Heat Transfer For Superconducting Integrated Circuits At Millikelvin Temperatures
First Claim
1. A heat exchanging apparatus for superconducting integrated circuits operating at milliKelvin temperatures, the apparatus comprising:
- a substrate having a first surface and a second surface opposite from each other, the first surface being coupled to a dissipative element having at least two electrical terminals; and
a thermal micro-via positioned in physical contact with a portion of the dissipative element and extending towards the second surface in a perpendicular direction;
wherein at least a portion of the substrate is maintained at a temperature of less than 100 milliKelvin.
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Abstract
Heat transfer is known to be a concern when scaling up a quantum computer. Some basic superconducting devices may dissipate some energy when switched and may interface in close proximity with the qubits. Highly conductive thermal vias may be used to transport hot electrons away from the qubits and into liquid 3He, which has relatively good bulk heat transport properties, such as relatively high thermal conductivity and heat capacity, at milliKelvin temperatures. Large Kapitza resistance between solids and liquid helium may present an issue getting the heat from the thermal vias to the liquid helium. However, Kapitza resistance may be minimized by using a porous open-cell metal ‘sponge’ having very high internal surface area per unit volume.
51 Citations
20 Claims
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1. A heat exchanging apparatus for superconducting integrated circuits operating at milliKelvin temperatures, the apparatus comprising:
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a substrate having a first surface and a second surface opposite from each other, the first surface being coupled to a dissipative element having at least two electrical terminals; and a thermal micro-via positioned in physical contact with a portion of the dissipative element and extending towards the second surface in a perpendicular direction; wherein at least a portion of the substrate is maintained at a temperature of less than 100 milliKelvin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A heat exchanging apparatus for superconducting integrated circuits operating at milliKelvin temperatures, the apparatus comprising:
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one or more dissipative elements; a substrate for providing electrical insulation for the one or more dissipative elements; one or more thermal micro-vias for transporting heat through the substrate and away from the one or more dissipative elements; and a liquid helium bath for transporting heat from the one or more thermal micro-vias. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A heat exchanging apparatus for superconducting integrated circuits operating at milliKelvin temperatures, the apparatus comprising:
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a substrate having a first surface and a second surface opposite from each other, the first surface being coupled to a dissipative element having at least two electrical terminals; a thermal micro-via positioned in physical contact with a portion of the dissipative element and extending toward the second surface in a perpendicular direction; and a heat spreader being coupled to the thermal micro-via and extending from the second surface. - View Dependent Claims (20)
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Specification