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We describe a scalable nanocavity array, with single quantum dots, for universal single-operation N-qubit quantum gate. A single two-level system controls the lineshapes, departing from optical-analog of electromagnetically-induced-transparency, with high fidelity and low photon loss.
The nonlinear dynamics of a classical photon pulse occurring at a two-sided cavity QED system in the weak-coupling regime is investigated theoretically. It is shown that this system functions as a single-photon filter.
We report the temporal shaping and nonlocal control of a heralded single-photon wave packet, conditionally prepared by detecting the idler trigger photon of the signal-idler photon pair born in the process of spontaneous parametric down-conversion.
We are developing an experimental setup to deterministically create single photons using spontaneous downconversion. We expect our source to output a single photon with a probability of 70%, and two photons with less than 3%.
We present the first quantum tomography of a detector, using as examples an avalanche photodiode and a photon-number resolving detector. The resulting POVM set agrees well with one derived from a model of the detector.
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 describe a complete continuous variable quantum key distribution setup, reaching more than 2 kbit/s over 25 km. Time-multiplexing is used, and reconciliation is performed using fast and efficient LDPC error correcting codes.
We report an experiment on preparation and characterization of general four-dimensional quantum states using ultrafast-pumped frequency-nondegenerate spontaneous parametric down-conversion. We also discuss two additional experimental schemeswhich offermore complete control of the state purity and entropy.
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 test local realistic and non-local realistic theories using a fiber-based source of polarization-entangled photons. Our measurements violate local (certain non-local) hidden-variable theories by 15 (Leggett, A.) standard deviations.
Quantum networks require the reliable encoding of quantum information in narrow-band single photons which couple efficiently to transitions in atomic ensembles. We show time-bin encoding for photons of 10 MHz width via unbalanced Michelson interferometers and show the applicability of our scheme in a quantum key distribution experiment.
We demonstrate the preservation of entanglement of an energy-time entangled biphoton through a slow light medium. After delay of one photon by ~1.3 correlation lengths, the 1.3 THz biphoton still violates a Bell inequality.
We demonstrate a fibre implementation of a controlled-NOT gate using a fibre source of heralded single photons and three partially polarising couplers. We then estimate the bounds for the quantum process fidelity of this gate.
Recent experiments towards deterministic quantum information processing with single atoms and single photons in a high-finesse optical cavity are discussed, including a single-photon server and an atom-photon interface.
We design photonic crystal microcavities in diamond films for applications in quantum information yielding high quality factors Q>66000 and small mode volume Vap1.1(lambda/n)3. The calculated quality factors show a strong dependence on material absorption.
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