Iqm Finland Oy

Matti Partanen

Mikko Möttönen

Kuan Yen Tan

A circuit assembly for cooling a quantum electrical device, use of said circuit assembly, a system and a method for cooling a quantum electric device are provided. The circuit assembly comprises a quantum electric device to be cooled, at least one normal-metal-insulator-superconductor (NIS) tunnel junction electrically connected to the quantum electric device and at least one superconductive lead for supplying a drive voltage Vfor said at least one NIS tunnel junction. The quantum electric device is cooled when the voltage Vis supplied to at least one NIS tunnel junction, said voltage Vbeing equal to or below the voltage NΔ/e, where N=1 or N=2, N is the number of NIS tunnel junctions electrically coupled in series with the means for generating the voltage, Δ is the energy gap in the superconductor density of states, and e is the elementary charge.

Circuit assembly, a system and a method for cooling quantum electric devices

A circuit assembly for cooling a quantum electrical device, use of said circuit assembly, a system and a method for cooling a quantum electric device are provided. The circuit assembly comprises a quantum electric device to be cooled, at least one normal-metal-insulator-superconductor (NIS) tunnel junction electrically connected to the quantum electric device and at least one superconductive lead for supplying a drive voltage Vfor said at least one NIS tunnel junction. The quantum electric device is cooled when the voltage Vis supplied to at least one NIS tunnel junction, said voltage Vbeing equal to or below the voltage N&#x394;/e, where N=1 or N=2, N is the number of NIS tunnel junctions electrically coupled in series with the means for generating the voltage, &#x394; is the energy gap in the superconductor density of states, and e is the elementary charge.

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Espoo, Finland

Matti Partanen