B
Bethany Niedzielski
Researcher at Massachusetts Institute of Technology
Publications - 56
Citations - 1321
Bethany Niedzielski is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Qubit & Josephson effect. The author has an hindex of 14, co-authored 41 publications receiving 668 citations. Previous affiliations of Bethany Niedzielski include Michigan State University.
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Journal ArticleDOI
Controllable 0–π Josephson junctions containing a ferromagnetic spin valve
Eric C. Gingrich,Bethany Niedzielski,Joseph A. Glick,Yixing Wang,Yixing Wang,Donald L. Miller,Reza Loloee,William P. Pratt,Norman O. Birge +8 more
TL;DR: The phase state of a Josephson junction containing two ferromagnetic layers can be toggled between 0 and π by changing the relative orientation of the two magnetizations as mentioned in this paper. But the phase state is invariant to the thickness of the material.
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Impact of ionizing radiation on superconducting qubit coherence.
Antti Vepsäläinen,Amir Karamlou,John L. Orrell,Akshunna S. Dogra,Akshunna S. Dogra,Ben Loer,Francisca Vasconcelos,David Kim,Alexander Melville,Bethany Niedzielski,Jonilyn Yoder,Simon Gustavsson,Joseph A. Formaggio,B. A. VanDevender,William D. Oliver +14 more
TL;DR: In this paper, the effect of ionizing radiation from environmental radioactive materials and cosmic rays contributes to the observed difference in the density of the broken Cooper pairs, referred to as quasiparticles, which is orders of magnitude higher than the value predicted at equilibrium by the Bardeen-Cooper-Schrieffer theory.
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Waveguide Quantum Electrodynamics with Giant Superconducting Artificial Atoms
Bharath Kannan,Max Ruckriegel,Daniel Campbell,Anton Frisk Kockum,Jochen Braumüller,David Kim,Morten Kjaergaard,Philip Krantz,Alexander Melville,Bethany Niedzielski,Antti Vepsäläinen,Roni Winik,Jonilyn Yoder,Franco Nori,Terry P. Orlando,Simon Gustavsson,William D. Oliver +16 more
TL;DR: In this paper, the authors realized a giant atom by coupling small atoms to a waveguide at multiple, but well separated, discrete locations, enabling tunable atom-waveguide couplings with large on-off ratios and a coupling spectrum that can be engineered by device design.
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Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
Youngkyu Sung,Leon Ding,Jochen Braumüller,Antti Vepsäläinen,Bharath Kannan,Morten Kjaergaard,Ami Greene,Gabriel Samach,Chris McNally,David Kim,Alexander Melville,Bethany Niedzielski,Mollie Schwartz,Jonilyn Yoder,Terry P. Orlando,Simon Gustavsson,William D. Oliver +16 more
TL;DR: In this paper, a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control is presented, and the authors demonstrate CZ and $ZZ$-free iSWAP gates with two-qubit interaction fidelities of 99.76 \pm 0.07$% and 99.87 \ pm 0.23$%, respectively.
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Spin-valve Josephson junctions for cryogenic memory
Bethany Niedzielski,T. J. Bertus,Joseph A. Glick,Reza Loloee,William P. Pratt,Norman O. Birge +5 more
TL;DR: In this article, a phase-controllable spin-valve Josephson junction with a fixed thickness of 2.0 nm and a NiFe layer of thickness varying between 1.1 and 1.8 nm was studied.