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Search Publications

NIST Authors in Bold

Displaying 1 - 25 of 2493

Efficient production of sodium Bose-Einstein condensates in a hybrid trap

September 10, 2025
Author(s)
Ian Spielman, Stephen Eckel, Gretchen Campbell, Yanda Geng, Shouvikl Mukherjee, Swarnav Banik, Monica Gutierrez~Galan, Hector Sosa-Martinez, Madison Anderson
We describe an apparatus that efficiently produces $^23}$Na Bose-Einstein condensates (BECs) in a hybrid trap that combines a quadrupole magnetic field with a far-detuned optical dipole trap. Using a Bayesian optimization framework, we systematically

Topology and Kinetic Pathways of Colloidosome Assembly and Disassembly

September 4, 2025
Author(s)
Raymond Adkins, Joanna Robaszewski, Seungwoo Shin, Fridtjof Brauns, Leroy Jia, Ayantika Khanra, Prerna Sharma, Robert Pelcovits, Thomas Powers, Zvonimir Dogic
Liquid shells, such as lipid vesicles, emulsions, and soap bubbles, are ubiquitous throughout biology, engineered matter, and everyday life. Their creation or disintegration is defined by a singularity separating topologically distinct one-boundary

Accurate, precise pressure sensing with tethered optomechanics

August 28, 2025
Author(s)
Olivia Green, Yiliang Bao, John R. Lawall, Jason Gorman, Daniel Barker
We show that optomechanical pressure sensors with characterized density and thickness can achieve uncertainty as low as 1.1 % via comparison with a secondary pressure standard. The agreement between the secondary standard and our optomechanical sensors is

Direct detection of the ? 8.4 eV internal conversion energy of 229mTh embedded in a superconducting nanowire

August 25, 2025
Author(s)
Galen O'Neil, Kjeld Beeks, Eric Hudson, David Ray Leibrandt, Marion Mallweger, Sae Woo Nam, Sayan Patra, Gil Porat, Dileep Venkatarama Reddy, Thorsten Schumm, Stephen Schoun, Benedict Seiferle, Christian Schneider, Lars von der Wense, Peter Thirolf, Varun Verma, Jun Ye, Chuankun Zhang
We report on a direct measurement of the ∼ 8.4 eV nuclear excitation energy of the isomeric first excited state 229mTh via the internal conversion (IC) decay channel. Thermalized and mass-filtered recoiling 229mTh ions from 233U α decay are delivered to

Direct measurement of the 3P0 clock state natural lifetime in 87Sr

August 24, 2025
Author(s)
Kyle Beloy, Jonathan Dolde, Dhruva Ganapathy, Xin Zheng, Shuo Ma, Shimon Kolkowitz
Optical lattice clocks based on the narrow transition between (5s2)1S0 -(5s5p)3P0 levels in neutral strontium (Sr) are among the most precise and accurate measurement devices in existence. Although this transition is completely forbidden by selection rules

Ion Coulomb crystals: an exotic form of condensed matter

August 24, 2025
Author(s)
Giovanna Morigi, John Bollinger, Michael Drewsen, Daniel Podolsky, Efrat Shimshoni
Wigner crystals formed by laser-cooled ions in traps are unconventional condensed matter systems, characterized by interparticle distances of several micrometers and energy scales on the order of meV. Their crystalline structure emerges from the interplay

Quantum Vibro-Polaritonic Sensing

August 15, 2025
Author(s)
Peng Zheng, Stephen Semancik, Ishan Barman
Vibrational spectroscopies are pivotal in analytical methods and biomedical diagnostics owing to their singular ability to provide molecular specificity. Yet, they are intrinsically limited by weak light-matter interactions and their vulnerability to

Demonstration of a 1,820 channel microwave superconducting quantum1 interference device multiplexer for transition-edge sensor bolometers

July 15, 2025
Author(s)
John Groh, Jason Austermann, James Beall, Shannon Duff, Johannes Hubmayr, Richard Lew, Michael Link, Tammy Lucas, John Mates, Robinjeet Singh, Joel Ullom, Leila Vale, Jeffrey Van Lanen, Michael Vissers
The scalability of most transition-edge sensor arrays is limited by the multiplexing technology which combines their18 signals over a reduced number of wires and amplifiers. In this letter, we present and demonstrate a new multiplexer19 design optimized

