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Title: Optimal Configurations for Normal-Metal Traps in Transmon Qubits

Journal Article · · Physical Review Applied
 [1];  [2];  [3];  [3];  [4]
  1. Forschungszentrum Juelich (Germany). JARA-Inst. for Quantum Information; RWTH Aachen Univ. (Germany). JARA-Inst. for Quantum Information
  2. Forschungszentrum Juelich (Germany). JARA-Inst. for Quantum Information; Yale Univ., New Haven, CT (United States)
  3. Yale Univ., New Haven, CT (United States)
  4. Forschungszentrum Juelich (Germany). JARA-Inst. for Quantum Information
+ Show Author Affiliations

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.

Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC); REA; US Army Research Office (ARO)
Grant/Contract Number:
FG02-08ER46482; CIG-618258; W911NF-14-1-001; DEFG02-08ER46482
OSTI ID:
1540698
Alternate ID(s):
OSTI ID: 1414885
Journal Information:
Physical Review Applied, Vol. 8, Issue 6; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (5)

Phonon traps reduce the quasiparticle density in superconducting circuits journal November 2019
Digital Coherent Control of a Superconducting Qubit journal January 2019
Non-equilibrium quasiparticles in superconducting circuits: photons vs. phonons journal January 2019
Digital coherent control of a superconducting qubit text January 2018
Phonon traps reduce the quasiparticle density in superconducting circuits text January 2019

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
quantum information with solid state qubits
quasiparticles & collective excitations
superconductivity
low-temperature superconductors
tunnel junctions
superconducting qubits