Theory of quantum-circuit refrigeration by photon-assisted electron tunneling
Silveri, M., Grabert, H., Masuda, S., Tan, K. Y., & Möttönen, M. (2017). Theory of quantum-circuit refrigeration by photon-assisted electron tunneling. Physical Review B, 96(9), Article 094524. https://doi.org/10.1103/PhysRevB.96.094524
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Physical Review BDate
2017Copyright
© 2017 American Physical Society. Published in this repository with the kind permission of the publisher.
We focus on a recently experimentally realized scenario of normal-metal–insulator–superconductor tunnel
junctions coupled to a superconducting resonator. We develop a first-principles theory to describe the effect of
photon-assisted electron tunneling on the quantum state of the resonator. Our results are in very good quantitative
agreement with the previous experiments on refrigeration and heating of the resonator using the photon-assisted
tunneling, thus providing a stringent verification of the developed theory. Importantly, our results provide simple
analytical estimates of the voltage-tunable coupling strength and temperature of the thermal reservoir formed by
the photon-assisted tunneling. Consequently, they are used to introduce optimization principles for initialization of
quantum devices using such a quantum-circuit refrigerator. Thanks to the first-principles nature of our approach,
extension of the theory to the full spectrum of quantum electric devices seems plausible.
...


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