High-Stability Single-Ion Clock with 5.5 x 10^-19 Systematic Uncertainty

July 14, 2025
Author(s)
Mason Marshall, Daniel Rodriguez Castillo, Willa Dworschack, Alexander Aeppli, Kyungtae Kim, Dahyeon Lee, William Warfield, Nicholas Nardelli, Tara Fortier, Jun Ye, David Ray Leibrandt, David Hume
We report a single-ion optical atomic clock with fractional frequency uncertainty of 5.5 x 10^-19 and frequency stability of 3.5 x 10^-16/sqrttau/s}, based on quantum logic spectroscopy of a single 27Al+ ion. A co-trapped 25Mg+ ion provides sympathetic

Integrated multi-port, multi-wavelength coherent optical source for beyond Tb/s optical links

July 10, 2025
Author(s)
Ali Pirmoradi, Jizhao Zang, Kaisarbek Omirzakhov, Zhehao Yu, Yan Jin, Scott Papp, Firooz Aflatouni
Multi-wavelength, multi-port light sources formed with a Kerr-soliton microcomb and a wavelength demultiplexer are a key part of optical links utilizing wavelength-division multiplexing. Critical and emerging technologies such as data-center connectivity

Primary activity measurement of an Am-241 solution using microgram inkjet gravimetry and decay energy spectrometry

July 7, 2025
Author(s)
Ryan Fitzgerald, Bradley Alpert, Denis Bergeron, Max Carlson, Richard Essex, Kelsey Morgan, Shinichiro N. Muramoto, Svetlana Nour, Galen O'Neil, Daniel Schmidt, Gordon Shaw, Daniel Swetz, R Verkouteren
We demonstrate a method for radionuclide assay that is spectroscopic with 100 % counting efficiency for alpha decay. Advancing both cryogenic decay energy spectrometry (DES) and drop-on-demand inkjet metrology, a solution of Am-241 was assayed for massic

Detecting ion pairing in sodium halide solutions with dielectric spectroscopy

July 1, 2025
Author(s)
Michael Woodcox, Sarah Evans, Rebecca Bone, Spencer Mattes, Avik Mahata, Aaron Hagerstrom, Chris Muzny, Ravishankar Sundararaman, Kathleen Schwarz, Angela Stelson
The dielectric response of an ionic solution is determined by the diffusion of ions in solution, the response of solvent molecules and the intermolecular interactions between solvent, cations and anions. While the ionic diffusion and solvent responses are

Impact of Ni-like metastable states and hyperfine quenching on charge state distribution in an EBIT

June 30, 2025
Author(s)
Chowdhury Abrar Faiyaz, Endre Takacs, Timothy Burke, FNU Dipti, Galen O'Neil, Adam Hosier, Hunter Staiger, Joseph Tan, Yuri Ralchenko
We show the effects of ladder ionization and hyperfine quenching on charge state distributions and spectral features of ions in electron beam ion trap (EBIT) devices. Ladder ionization with intermediate excitation of metastable states proceeds at lower

Advanced Characterization of the Cure Kinetics of a Liquid Encapsulant

June 26, 2025
Author(s)
Anthony Kotula, Ran Tao, Jianwei Tu, Young Lee, Gale Holmes
Liquid encapsulants are versatile packaging materials that provide electrical insulation and mechanical protection for microelectronic devices. As more advanced encapsulants are formulated to address modern packaging needs, advanced characterization

Dynamical structure factor from weak measurements

June 25, 2025
Author(s)
Emine Altuntas, Rosaria Gabriella Lena, Stuart Flannigan, Ian Spielman, Andrew Daley
Much of our knowledge of quantum systems is encapsulated in the expectation value of Hermitian operators, experimentally obtained by averaging projective measurements. However, dynamical properties are often described by products of operators evaluated at

Blackbody radiation Zeeman shift in Rydberg atoms

June 23, 2025
Author(s)
Kyle Beloy, Benjamin Hunt, Roger Brown, Tobias Bothwell, Youssef Hassan, Jacob Siegel, Tanner Grogan, Andrew Ludlow
We consider the Zeeman shift in Rydberg atoms induced by room-temperature blackbody radiation (BBR). BBR shifts to the Rydberg levels are dominated by the familiar BBR Stark shift. However, the BBR Stark shift and the BBR Zeeman shift exhibit different

First direct search for light dark matter interactions in a transition-edge sensor

June 23, 2025
Author(s)
Christina Schwemmbauer, Adriana Lita, Yonit Hochberg, Axel Lindner, Friederike Januschek, Manuel Meyer, Benjamin Lehmann
We propose the use of transition-edge sensor (TES) single-photon detectors as a simultaneous target and sensor for direct dark matter searches, and report results from the first search of this kind. We perform a 489 h science run with a TES device
Displaying 1 - 25 of 2493
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