A5051518364- Noncommutative and Quantum Gravity Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Black Holes and Theoretical Physics
- Quantum Mechanics and Applications
- Cosmology and Gravitation Theories
- Advanced Frequency and Time Standards
- Relativity and Gravitational Theory
- Quantum Information and Cryptography
- Radioactive Decay and Measurement Techniques
- Experimental and Theoretical Physics Studies
- Photonic and Optical Devices
- Random lasers and scattering media
- Photorefractive and Nonlinear Optics
- Semiconductor Lasers and Optical Devices
- Quantum, superfluid, helium dynamics
- Quantum Electrodynamics and Casimir Effect
- Pulsars and Gravitational Waves Research
- Advanced Thermodynamics and Statistical Mechanics
- Thermography and Photoacoustic Techniques
- Crystallography and Radiation Phenomena
- Electrochemical Analysis and Applications
- History and Theory of Mathematics
- History and advancements in chemistry
General Atomics (United States)
2018
Los Alamos National Laboratory
2018
Indiana University Bloomington
2018
Massachusetts Institute of Technology
2018
Atomic Weapons Establishment
2018
University of Rochester
2018
Energetics (United States)
2018
Ohio University
2018
Lawrence Livermore National Laboratory
2015-2018
University of California, Berkeley
2010-2017
We investigate leading order deviations from general relativity that violate the Einstein equivalence principle in gravitational standard model extension. show redshift experiments based on matter waves and clock comparisons are equivalent to one another. Consideration of torsion balance tests, along with wave, microwave, optical, M\"ossbauer yields comprehensive limits spin-independent principle-violating extension terms at $10^{-6}$ level.
Historically, time measurements have been based on oscillation frequencies in systems of particles, from the motion celestial bodies to atomic transitions. Relativity and quantum mechanics show that even a single particle mass m determines Compton frequency ω(0) = mc(2)/[formula: see text] where c is speed light [formula: Planck's constant h divided by 2π. A clock referenced would enable high-precision fundamental definition second. We demonstrate such using an optical comb self-reference...
We report a joint test of local Lorentz invariance and the Einstein equivalence principle for electrons, using long-term measurements transition frequency between two nearly degenerate states atomic dysprosium. present many-body calculations which demonstrate that energy splitting these is particularly sensitive to violations both special general relativity. limit violation electrons at level ${10}^{\ensuremath{-}17}$, matching or improving best laboratory astrophysical limits by up factor...
We consider the possibility that Lorentz violation can generate differences between limiting velocities of light and charged matter. Such effects would lead to efficient vacuum Cherenkov radiation or rapid photon decay. The absence such for 104.5 GeV electrons at Large Electron Positron collider 300 photons Tevatron therefore constrains this type breakdown. Within context standard-model extension, these ideas imply an experimental bound level...
We consider the role of internal kinetic energy bound systems matter in tests Einstein equivalence principle. Using gravitational sector standard model extension, we show that stringent limits on principle violations antimatter can be indirectly obtained from using normal matter. estimate nucleons a range light atomic species Green's function Monte Carlo calculations, and for heavier Woods-Saxon model. survey sensitivities existing planned experimental principle, report new constraints at...
We propose a feasible laboratory interferometry experiment with matter waves in gravitational potential caused by pair of artificial field-generating masses. It will demonstrate that the presence these masses (and, for moving atoms, time dilation) induces phase shift, even if it does not cause any classical force. The shift is identical to produced redshift (or clocks ticking at atom's Compton frequency. In analogy Aharonov-Bohm effect electromagnetism, quantum mechanical function and forces.
Antirelaxation coatings in atomic vapor cells allow ground-state coherent spin states to survive many collisions with the cell walls. This reduction decoherence rate gives rise ultranarrow-bandwidth features electromagnetically induced transparency (EIT) spectra, which can form basis of, for example, long-time scale slow and stored light, sensitive magnetometers, precise frequency standards. Here we study, both experimentally theoretically, how Zeeman EIT contrast width paraffin-coated...
The absence of vacuum Cherenkov radiation for 104.5 GeV electrons and positrons at the LEP collider CERN combined with observed stability 300 photons Tevatron constrains deviations speed light relative to maximal attainable electrons. Within standard-model extension, limit -5.8x10(-12)<or=kappatr-4/3ce00<or=1.2x10(-11) is extracted, which sharpens previous bounds by more than 3 orders magnitude. potential further refinements this terrestrial experiments astrophysical observations discussed.
