I. K. Kominis
A5090526827- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Photoreceptor and optogenetics research
- Photosynthetic Processes and Mechanisms
- Quantum optics and atomic interactions
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Advanced MRI Techniques and Applications
- Photochemistry and Electron Transfer Studies
- Electromagnetic Fields and Biological Effects
- Advanced Chemical Physics Studies
- Ocular and Laser Science Research
- Functional Brain Connectivity Studies
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Information and Cryptography
- Quantum Chromodynamics and Particle Interactions
- Electron Spin Resonance Studies
- Particle physics theoretical and experimental studies
- Advanced Fiber Laser Technologies
- Neural dynamics and brain function
- Quantum and electron transport phenomena
- Particle Detector Development and Performance
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
University of Crete
2015-2025
National Technical University of Athens
2013
Foundation for Research and Technology Hellas
2006-2010
Princeton University
2000-2008
University of New Hampshire
2004
Lawrence Berkeley National Laboratory
2004
Massachusetts Institute of Technology
2001
We have measured the parity-violating electroweak asymmetry in elastic scattering of polarized electrons from protons. Significant contributions to this could arise strange form factors nucleon. The is $A=\ensuremath{-}15.05\ifmmode\pm\else\textpm\fi{}0.98(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.56(\mathrm{syst})\phantom{\rule{0.3em}{0ex}}\mathrm{ppm}$ at kinematic point $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩=12.3\ifmmode^\circ\else\textdegree\fi{}$ and...
A large number of magnetic sensors, like superconducting quantum interference devices, optical pumping, and nitrogen vacancy magnetometers, were shown to satisfy the energy resolution limit. This limit states that sensitivity sensor, when translated into a product with time, is bounded below by Planck's constant, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>ℏ</a:mi></a:math>. bound implies fundamental limitation as what can be achieved in sensing. Here we explore biological...
We have measured the transverse asymmetry ${A}_{{T}^{\ensuremath{'}}}$ in ${}^{3}\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}})$ quasielastic scattering Hall A at Jefferson Laboratory with high precision for ${Q}^{2}$ values from 0.1 to $0.6(\mathrm{GeV}/c{)}^{2}$. The neutron magnetic form factor ${G}_{M}^{n}$ was extracted based on Faddeev calculations ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.1$ and...
Chemical reactions involving radical-ion pairs are ubiquitous in biology, since not only they at the basis of photosynthetic reaction chain, but also assumed to underlie biochemical magnetic compass used by avian species for navigation. Recent experiments with magnetic-sensitive radical-ion-pair provided strong evidence magnetoreception mechanism, verifying expected sensitivities and chemical product yield changes. It is here shown that theoretical description 70s cannot explain observed...
Abstract High-order harmonics in the extreme-ultraviolet spectral range, resulting from strong-field laser-atom interaction, have been used a broad range of fascinating applications all states matter. In majority these studies harmonic generation process is described using semi-classical theories which treat electromagnetic field driving laser pulse classically without taking into account its quantum nature. addition, for measurement generated harmonics, experiments require diagnostics...
A high precision measurement of the transverse spin-dependent asymmetry ${A}_{{T}^{\ensuremath{'}}}$ in ${}^{3}\mathrm{He}\ensuremath{\rightarrow}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}})$ quasielastic scattering was performed Hall at Jefferson Lab values squared four-momentum transfer, ${Q}^{2},$ between 0.1 and 0.6 $(\mathrm{G}\mathrm{e}\mathrm{V}/{c)}^{2}.$ is sensitive to neutron magnetic form factor, ${G}_{M}^{n}.$ Values ${G}_{M}^{n}$ ${Q}^{2}=0.1$...
We present data on the inclusive scattering of polarized electrons from a 3He target at energies 0.862 to 5.06 GeV, obtained angle 15.5°. Our include measurements quasielastic peak, through nucleon resonance region, and beyond, were used determine virtual photon cross-section difference σ1/2−σ3/2. extract extended Gerasimov-Drell-Hearn integral for neutron in range four-momentum transfer squared Q2 0.1–0.9 GeV2.Received 15 May 2002DOI:https://doi.org/10.1103/PhysRevLett.89.242301©2002...
We have measured the spin structure functions $g_1$ and $g_2$ of $^3$He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.07 GeV off target 15.5$^{\circ}$ angle. Excitation covered resonance onset deep inelastic regions. determined for first time $Q^2$ evolution $\Gamma_1(Q^2)=\int_0^{1} g_1(x,Q^2) dx$, $\Gamma_2(Q^2)=\int_0^1 g_2(x,Q^2) dx$ $d_2 (Q^2) = \int_0^1 x^2[ 2g_1(x,Q^2) + 3g_2(x,Q^2)] neutron range 0.1 GeV$^2$ $\leq Q^2...
