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We report an interferometer consisting of two spatially separated balanced Mach-Zehnder interferometers sharing a polarization entangled source. Nonlocal correlation statistics enable entanglement detection, Bell state identification, and fidelity bounding.
We exhibit high-dimensional frequency-bin entanglement from a mode-locked two-photon source via frequency-correlation measurement and Hong-Ou-Mandel interference. Generalized Bell-inequality is tested by Franson interference, showing revival interference fringes, with maximum visibility of 98.6%.
We implement a high-dimensional quantum key distribution protocol secure against collective attacks. We transform between conjugate measurement bases using group velocity dispersion. We obtain > 3 secure bits per photon coincidence.
We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and certain class of non-Gaussian states. We show that any separation in the peaks of the marginal distributions of one subsystem conditioned on two different outcomes of homodyne measurements performed on the other subsystem indicates correlation between the corresponding quadratures and hence nonzero...
Page and Wootters' mechanism of “static” time is experimentally implemented by a toy universe consisting of a polarization entangled photon pair, one of which serves as a clock to gauge the evolution of the second.
Two photons in an entangled, spatially correlated (anti-correlated) state transmitted through an Anderson disordered lattice maintain their correlation (anti-correlation) but exhibit coincidence-map speckle in the Fourier plane.
We optically demonstrate violation of the CHSH-Bell inequality and Tsirelson's bound via loss and postselection. This enables us to more easily distinguish between entangled and unentangled states, and violates information causality with the postselected data.
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