We demonstrate a slow light beam splitter using rapid coherence transport in wall-coated atomic vapor cell. show that particles undergoing random and undirected classical motion can mediate coherent interactions between two or more optical modes. Coherence, written into atoms via electromagnetically induced transparency an input signal at one transverse position, spreads out ballistic motion, is preserved by antirelaxation wall coating, then retrieved outgoing signals both the channel...
Researchers study oscillating quartz crystals to search for physics not explained by the standard model, and they recover results that are 6 orders of magnitude more precise than any previous laboratory experiment.
We demonstrate and characterize two coherent phenomena that can mitigate the effects of laser phase noise for electromagnetically induced transparency (EIT): a laser-power-broadening-resistant resonance in transmitted intensity cross correlation between EIT optical fields, resonant suppression conversion to when one-photon dominates over two-photon-detuning noise. Our experimental observations are good agreement with both an intuitive physical picture numerical calculations. The results have...
We demonstrate that Michelson-Morley tests, which detect direction-dependent anisotropies in the speed of light, can also be used to place limits upon isotropic deviations vacuum light from $c$, as described by photon-sector standard model extension parameter ${\stackrel{\texttildelow{}}{\ensuremath{\kappa}}}_{\mathrm{tr}}$. A shift is one inertial frame implies anisotropic shifts others. Using observer Lorentz covariance, we derive time-dependent variations relative resonance frequencies a...
We study the use of atom interferometers as detectors for gravitational waves in mHz - Hz frequency band, which is complementary to planned optical interferometers, such laser interferometer wave observatories (LIGOs) and Laser Interferometer Space Antenna (LISA). describe an optimized atomic interferometric sensor (AGIS), whose sensitivity proportional baseline length power 5/2, opposed linear scaling a more conservative design. Technical challenges are briefly discussed, table-top...
We show how slow-light pulse delays in realistic electromagnetically-induced-transparency (EIT) media can be determined directly from static transmission spectra. Using only the measured EIT linewidth and off-resonant transmission, absolute delay of a an optically thick, power-broadened medium simply accurately determined, while capturing more complex optical pumping behavior.
Polar-direct-drive exploding pushers are used as a high-yield, low-areal-density fusion product source at the National Ignition Facility with applications including diagnostic calibration, nuclear security, backlighting, electron-ion equilibration, and nucleosynthesis-relevant experiments. In this paper, two different paths to improving performance of platform explored: (i) optimizing laser drive, (ii) target. While present study is specifically geared towards nucleosynthesis experiments,...
We show that Wolf et al.'s 2011 analysis in Class. Quant. Grav. v28, 145017 does not support their conclusions, particular there is "no redshift effect" atom interferometers except inconsistent dual Lagrangian formalisms. al. misapply both Schiff's conjecture and the results of own when they conclude are tests weak equivalence principle which only become if invalid. Atom direct any formalism.
We show that a characteristic two-photon lineshape asymmetry arises in coherent population trapping (CPT) and three-photon (N) resonances, because both resonances are simultaneously induced by modulation sidebands the interrogating laser light. The N resonance is which Raman excitation combined with resonant optical pumping field. This joint CPT can be dominant source of distortion, direct relevance for operation miniaturized atomic frequency standards. present results an experimental study...
We review the physics of atoms and clocks in weakly curved spacetime, how each may be used to test Einstein Equivalence Principle (EEP) context minimal Standard Model Extension (mSME). find that conventional matter-wave interferometers are sensitive same kinds EEP-violating physics. show analogy between matter-waves remains true for systems beyond semiclassical limit. quantitatively compare experimentally observable signals EEP violation experiments. comparisons $^{6}$Li $^{7}$Li...
Alkali vapor cells with antirelaxation coated walls can have long atomic coherence times. However, using such in the hyperfine configuration for electromagnetically induced transparency (EIT) requires longitudinal motion to be confined less than wavelength. We employed a narrow (1 mm) cell geometry study EIT and slow stored light warm R87b vapor, results comparable those buffer gas showing promise of several applications.
We present a preliminary experimental study of the dependence on optical depth slow and stored light pulses in Rb vapor. In particular, we characterize efficiency as function density; pulse duration, delay storage time; control field intensity. Experimental results are good qualitative agreement with theoretical calculations based simplified three-level model at moderate densities.
We present a consistent, generally covariant quantization of light for non-vacuum birefringent, Lorentz-symmetry breaking electrodynamics in the context Standard Model Extension. find that number quanta field is not frame independent, and interaction quantized with matter necessarily birefringent. also show conventional Lorenz gauge condition used to restrict photon-mode basis solutions Maxwell equations must be weakened consistently describe Lorentz symmetry violation.