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Physics

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Displaying 251 - 275 of 4525

Systematic Improvements in Transmon Qubit Coherence enabled by Niobium Surface Encapsulation

June 14, 2023
Author(s)
Mustafa BAL, Akshay Murthy, Francesco Crisa, Shaojiang Zhu, Florent Lecocq, Joe Aumentado, Joel Ullom, Pete Hopkins
We present a novel transmon qubit fabrication technique that yields systematic improvements in T1 coherence times. In this study, the devices are fabricated using a novel encapsulation strategy that involves passivating the surface of niobium and thereby

A chip-scale atomic beam clock

June 13, 2023
Author(s)
Gabriela Martinez, Chao Li, Alexander Staron, John Kitching, Chandra Raman, William McGehee
We demonstrate a passively pumped, chip-scale atomic beam clock fabricated using a stack of silicon and glass wafers. The device could additionally serve as a platform for compact atom interferometers and other future quantum sensors.

Feedback cooled Bose-Einstein condensation: near and far from equilibrium

June 13, 2023
Author(s)
Ian Spielman, Hilary Hurst, Evan Yamaguchi
Continuously measured interacting quantum systems almost invariably heat, causing loss of quantum coherence. Here we study Bose-Einstein condensates (BECs) subject to repeated weak measurement of the atomic density and describe several protocols for

An ultra-low noise bipolar current source

June 6, 2023
Author(s)
Ian Spielman, Alessandro Restelli, Mingshu Zhao, Junheng Tao, Qiyu Liang
The precise control of dc magnetic fields is crucial in wide range of experimental platforms, from ultracold quantum gases, nuclear magnetic resonance, to precision measurements. In each of these cases the Zeeman effect causes quantum states to shift in

Calibration strategy of the PROSPECT-II detector with external and intrinsic sources

June 1, 2023
Author(s)
Hans Mumm, Denis E. Bergeron, Mark Tyra, Jerome LaRosa, Svetlana Nour, PROSPECT Collaboration
This paper presents an energy scale calibration scheme for an upgraded reactor antineutrino detector in the Precision Reactor Oscillation and Spectrum Experiment (PROSPECT). The PROSPECT collaboration is preparing the upgraded detector, PROSPECT-II (P-II)

Simulation For All: The Atomic, Molecular, and Optical Science Gateway

June 1, 2023
Author(s)
kathryn hamilton, klaus bartschat, nicolas douguet, sudhakar pamidighantam, robert lucchese, Barry I. Schneider
A challenge facing the Atomic, \hboxMolecular}, and Optical Science (AMOS) community is the lack of a coordinated approach to using and sharing the computational tools and data that have grown organically in the theoretical community. The Atomic, Molecular

In Vivo Quantitative MRI T1 and T2 Measurements of the Human Brain at 0.064 T

May 20, 2023
Author(s)
Kalina Jordanova, Michele Martin, Stephen Ogier, Megan Poorman, Katy Keenan
Object : Tissue relaxation of the brain is measured in vivo at 0.064 T. This work contributes to research efforts targeted at measuring quantitative magnetic resonance imaging properties of the human body at lower field strengths, thereby increasing the

Nonlinear Networks for Arbitrary Optical Synthesis

May 19, 2023
Author(s)
Jennifer Black, Zachary Newman, Su-Peng Yu, David Carlson, Scott Papp
Nonlinear wavelength conversion is a powerful control of light, especially when implemented at the nanoscale with integrated photonics. However, strict energy conservation and phase-matching requirements constrain the converted output. To overcome these

Near Zero Field Magnetoresistance Spectroscopy: A New Tool in Semiconductor Reliability Physics

May 15, 2023
Author(s)
Patrick Lenahan, Elias Frantz, Sean King, Mark Anders, Stephen Moxim, James P Ashton, Kenneth Myers, Michael Flatte, Nicholas Harmon
A relatively simple addition to many widely utilized semiconductor device characterization techniques can allow one to identify much of the atomic scale structure of point defects which play important roles in the electronic properties of the devices under