Optimal Configurations for Normal-Metal Traps in Transmon Qubits

Hosseinkhani, A.; Riwar, R. -P.; Schoelkopf, R.  J.; Glazman, L.  I.; Catelani, G.

doi:10.1103/physrevapplied.8.064028

Optimal Configurations for Normal-Metal Traps in Transmon Qubits

Journal Article · Tue Dec 26 00:00:00 EST 2017 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.8.064028· OSTI ID:1540698

Hosseinkhani, A. ^[1]; Riwar, R. -P. ^[2]; Schoelkopf, R. J. ^[3]; Glazman, L. I. ^[3]; Catelani, G. ^[4]

Forschungszentrum Juelich (Germany). JARA-Inst. for Quantum Information; RWTH Aachen Univ. (Germany). JARA-Inst. for Quantum Information; DOE/OSTI
Forschungszentrum Juelich (Germany). JARA-Inst. for Quantum Information; Yale Univ., New Haven, CT (United States)
Yale Univ., New Haven, CT (United States)
Forschungszentrum Juelich (Germany). JARA-Inst. for Quantum Information

Controlling quasiparticle dynamics can improve the performance of superconducting devices. For example, it has been demonstrated effective in increasing the lifetime and stability of superconducting qubits. In this work, we study how to optimize the placement of normal-metal traps in transmon-type qubits. When the trap size increases beyond a certain characteristic length, the details of the geometry and trap position, and even the number of traps, become important. We discuss for some experimentally relevant examples how to shorten the decay time of the excess quasiparticle density. Moreover, we show that a trap in the vicinity of a Josephson junction can significantly reduce the steady-state quasiparticle density near that junction, thus, suppressing the quasiparticle-induced relaxation rate of the qubit. Such a trap also reduces the impact of fluctuations in the generation rate of quasiparticles, rendering the qubit more stable.

View Accepted Manuscript (DOE)

Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: REA; US Army Research Office (ARO); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER46482

OSTI ID:: 1540698

Alternate ID(s):: OSTI ID: 1414885

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 8; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Phonon traps reduce the quasiparticle density in superconducting circuits Henriques, Fabio; Valenti, Francesco; Charpentier, Thibault Applied Physics Letters, Vol. 115, Issue 21 https://doi.org/10.1063/1.5124967	journal	November 2019
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Non-equilibrium quasiparticles in superconducting circuits: photons vs. phonons Catelani, Gianluigi; Basko, Denis SciPost Physics, Vol. 6, Issue 1 https://doi.org/10.21468/scipostphys.6.1.013	journal	January 2019
Digital coherent control of a superconducting qubit Leonard, Edward; Beck, Matthew A.; Nelson, Jj arXiv https://doi.org/10.48550/arxiv.1806.07930	text	January 2018
Phonon traps reduce the quasiparticle density in superconducting circuits Henriques, Fabio; Valenti, Francesco; Charpentier, Thibault arXiv https://doi.org/10.48550/arxiv.1908.04257	text	January 2019

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