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David P. Pappas
Researcher at National Institute of Standards and Technology
Publications - 180
Citations - 7474
David P. Pappas is an academic researcher from National Institute of Standards and Technology. The author has contributed to research in topics: Qubit & Transmon. The author has an hindex of 43, co-authored 174 publications receiving 6578 citations. Previous affiliations of David P. Pappas include IBM & University of Colorado Boulder.
Papers
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Journal ArticleDOI
Decoherence in Josephson qubits from dielectric loss.
John M. Martinis,Ken Cooper,Robert McDermott,Matthias Steffen,Markus Ansmann,Kevin Osborn,Katarina Cicak,Seongshik Oh,David P. Pappas,Raymond W. Simmonds,Clare C. Yu +10 more
TL;DR: In this paper, the authors show that a variety of microwave and qubit measurements are well modeled by loss from resonant absorption of two-level defects and demonstrate that this loss can be significantly reduced by using better dielectrics and fabricating junctions of small area.
Journal ArticleDOI
Decoherence in josephson phase qubits from junction resonators.
TL;DR: Spectroscopic data is reported that shows a level splitting characteristic of coupling between a two-state qubit and a two -level system and Rabi oscillations whose "coherence amplitude" is significantly degraded by the presence of these spurious microwave resonators.
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Reversible transition between perpendicular and in-plane magnetization in ultrathin films.
TL;DR: The magnetization in ultrathin Fe layers (2.5-3.5 atomic layers) on Cu(100) reversibly switches between perpendicular and in-plane magnetization over a temperature range of 20-30 K and shows evidence for a canted-spin configuration.
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Simultaneous state measurement of coupled Josephson phase qubits.
Robert McDermott,Robert McDermott,Raymond W. Simmonds,Matthias Steffen,Ken Cooper,Katarina Cicak,Kevin Osborn,Seongshik Oh,David P. Pappas,John M. Martinis +9 more
TL;DR: This work uses simultaneous single-shot measurement of coupled Josephson phase qubits to directly probe interaction of the qubits in the time domain and observes the antiphase oscillation of the two-qubit |01〉 and |10〉 states.
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Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
Ken Cooper,Matthias Steffen,Matthias Steffen,Robert McDermott,Raymond W. Simmonds,Seongshik Oh,D. A. Hite,David P. Pappas,John M. Martinis +8 more
TL;DR: The results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain.