Abstract: Various embodiments of the present disclosure are directed to accessing a quantum communication channel undetected and/or characterizing this communication channel based upon attempted access. An example method includes accessing a quantum communication channel transmitting one or more qubits. The method includes the introduction of a noise signal to the quantum communication channel and then applying in its absence one or more weak or variable-strength measurements to the quantum communication channel. A strength of at least one measurement of the one or more measurements is based at least in part upon the current noise signal. The method further includes obtaining information associated with the one or more qubits based on the one or more measurements.

Abstract: A system (20, 70) for water treatment includes a plurality of containers (22, 24, 26, 80) which are configured to be stacked one on another for shipment and to deployed in a row at different, respective heights at a water treatment site. Each container includes an inlet (37, 86) at a first side of the container and an outlet (88) at a second side of the container, opposite the first side. The containers are filled with substrates (36, 38, 40) configured for planting of aquatic plants (60) therein and including at least different first and second substrates for filling the first and second containers, respectively. Piping includes at least an inlet pipe (34) for connection to the inlet of a first container, a transfer pipe (64, 66) for connection between the outlet of the first container and the inlet of a second container, and an outlet pipe (41) for connection to the outlet of the second container.

Abstract: A system (20, 70) for water treatment includes a plurality of containers (22, 24, 26, 80) which are configured to be stacked one on another for shipment and to deployed in a row at different, respective heights at a water treatment site. Each container includes an inlet (37, 86) at a first side of the container and an outlet (88) at a second side of the container, opposite the first side. The containers are filled with substrates (36, 38, 40) configured for planting of aquatic plants (60) therein and including at least different first and second substrates for filling the first and second containers, respectively. Piping includes at least an inlet pipe (34) for connection to the inlet of a first container, a transfer pipe (64, 66) for connection between the outlet of the first container and the inlet of a second container, and an outlet pipe (41) for connection to the outlet of the second container.