Alexander O. Sushkov
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View article: Noctilucent Clouds Modulated by Strong 5-day Planetary Wave in 2025: Amplitudes, Phases and Altitudes Based on Ground-Based Observations and Satellite Temperature Data
Noctilucent Clouds Modulated by Strong 5-day Planetary Wave in 2025: Amplitudes, Phases and Altitudes Based on Ground-Based Observations and Satellite Temperature Data Open
During the summer season of 2025, noctilucent clouds (NLC) were observed at the latitudes 55-60N from the late May until the late August. A distinct 5-day periodicity in their occurrence emerged following the summer solstice. Analysis of E…
View article: Searching for dark matter with a spin-based interferometer
Searching for dark matter with a spin-based interferometer Open
View article: Search for Axionlike Dark Matter Using Liquid-State Nuclear Magnetic Resonance
Search for Axionlike Dark Matter Using Liquid-State Nuclear Magnetic Resonance Open
We search for dark matter in the form of axionlike particles (ALPs) in the mass range $5.576741 \,\mathrm{neV/c^2}$ - $5.577733\,\mathrm{neV/c^2}$ by probing their possible coupling to fermion spins through the ALP field gradient. This is …
View article: Spin squeezing of macroscopic nuclear spin ensembles
Spin squeezing of macroscopic nuclear spin ensembles Open
Spin squeezing has been explored in atomic systems as a tool for quantum sensing, improving experimental sensitivity beyond the spin standard quantum limit for certain measurements. To optimize absolute metrological sensitivity, it is bene…
View article: Spin Squeezing of Macroscopic Nuclear Spin Ensembles
Spin Squeezing of Macroscopic Nuclear Spin Ensembles Open
Spin squeezing has been explored in atomic systems as a tool for quantum sensing, improving experimental sensitivity beyond the spin standard quantum limit for certain measurements. To optimize absolute metrological sensitivity, it is bene…
View article: Ultralight dark matter detection with levitated ferromagnets
Ultralight dark matter detection with levitated ferromagnets Open
Levitated ferromagnets act as ultraprecise magnetometers, which can exhibit high quality factors due to their excellent isolation from the environment. These instruments can be utilized in searches for ultralight dark matter candidates, su…
View article: Five-years Altitude Statistics of Noctilucent Clouds Based on Multi-Site Wide-Field Camera Survey
Five-years Altitude Statistics of Noctilucent Clouds Based on Multi-Site Wide-Field Camera Survey Open
The results of simultaneous measurements of noctilucent clouds (NLC) position in a number of ground-based locations are presented. Observational data of 14 bright NLC events over 5 years is used for building the altitude maps of cloud fiel…
View article: An Improved Bound on Nonlinear Quantum Mechanics using a Cryogenic Radio Frequency Experiment
An Improved Bound on Nonlinear Quantum Mechanics using a Cryogenic Radio Frequency Experiment Open
There are strong arguments that quantum mechanics may be nonlinear in its dynamics. A discovery of nonlinearity would hint at a novel understanding of the interplay between gravity and quantum field theory, for example. As such, experiment…
View article: Searching for dark matter with a 1000 km baseline interferometer
Searching for dark matter with a 1000 km baseline interferometer Open
Axion-like particles (ALPs) arise from well-motivated extensions to the Standard Model and could account for dark matter. ALP dark matter would manifest as a field oscillating at an (as of yet) unknown frequency. The frequency depends line…
View article: Measurement of the Casimir force between Germanium plates using a torsion balance
Measurement of the Casimir force between Germanium plates using a torsion balance Open
We report the measurement of the Casimir force between Ge plates in a sphere-plane configuration using a torsion balance. We observe that the effective contact potential between the plates varies with their separation distance, resulting i…
View article: Five-Years Altitude Statistics of Noctilucent Clouds Based on Multi-Site Wide-Field Camera Survey
Five-Years Altitude Statistics of Noctilucent Clouds Based on Multi-Site Wide-Field Camera Survey Open
View article: Pulse-Operated First-Generation Biosensors with Extended Linear Range for Continuous Glycemia Monitoring in Oxygen Deficient Environments
Pulse-Operated First-Generation Biosensors with Extended Linear Range for Continuous Glycemia Monitoring in Oxygen Deficient Environments Open
View article: Pulse-Operated First-Generation Biosensors with Extended Linear Range for Continuous Glycemia Monitoring in Oxygen Deficient Environments
Pulse-Operated First-Generation Biosensors with Extended Linear Range for Continuous Glycemia Monitoring in Oxygen Deficient Environments Open
View article: Understanding the dynamics of randomly positioned dipolar spin ensembles
Understanding the dynamics of randomly positioned dipolar spin ensembles Open
Dipolar spin ensembles with random spin positions are attracting much attention because they help us to understand decoherence as it occurs in solid-state quantum bits in contact with spin baths. Also, these ensembles are systems which may…
View article: Calibration of the Solid‐State Nuclear Magnetic Resonance Search for Axion‐Like Dark Matter
Calibration of the Solid‐State Nuclear Magnetic Resonance Search for Axion‐Like Dark Matter Open
Calibration of nuclear‐magnetic‐resonance‐based searches for axion‐like dark matter can be performed by free induction decay (FID) measurements. This manu‐ script describes FID experiments on several solid materials, motivated by the Cosmi…
View article: Frequency‐Scanning Considerations in Axionlike Dark Matter Spin‐Precession Experiments
Frequency‐Scanning Considerations in Axionlike Dark Matter Spin‐Precession Experiments Open
Galactic dark matter may consist of axionlike particles (ALPs) that can be described as an “ultralight bosonic field” oscillating at the ALP Compton frequency. The ALP field can be searched for using nuclear magnetic resonance (NMR), where…
