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 Verifying entanglement by attempting to undo it with ultra-broadband bi-photons


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We observe at record-high speed the nonclassical nature of ultra-broadband bi-photons, reducing the measurement time by three orders of magnitude compared to previous techniques. We measure the quantum state of the broadband bi-photons, amplitude and phase, with a pairwise -Mach-Zehnder- quantum interferometer, where bi-photons that are generated in one nonlinear crystal are enhanced constructive interference or diminished destructive interference in another crystal, depending on the bi-photon phase. We verify the quantum nature of the interference by observing the dependence of the fringe visibility on internal loss. Since destructive interference is equivalent to an attempt to undo in the second crystal by up-conversion the entanglement created in the first crystal by down-conversion, the fringe visibility is a quantum measure for the purity of the broadband bi-photons quantum state. The measurement speed-up is due to the large homodyne-like gain from the strong pump 10^7-10^9 in the bi-photon up-conversion efficiency, which enables the use of simple photo-detection of the full, ultra-high photon flux instead of coincidence counting.



Autor: Yaakov Shaked; Roey Pomerantz; Avi Peer

Fuente: https://archive.org/







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