Abstract: A reservoir computer. In some embodiments, the reservoir computer includes a Duffing oscillator, and a readout circuit, and the readout circuit is configured to calculate a plurality of products, each of the products being calculated by multiplying a sample, of a plurality of samples of a signal from the Duffing oscillator, by a respective weight of a plurality of weights.

Abstract: A reservoir computer. In some embodiments, the reservoir computer includes a series array of Josephson junctions, a coupling impedance, and a readout circuit. In some embodiments, the series array of Josephson junctions includes a plurality of Josephson junctions, connected in series; the coupling impedance is connected in parallel with the series array of Josephson junctions; and the readout circuit is connected to at least three nodes of the series array of Josephson junctions.

Abstract: A reservoir computer. In some embodiments, the reservoir computer includes a discrete element transmission line and a readout circuit. The discrete element transmission line may include a plurality of shunt-connected Josephson junctions and a plurality of series-connected inductors connected to the shunt-connected Josephson junctions. The readout circuit may be connected to at least three nodes of the discrete element transmission line.

Abstract: A magnetic memory system includes a superconductor circuit and one or more magnetic memory elements to store data. To write data, a driver circuit in the superconductor circuit generates a magnetic signal for transmission over a superconductor link extending between the superconductor circuit and the magnetic memory element. To read data, a sensing circuit in the superconductor circuit monitors a superconductor link extending from sensing circuit to the magnetic memory element. The magnetic memory element can be a spin-transfer type magnetic memory element.