A5035458296- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Applications
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Electrodynamics and Casimir Effect
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Advanced NMR Techniques and Applications
- Quantum optics and atomic interactions
- Radioactive Decay and Measurement Techniques
- Quantum Computing Algorithms and Architecture
- Advanced Frequency and Time Standards
- Cosmology and Gravitation Theories
- Experimental and Theoretical Physics Studies
- Thermal Radiation and Cooling Technologies
- Advanced Thermodynamics and Statistical Mechanics
- Nuclear physics research studies
- Advanced MRI Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Quantum Chromodynamics and Particle Interactions
- Non-Destructive Testing Techniques
- High-pressure geophysics and materials
Yale University
2014-2025
Institut Laue-Langevin
1988-2024
Los Alamos National Laboratory
2002-2019
University of Washington
1992-2013
North Carolina State University
2005-2008
National Institute of Standards and Technology
2005-2008
Harvard University
1996-2008
Triangle Universities Nuclear Laboratory
2006
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2005
Harvard University Press
2005
The vacuum stress between closely spaced conducting surfaces, due to the modification of zero-point fluctuations electromagnetic field, has been conclusively demonstrated. measurement employed an electromechanical system based on a torsion pendulum. Agreement with theory at level 5% is obtained.
The Casimir force, which is the attraction of two uncharged material bodies due to modification zero-point energy associated with electromagnetic modes in space between them, has been measured per cent-level accuracy a number recent experiments. A review theory force and its corrections for real materials finite temperature are presented this report. Applications practical problems discussed.
Four decades after its prediction, the axion remains most compelling solution to Strong-CP problem and a well-motivated dark matter candidate, inspiring host of elegant ultrasensitive experiments based on axion-photon mixing. This report reviews experimental situation several fronts. The microwave cavity experiment is making excellent progress in search for axions microelectronvolt range may be plausibly extended up 100 mu eV. Within past years however, it has been realized that are...
We report on the first results from a new microwave cavity search for dark matter axions with masses above $20~\mu\text{eV}$. exclude axion models two-photon coupling $g_{a\gamma\gamma} \gtrsim 2\times10^{-14}~\text{GeV}^{-1}$ over range $23.55~\mu\text{eV} < m_a 24.0~\mu\text{eV}$. These represent two important achievements. First, we have reached cosmologically relevant sensitivity an order of magnitude higher in mass than any existing limits. Second, by incorporating dilution refrigerator...
We report on the results from a search for dark matter axions with HAYSTAC experiment using microwave cavity detector at frequencies between 5.6-5.8$\, \rm Ghz$. exclude axion models two photon coupling $g_{a\gamma\gamma}\,\gtrsim\,2\times10^{-14}\,\rm GeV^{-1}$, factor of 2.7 above benchmark KSVZ model over mass range 23.15$\,<\,$$m_a \,$<$\,$24.0$\,\mu\rm eV$. This doubles reported in our previous paper. achieve near-quantum-limited sensitivity by operating temperature $T<h\nu/2k_B$ and...
A search for dark matter axions with masses $>10\text{ }\text{ }\mathrm{\ensuremath{\mu}}\mathrm{eV}/{\mathrm{c}}^{2}$ has been performed using the HAYSTAC experiment's squeezed state receiver to achieve subquantum limited noise. This work includes details of design and operation experiment previously used in mass ranges 16.96--17.12 $17.14--17.28\text{ (4.100--4.140 GHz 4.145--4.178 GHz) as well upgrades facilitate an extended at higher masses. These include improvements data acquisition...
A working free-space quantum key distribution system has been developed and tested over an outdoor optical path of $\ensuremath{\sim}1\mathrm{km}$ at Los Alamos National Laboratory under nighttime conditions. Results show that can provide secure real-time between parties who have a need to communicate secretly. Finally, we examine the feasibility surface satellite distribution.
We report a new measurement of parity nonconserving (PNC) optical rotation near the 1.28 $\ensuremath{\mu}$m, ${6P}_{1/2}\ensuremath{\rightarrow}{6P}_{3/2}$ magnetic dipole transition in thallium. find ratio PNC $E1$ amplitude to $M1$ be $R\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(\ensuremath{-}14.68\ifmmode\pm\else\textpm\fi{}0.17)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$, which within present uncertainty atomic theory yields thallium weak charge...
