Properties of high-quality coplanar waveguide resonators for QIP and detector applications

Lindström, Tobias; Healey, J E; Colclough, M. S.; Webster, C H; Muirhead, C. M.; Tzalenchuk, A. Ya.

doi:10.1088/1742-6596/150/5/052140

Cited by 1 publication

(1 citation statement)

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“…Importantly, this does not reduce the cooling power of the QCR, which utilizes the voltage profile. As discussed in more detail in Supplementary Note 4 , this type of straightforward improvements of the QCR are expected to allow for resonator quality factors 46 in the range of 10 6 when the QCR is inactive. Such a level of dissipation is low enough for the undisturbed operation of quantum devices in their known applications.…”

Section: Discussionmentioning

confidence: 99%

Quantum-circuit refrigerator

Tan¹,

Partanen²,

Lake³

et al. 2017

Nat Commun

115

143

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Quantum technology promises revolutionizing applications in information processing, communications, sensing and modelling. However, efficient on-demand cooling of the functional quantum degrees of freedom remains challenging in many solid-state implementations, such as superconducting circuits. Here we demonstrate direct cooling of a superconducting resonator mode using voltage-controllable electron tunnelling in a nanoscale refrigerator. This result is revealed by a decreased electron temperature at a resonator-coupled probe resistor, even for an elevated electron temperature at the refrigerator. Our conclusions are verified by control experiments and by a good quantitative agreement between theory and experimental observations at various operation voltages and bath temperatures. In the future, we aim to remove spurious dissipation introduced by our refrigerator and to decrease the operational temperature. Such an ideal quantum-circuit refrigerator has potential applications in the initialization of quantum electric devices. In the superconducting quantum computer, for example, fast and accurate reset of the quantum memory is needed.

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Section: Discussionmentioning

confidence: 99%