View article: Quantum Sensors for High Energy Physics
Quantum Sensors for High Energy Physics Open
Strong motivation for investing in quantum sensing arises from the need to investigate phenomena that are very weakly coupled to the matter and fields well described by the Standard Model. These can be related to the problems of dark matte…
View article: Frequency-scanning considerations in axionlike dark matter spin-precession experiments
Frequency-scanning considerations in axionlike dark matter spin-precession experiments Open
Galactic dark matter may consist of axionlike particles (ALPs) that can be described as an "ultralight bosonic field" oscillating at the ALP Compton frequency. The ALP field can be searched for using nuclear magnetic resonance (NMR), where…
View article: Understanding the dynamics of randomly positioned dipolar spin ensembles
Understanding the dynamics of randomly positioned dipolar spin ensembles Open
Dipolar spin ensembles with random spin positions attract much attention currently because they help to understand decoherence as it occurs in solid state quantum bits in contact with spin baths. Also, these ensembles are systems which may…
View article: Intensity interferometry for ultralight bosonic dark matter detection
Intensity interferometry for ultralight bosonic dark matter detection Open
Ultralight bosonic dark matter (UBDM) can be described by a classical wavelike field oscillating near the Compton frequency of the bosons. If a measurement scheme for the direct detection of UBDM interactions is sensitive to a signature qu…
View article: Effective electric field: Quantifying the sensitivity of searches for new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="script">P</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="script">T</mml:mi></mml:mrow></mml:math>-odd physics with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>EuCl</mml:mtext><mml:mn>3</mml:mn></mml:msub><mml:mo>·</mml:mo><mml:mn>6</mml:mn><mml:msub><mml:mtext>H</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mtext>O</mml:mtext></mml:mrow></mml:math>
Effective electric field: Quantifying the sensitivity of searches for new -odd physics with Open
Laboratory-scale precision experiments are a promising approach to searching for physics beyond the standard model. Non-centrosymmetric solids offer favorable statistical sensitivity for efforts that search for new fields, whose interactio…
View article: Quantum Science and the Search for Axion Dark Matter
Quantum Science and the Search for Axion Dark Matter Open
The dark-matter puzzle is one of the most important open problems in modern physics. The ultralight\naxion is a well-motivated dark-matter candidate, conceived to resolve the strong-CP problem of quantum\nchromodynamics. Numerous precision…
View article: Scalar dark matter induced oscillation of a permanent-magnet field
Scalar dark matter induced oscillation of a permanent-magnet field Open
Scalar-field dark matter models imply small oscillations of fundamental constants. These oscillations could result in observable variations of the magnetic field in a permanent magnet. We propose an experiment for detection of this type of…
View article: Quantum Science and the Search for Axion Dark Matter
Quantum Science and the Search for Axion Dark Matter Open
The dark matter puzzle is one of the most important open problems in modern physics. The ultra-light axion is a well-motivated dark matter candidate, conceived to resolve the strong-CP problem of quantum chromodynamics. Numerous precision …
View article: EuCl$_3\cdot 6$H$_2$O as the solid-state platform for searches for new P,T-odd physics
EuCl$_3\cdot 6$H$_2$O as the solid-state platform for searches for new P,T-odd physics Open
Condensed matter systems offer the opportunity to maximize the number of spins, probed in magnetic resonance experiments that search for physics beyond the standard model. EuCl$_3\cdot 6$H$_2$O is a promising solid-state platform for such …
View article: Effective electric field: quantifying the sensitivity of searches for new P,T-odd physics with EuCl$_3\cdot$6H$_2$O
Effective electric field: quantifying the sensitivity of searches for new P,T-odd physics with EuCl$_3\cdot$6H$_2$O Open
Laboratory-scale precision experiments are a promising approach to searching for physics beyond the standard model. Non-centrosymmetric solids offer favorable statistical sensitivity for efforts that search for new fields, whose interactio…
View article: Experimental Limit on Nonlinear State-Dependent Terms in Quantum Theory
Experimental Limit on Nonlinear State-Dependent Terms in Quantum Theory Open
Linear time evolution is one of the fundamental postulates of quantum theory. Past theoretical attempts to introduce nonlinearity into quantum evolution have violated causality. However, a recent theory has introduced nonlinear state-depen…
View article: Directional detection of dark matter using solid-state quantum sensing
Directional detection of dark matter using solid-state quantum sensing Open
Next-generation dark matter (DM) detectors searching for weakly interacting massive particles (WIMPs) will be sensitive to coherent scattering from solar neutrinos, demanding an efficient background-signal discrimination tool. Directional …
View article: Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor
Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor Open
Understanding the thermalization dynamics of quantum many-body systems at the microscopic level is among the central challenges of modern statistical physics. Here we experimentally investigate individual spin dynamics in a two-dimensional…
View article: Experimental limit on non-linear state-dependent terms in quantum theory
Experimental limit on non-linear state-dependent terms in quantum theory Open
We report the results of an experiment that searches for causal non-linear state-dependent terms in quantum field theory. Our approach correlates a binary macroscopic classical voltage with the outcome of a projective measurement of a quan…