Lectures on Quantum Optics and Quantum Information
Lectures on Quantum Optics and Quantum Information
Lectures on Quantum Optics and Quantum Information
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A last Level of Correlati<strong>on</strong>s : N<strong>on</strong>-locality<br />
Violati<strong>on</strong> of a Bell Inequality<br />
The multiple correlati<strong>on</strong>s cannot be described by a<br />
local hidden variables<br />
Fields with Gaussian statistics (Positive Wigner<br />
functi<strong>on</strong>) : can always be mapped into<br />
stochastic equati<strong>on</strong>s for fluctuating fields,<br />
which c<strong>on</strong>stitute the local « hidden » variables<br />
accounting for all the observed quantities…<br />
Single-phot<strong>on</strong> subtracti<strong>on</strong>s<br />
N<strong>on</strong>-Gaussian states with<br />
Negative Wigner functi<strong>on</strong>s<br />
A str<strong>on</strong>gly active field:<br />
Schrodinger cat states,<br />
CV qubit, distillati<strong>on</strong><br />
Hybrid Schemes<br />
Requires n<strong>on</strong>-Gaussian<br />
measurements or n<strong>on</strong>-Gaussian<br />
ressources<br />
Requires efficiency>95%, 6dB<br />
squeezing, high-purity of the<br />
initial state…<br />
And gives at most S=2.05<br />
R. Garcia-Patr<strong>on</strong> et al., Phys. Rev. Lett. 93, 130409 (2004); <strong>and</strong> many other proposals since then…
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