A STUDY OF DILUTION IN THE OTTAWA RIVER USING RHODAMINE B. I. NPD TO DEEP RIVER.
ABSTRACT Rhodamine B, a fluorescent dye, was used to study dilution in the Ottawa
River downstream of the NPD reactor site. Dye was injected into the NPD process
sewer for a 3-hr period and the concentration measured as it dispersed in the
river. An initial dilution of l00 was observed near the outfall. A wide, deep
section of the Ottawa River downstream of the reactor site acted as a detention
and mixing basin. Dye concentrations at the town of Deep River water intake, 16
km downriver, indicated a minimum overall dilution of the effluent of 3 x 10/sup
4/. The water velocity in this section of the Ottawa River was about 9 km/day.
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ABSTRACT: Entanglement between stationary quantum memories and photonic qubits is crucial for future quantum communication networks. Although high-fidelity spin-photon entanglement was demonstrated in well-isolated atomic and ionic systems, in the solid-state, where massively parallel, scalable networks are most realistically conceivable, entanglement fidelities are typically limited due to intrinsic environmental interactions. Distilling high-fidelity entangled pairs from lower-fidelity precursors can act as a remedy, but the required overhead scales unfavourably with the initial entanglement fidelity. With spin-photon entanglement as a crucial building block for entangling quantum network nodes, obtaining high-fidelity entangled pairs becomes imperative for practical realization of such networks. Here we report the first results of complete state tomography of a solid-state spin-photon-polarization-entangled qubit pair, using a single electron-charged indium arsenide quantum dot. We demonstrate record-high fidelity in the solid-state of well over 90%, and the first (99.9%-confidence) achievement of a fidelity that will unambiguously allow for entanglement distribution in solid-state quantum repeater networks.Nature Communications 07/2013; 4:2228. DOI:10.1038/ncomms3228 · 10.74 Impact Factor
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ABSTRACT: Among those who make a living from the science of secrecy, worry and paranoia are just signs of professionalism. Can we protect our secrets against those who wield superior technological powers? Can we trust those who provide us with tools for protection? Can we even trust ourselves, our own freedom of choice? Recent developments in quantum cryptography show that some of these questions can be addressed and discussed in precise and operational terms, suggesting that privacy is indeed possible under surprisingly weak assumptions.Nature 03/2014; 507(7493):443-7. DOI:10.1038/nature13132 · 42.35 Impact Factor
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ABSTRACT: We develop a one-step scheme for generating multiparticle entangled states between two cold atomic clouds in distant cavities coupled by an optical fiber. We show that, through suitably choosing the intensities and detunings of the fields and precisely tuning the time evolution of the system, multiparticle entanglement between the separated atomic clouds can be engineered deterministically, in which quantum manipulations are insensitive to the states of the cavity and losses of the fiber. The experimental feasibility of this scheme is analyzed based on recent experimental advances in the realization of strong coupling between cold 87Rb clouds and fiber-based cavity. This scheme may open up promising perspectives for implementing quantum communication and networking with coupled cavities connected by optical fibers.Optics Express 01/2011; 19(2):1207-16. DOI:10.1364/OE.19.001207 · 3.53 Impact Factor