We have measured the transverse asymmetry AT' in quasielastic 3He→(e→,e') process with high precision at Q2 values from 0.1 to 0.6(GeV/c)2. The neutron magnetic form factor GMn was extracted of and 0.2(GeV/c)2 using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) meson-exchange currents (MEC). Theoretical uncertainties due FSI MEC effects were constrained measurement spin-dependent threshold region 3He→(e→,e'). also 0.3 0.6(GeV/c)2 based on plane wave...
Spin noise sets fundamental limits to the attainable precision of measurements using spin-polarized atomic vapors and therefore merits a careful study. On other hand, it has been recently shown that spin contains useful physical information about system, otherwise accessible via magnetic-resonance-type experiments. We here show in yet another manifestation fluctuation-dissipation theorem, reveals on spin-coherence dissipation properties described by $1∕{T}_{2}$, transverse spin-relaxation...
The radical-pair mechanism (RPM) was introduced in the 1960s to explain anomalously large EPR and NMR signals chemical reactions of organic molecules. It has evolved cornerstone spin chemistry, study effect electron nuclear spins have on reactions, with avian magnetic compass photosynthetic reaction center dynamics being prominent biophysical manifestations such effects. In recent years RPM shown be an ideal biological system where conceptual tools quantum-information science can fruitfully...
We present a first-principles analysis of the noise spectra alkali-metal-metal vapors in and out spin-exchange-relaxation-free (SERF) regime, we predict non-intuitive features with potential to further improve sensitivity SERF media, which must be taken into account their use quantum optical applications. Studying process spin-noise spectroscopy (SNS), derive analytic formulas for observable spectra, correlation functions among different hyperfine components, give additional insight spin...
The generalized forward spin polarizabilities γ0 and δLT of the neutron have been extracted for first time in a Q2 range from 0.1 to 0.9 GeV2. Since is sensitive nucleon resonances insensitive Δ resonance, it expected that pair should provide benchmark tests current understanding chiral dynamics QCD. new results on show significant disagreement with perturbation theory calculations, while data at low are good agreement next-to-leading-order relativistic baryon calculation. phenomenological...
We report an experimental and theoretical study of spin-noise correlations in a $^{87}\mathrm{Rb}\text{\ensuremath{-}}^{133}\mathrm{Cs}$ unpolarized alkali-metal vapor dominated by spin-exchange collisions. observe strong unequal-time interspecies account for these with first-principles model. Since the two atomic species have different spin precession frequencies, dual-species enables use additional handle, applied magnetic field, untangling various subtypes correlations. In particular,...
Spin noise sets fundamental limits to the precision of measurements using spin-polarized atomic vapors, such as performed with sensitive magnetometers. squeezing offers possibility extend measurement beyond standard quantum limit uncorrelated atoms. Contrary current understanding, we show that, even in presence spin relaxation, can lead a significant reduction noise, and hence an increase magnetometric sensitivity, for long time. This is case when correlated relaxation due binary alkali-atom...
Radical-ion-pair reactions were recently shown to represent a rich biophysical laboratory for the application of quantum measurement theory methods and concepts. Here we show that radical-ion-pair essentially form nonlinear biochemical double-slit interferometer. Quantum coherence effects are visible when ``which-path'' information is limited, incoherent limit approached measurement-induced decoherence sets in. Based on this analogy with optical experiment derive elaborate fundamental master...
The physics of spin exchange collisions have fueled several discoveries in fundamental and numerous applications medical imaging nuclear magnetic resonance. We here report on the experimental observation theoretical justification spin-noise exchange, transfer from one atomic species to another. signature is an increase total power at low fields, order 1 mG, where two-species resonances overlap. underlying physical mechanism correlation induced by spin-exchange collisions.
We analytically describe the strong-field light-electron interaction using a quantized coherent laser state with arbitrary photon number. obtain wave function which is closed-form solution of time-dependent Schrödinger equation (TDSE). This provides information about quantum optical features not accessible by semi-classical theories. With this approach we can reveal properties high harmonic generation (HHG) process in gases measuring statistics transmitted infrared (IR) radiation. work lead...
We suggest alternative quantum Otto engines, using heat bath algorithmic cooling with partner pairing algorithm instead of isochoric cooling. Liquid state nuclear magnetic resonance systems in one entropy sink are considered as working fluids. Then, the extractable work and thermal efficiency analyzed detail for four-stroke two-stroke type engines. The role these cycles is to use a single two. Also, this increases power engines reducing time required cycle.
Atomic magnetometers have achieved magnetic sensitivities in the subfemtotesla regime. Their bandwidth is determined by transverse spin relaxation rate, 1/T2, which also determines sensitivity. It theoretically demonstrated that using an electromagnetically induced transparent probe beam a pump-probe atomic magnetometer, it possible to operate latter at frequencies much higher than its bandwidth, maintaining high signal-to-noise ratio.
We present an implementation of a robust quantum random number generator based on the fluctuations collective spin alkali-metal vapor. The achieved bit rate is limited by relaxation atoms $1/{T}_{2}$ to about 1 kbit/s. However, same physical scheme, which impervious limitations posed single-photon detectors used in current implementations and rests solely threshold detection, can be extended solid state systems with higher than Gbit/s.