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We have experimentally demonstrated a decoy-state quantum key distribution scheme (QKD) with a heralded single-photon source based on parametric down-conversion. What we used is a one-way BB84 protocol with a four-state and one-detector phase-coding scheme.
We report the generation of time-energy entangled paired photons with subnatural linewidths and controllable temporal lengths. The photons are generated using EIT and slow light in a high optical depth two-dimensional MOT.
Propagation of a quantized optical field through a thick sample of two-level atoms, considering the complete Zeeman sublevel structure, is theoretically investigated. Squeezing and entanglement between orthogonal polarization components is predicted for the transmitted field.
We demonstrate a new technique of efficient, time-resolved, infrared single-photon detection using non collinearly phase-matched frequency upconversion by an ultrafast pump, allowing nearly background-free sub-picosecond characterization of 1582-nm time anti-correlated entangled photons.
We analyze the squeezing and entanglement properties of the two-mode light produced by a composite system consists of a nondegenerate three-level laser and a parametric amplifier employing the pertinent master equation. It so turns out that the two-mode light is in a highly squeezed and entangled state.
We present reconstructions of Wigner distributions for the polarization state of three indistinguishable photons on the generalized Poincare sphere. We study a variety of states including coherent, phase and NOON states.
Entangled photons can be generated on demand in a novel scheme involving unitary time reordering of the photons emitted in a radiative decay. This scheme can be applied to the biexciton cascade in quantum dots.
We implement entanglement concentration by the Schmidt projection protocol, known for its optimal efficiency for large number of qubits, using photon pairs entangled in polarization and momentum and employing single-photon two-qubit quantum logic.
We present our results on fluorescence and photon statistics of quantum dots. We show evidence for photon antibunching and cross-correlation measurements within the biexciton-exciton cascade using a new set-up. We also discuss directions towards a demonstration of time-bin entangled photons from a single dot.
We investigate the topological phase associated with the SO(3) representation in terms of maximally entangled states. An experimental demonstration of this topological phase is provided for polarization and spatial mode transformations of a laser beam.
We have observed two-photon interference behind Youngpsilas double slit with unprecedented signal/noise ratiopsilas. We demonstrate the complementarity between quantum entanglement in the two-photon field and optical coherence in the projected one-photon field for three different types of illumination: far-field, near-field, and intermediate illumination.
We demonstrate experimental Heisenberg-limited scaling of the variance in optical phase measurements. Our algorithm replaces entangled states - often thought essential for Heisenberg scaling - with single photons, multiple phase shift passes, and adaptive measurement.
This work describes the implementation of a compiled version of Shor's algorithm in a photonic system by utilizing single photons and by employing the nonlinearity induced by measurement. This study also demonstrates the core processes, coherent control, and resultant entangled states that are required in a full-scale implementation of Shor's algorithm. Results show that the performance of quantum...
We experimentally prepare the quadripartite box cluster entangled states using a pair of Einstein-Podolsky-Rosen entangled optical beams and propose a scheme to demonstrate CNOT gate of continuous variables based on the prepared box cluster states.
We pass twin-photons through rotatable angular phase plates, and detect entanglement that has a continuously variable angular dimensionality D. Experimentally, D was varied from 2 to 6 and values up to 50 are practically feasible.
We report entanglement generation in atomic quantum memories via deterministic mapping of photonic entanglement. The atomic entanglement is retrieved back into photon modes after a programmable storage time, with an overall efficiency of 17%.
We review the merits of using fiber as a nonlinear media for production of correlated and entangled photon pairs for quantum information applications and we present history, status, and fruits of efforts in this area.
We present the first experimental generation of 1.5-mum band polarization entanglement based on spontaneous four-wave mixing in a silicon wire waveguide. Two-photon interference fringes with >83% visibilities were successfully obtained.
We demonstrate a bright, narrowband, compact single-crystal source of polarization entangled photon pairs at non-degenerate wavelength. This work is instrumental for quantum key distribution and entanglement transfer from photonic to atomic qubits.
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