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Single-junction quantum-circuit refrigerator

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journal contribution
posted on 21.09.2022, 11:33 authored by Vasilii Vadimov, Arto Viitanen, Timm Mörstedt, Tapio Ala-NissilaTapio Ala-Nissila, Mikko Möttönen
We propose a quantum-circuit refrigerator (QCR) based on photon-assisted quasiparticle tunneling through a single normal-metal–insulator–superconductor (NIS) junction. In contrast to previous studies with multiple junctions and an additional charge island for the QCR, we directly connect the NIS junction to an inductively shunted electrode of a superconducting microwave resonator making the device immune to low-frequency charge noise. At low characteristic impedance of the resonator and parameters relevant to a recent experiment, we observe that a semiclassical impedance model of the NIS junction reproduces the bias voltage dependence of the QCR-induced damping rate and frequency shift. For high characteristic impedances, we derive a Born–Markov master equation and use it to observe significant non-linearities in the QCR-induced dissipation and frequency shift. We further demonstrate that, in this regime, the QCR can be used to initialize the linear resonator into a non-thermal state even in the absence of any microwave drive.

Funding

Quantum Environment Engineering for Steered Systems

European Research Council

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Scalable fabrication process for quantum-circuit refrigerators

European Research Council

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Academy of Finland under Grant No. 318937 and under its Centres of Excellence Program (Project Nos. 312300 and 312298)

Finnish Cultural Foundation

History

School

  • Science

Department

  • Mathematical Sciences

Published in

AIP Advances

Volume

12

Issue

7

Publisher

AIP Publishing

Version

VoR (Version of Record)

Rights holder

© Author(s)

Publisher statement

This is an Open Access article published by AIP Publishing. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Acceptance date

02/06/2022

Publication date

2022-07-01

Copyright date

2022

eISSN

2158-3226

Language

en

Depositor

Prof Tapio Ala-Nissila. Deposit date: 21 September 2022

Article number

075005