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AssigneeQest Quantenelektronische Systeme GmbH
InventorsNils Schopohl, Christoph Haeussler, Joerg Oppenlaender
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A device is proposed for high-resolution measurement, in particular for high-resolution absolute measurement of magnetic fields, having a network (1) of transitions (3) between superconductors (5, 6) which exhibit Josephson effects, called junctions below, the network comprising closed meshes (7, 8, 9, 10, 11, 12, 13), denoted by cells below, which in each case have junctions (3), which junctions are connected in a superconducting fashion, and at least three of these cells being connected in a superconducting and/or nonsuperconducting fashion. The object of the invention consists in further developing this device in such a way that it is possible to make absolute measurements of magnetic fields in a highly sensitive fashion. This object is achieved by virtue of the fact that the junctions (3) of the at least three cells (7, 8, 9) can be energized in such a way that a time-variant voltage drops in each case across at least two junctions of a cell, the time average of which voltage does not vanish, and in that the at least three cells are configured differently geometrically in such a way that the magnetic fluxes enclosed by the cells in the case of an existing magnetic field differ from one another in such a way that the frequency spectrum of the voltage response function has no significant Φ0-periodic component with reference to the magnetic flux.
A device for high-resolution measurement of magnetic fields, having a network of junctions between superconductors which exhibit Josephson effects, the network comprising a plurality of closed cells, each cell having at least two junctions connected in a superconducting fashion, wherein at least three of said cells are connected electrically and can be energized in such a way that a time-variant voltage drops across at least two junctions of each of said at least three cells, the time average of which voltage does not vanish, and wherein said at least three cells are configured differently geometrically in such a way that the magnetic fluxes enclosed by the cells in the case of an existing magnetic field differ from one another in such a way that a frequency spectrum of a voltage response function has no significant elementary-flux-quantum-periodic (Φ0-periodic) component with reference to the magnetic flux, and if a discrete frequency spectrum exists, the contribution of the Φ0-periodic component of the discrete frequency spectrum is not dominant by comparison with a non-Φ0-periodic component of the discrete frequency spectrum.
Dependencies are inferred from the claim text.