The nuclear magnetic resonance frequencies of $^{201}\mathrm{Hg}$ (I=(3/2)) and $^{199}\mathrm{Hg}$ (I=(1/2)) have been compared by use optically pumped atomic light absorption oscillators to see if the relative depend on orientation quantization axis in space. null result \ensuremath{\delta}${\ensuremath{\nu}}_{2}$5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$ Hz improves over 3 orders magnitude recent limits any quadrupolar interactions violating spatial isotropy, can...
1. Atomic Structure 2. Atoms in External Fields 3. Interaction of with Light 4. 5. Collisions 6. Cold 7. Molecules 8. Experimental Methods 9. Miscellaneous Topics A. Units, conversion factors, and typical values B. Reference data for hydrogen alkali atoms C. Spectroscopic notation diatomic molecules D. Description polarization states light E. Euler angles rotation matrices F. The Wigner-Eckart theorem irreducible tensors G. density matrix H. Elements the Feynman diagram technique APPENDIX I:...
We describe an error-reconciliation protocol, which we call Winnow, based on the exchange of parity and Hamming's ``syndrome'' for N-bit subunits a large dataset. The Winnow protocol was developed in context quantum-key distribution offers significant advantages net higher efficiency compared to other widely used protocols within quantum cryptography community. A detailed mathematical analysis is presented practical implementations distribution; particular, information overhead required...
We report measurements of the short-range forces between two macroscopic gold-coated plates using a torsion pendulum. The force is measured for separations 0.7 $\mu$m and 7 $\mu$m, well described by combination Casimir force, including finite-temperature correction, an electrostatic due to patch potentials on plate surfaces. use our data place constraints Yukawa-type "new" predicted theories with extra dimensions. establish new best bound ranges 0.4 4 and, mediated gauge bosons propagating...
We describe in detail the analysis procedure used to derive first limits from Haloscope at Yale Sensitive Axion CDM (HAYSTAC), a microwave cavity search for cold dark matter (CDM) axions with masses above $20\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$. have introduced several significant innovations axion pioneered by Dark Matter eXperiment (ADMX), including optimal filtering of individual power spectra that constitute data set and consistent maximum likelihood combining rebinning these...
We show that at higher frequencies, and thus axion masses, single-photon detectors become competitive ultimately favored, when compared to quantum-limited linear amplifiers, as the detector technology in microwave cavity experimental searches for galactic halo dark matter axions. The crossover point this comparison is of order 10 GHz ($\ensuremath{\sim}40\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$), not far above frequencies current searches.
Quantum key distribution (QKD) has been demonstrated over a point-to-point 1.6-km atmospheric optical path in full daylight. This record transmission distance brings QKD step closer to surface-to-satellite and other long-distance applications.
The relative frequency of Hg and Cs mgnetometers is monitored as a function the orientation applied magnetic field with respect to fixed stars. observed stability limits electron nucleon local Lorentz invariance violating effects less than 200 \ensuremath{\mu}Hz 110 nHz, respectively. These results represent an improvement over best published by order magnitude for factor 240 nuclear effects. result also sets upper limit eV on Fermi level degenerate remnant neutrino background.
We have measured the ratio of nuclear spin-precession frequencies $^{199}\mathrm{Hg}$ and $^{201}\mathrm{Hg}$ atoms for two orientations magnetic field relative to Earth's gravitational field. find that spin-dependent component energy is less than 2.2\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}21}$ eV, a substantial improvement over previous limits. Our result provides test equivalence principle spins, sets limits on magnitude possible scalar-pseudoscalar interactions...
The Lifshitz formalism for determining the attractive force between material bodies with generalized electromagnetic susceptibility is applied numerically to gold, copper, and aluminum. deviation from perfect conductivity Casimir approximately agrees a first-order plasma model calculation at large separation, but separations corresponding frequency, deviations of over 50% are found, while corrections up second order about 10%. These results discussed in context recent measurements force.