![]() ![]() The scientists integrated the platform with deterministic solid-state single photon sources using quantum dots in nanophotonic waveguides. In a new report now published in Science Advances, Patrik Sund and a research team at the center of hybrid quantum networks at the University of Copenhagen, and the University of Münster developed an integrated photonic platform with thin-film lithium niobate. Such platforms rely on low-loss, high-speed, reconfigurable circuits and near-deterministic resource state generators. Scalable photonic quantum computing architectures require photonic processing devices. Insets: Coincidence histograms for three different applied voltages. The HOM visibility of the quantum interference is determined from a curve fit (orange line) to be 92.7 ± 0.7%. The error bars are estimated from Poissonian statistics and are smaller than the data points. Minima and maxima in the observed HOM fringe correspond to applied phases of ϕ min = π/2 + kπ and ϕ max = kπ, respectively, with k an integer number. (B) Recorded coincidence data at zero time delay (shaded red areas in the insets) for varying applied voltages. The output photons are collected via the same fiber array and routed to SNSPDs for coincidence detection. Controlling the delay on one of the demultiplexer arms ensures that the photon pairs arrive at the device simultaneously, and fiber polarization controllers are used to optimize coupling into the TE mode. The photons are subsequently collected into fibers and injected into the LNOI chip by a fiber array. ![]() ![]() Photons generated by a QD SPS are sent into a two-mode demultiplexer consisting of a resonantly enhanced EOM and a polarizing beam splitter (PBS). Measurement of on-chip quantum interference. ![]()
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