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@InProceedings{kuzikov:napac2019-weplm21,
author = {S.V. Kuzikov and S.P. Antipov and P.V. Avrakhov and E. Gomez},
title = {{High-Quality Resonators for Quantum Information Systems}},
booktitle = {Proc. NAPAC'19},
pages = {690--693},
paper = {WEPLM21},
language = {english},
keywords = {SRF, cavity, controls, cryogenics, photon},
venue = {Lansing, MI, USA},
series = {North American Particle Accelerator Conference},
number = {4},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2019},
issn = {2673-7000},
isbn = {978-3-95450-223-3},
doi = {10.18429/JACoW-NAPAC2019-WEPLM21},
url = {http://jacow.org/napac2019/papers/weplm21.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM21},
abstract = {We analyze ultra-high-quality factor resonators for quantum computer architectures. As qubit operation requires external DC fields, we started our study with a conventional closed copper cavity which naturally allows external magnetic field. In order to increase quality factor and to keep DC magnetic field control at a level less than critical field, an open SRF resonator promises much higher quality. The next step resonator is a photonic band gap (PBG) resonator. This resonator allows easy external either magnetic or electric field control. It consists of a periodic 3D set of sapphire rods assembled between two superconducting plates. The PBG resonator exploits unique properties of the crystalline sapphire. Tangent delta for sapphire in X-band is reported at 10⁻⁹ ’ 10-10 at 4 K. That is why, the Q-factor of the sapphire PBG resonator can be expected as high as 10 billions at mK temperatures which provides long relaxation times (dephasing etc.). The established PBG design implies obtaining a large Purcell factor, i.e. large ratio of quality to mode volume which is important parameter to establish strong interaction of a qubit with the cavity mode rather than RF noise.},
}