented by classical communication. Although this ensemble consists of products of quasi-classical states, it exhibits some quantum nonlocality. This remarkable effect is demonstrated experimentally by implementing the optimal local strategy together with a joint nonlocal strategy that yields a higher fidelity.

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