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Type of state of an atom-electromagnetic field system
In physics, atomic coherence is the induced coherence between levels of a multi-level atomic system and an electromagnetic field. The internal state of
Atomic_coherence
Potential for two waves to interfere
In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Even for wave
Coherence_(physics)
Time of electromagnetic wave coherence
with coherence times up to several 100 μs. Physics portal Atomic coherence Temporal coherence Degree of coherence Precision measurements with atomic hydrogen
Coherence_time
atoms in the heat bath are given a small bit of quantum coherence. The phase of the atomic coherence provides a new control parameter. The deep physics behind
Photo-Carnot_engine
Pakistani academic
quantum coherence, quantum entanglement, quantum information science, and quantum metrology. Zubairy contributed to the theory of squeezed states, atomic coherence
Suhail_Zubairy
Smallest unit of a chemical element
pp. 232–236. ISBN 978-0-7503-0481-8. OCLC 47150433. Watkins, Thayer. "Coherence in Stimulated Emission". San José State University. Archived from the
Atom
Use of light to raise electrons to higher energy states
electromagnetic radiation to effectively pump and unpump these isotopes. Atomic coherence Laser pumping Optical cavity Rabi cycle "Lamp 4462" (gif). sintecoptronics
Optical_pumping
Study of matter-light interactions at small scales
Atomic, molecular, and optical physics (AMO) is the study of matter–matter and light–matter interactions, at the scale of one or a few atoms and energy
Atomic, molecular, and optical physics
Atomic,_molecular,_and_optical_physics
Application of quantum mechanics and chemistry to biology
(Speech). From Atomic to Mesoscale: The Role of Quantum Coherence in Systems of Various Complexities. Institute for Theoretical, Atomic and Molecular and
Quantum_biology
Quantum mechanical phenomenon
electric or magnetic fields during suitably adjusted time intervals. Atomic coherence Bloch sphere Laser pumping Optical pumping Rabi problem Vacuum Rabi
Rabi_cycle
Model of a quantum/optical system
{\displaystyle \langle \sigma _{z}\rangle } , the cavity field, atomic coherence, and atomic inversion respectively, are d d t ⟨ a ⟩ = i ( − Δ c ⟨ a ⟩ − i
Maxwell–Bloch_equations
Device that measures magnetism
based on atomic gasses can perform vector measurements of the magnetic field in the low field regime, where the decay of the atomic coherence becomes faster
Magnetometer
Quasiparticles arising from EM wave coupling
distinctly different from magnon or exciton polaritons Cavity polaritons Atomic coherence Polariton laser Polariton superfluid Polaritonics "Polariton". Lexico
Polariton
Intereference effect in quantum optics
comparison to doppler or sideband cooling (assuming the same cooling rate). Atomic coherence Electromagnetically Induced Grating Liu, Chien; Dutton, Zachary; Behroozi
Electromagnetically induced transparency
Electromagnetically_induced_transparency
maintain coherence. Rather than relying on photons to store phase coherence, it relies on collective effects in an atomic medium to store coherence. Such
Superradiant_laser
Value in matrix theory
In linear algebra, mutual coherence (or simply coherence) measures the maximum similarity between any two columns of a matrix, defined as the largest absolute
Mutual coherence (linear algebra)
Mutual_coherence_(linear_algebra)
Type of system of units of measurement
numerical value equation is 9 J = (1/2) × 2 kg × (3 m/s)2. The concept of coherence was developed in the mid-nineteenth century by, among others, Lord Kelvin
Coherence (units of measurement)
Coherence_(units_of_measurement)
Type of magnetometer
{\displaystyle \delta B} of atomic magnetometers are limited by the number of atoms N {\displaystyle N} and their spin coherence lifetime T 2 {\displaystyle
SERF
Atom laser Atom probe Atomic clock Atomic coherence Atomic fountain Atomic line filter Atomic ratio Atomic spectroscopy Atomic vapor laser isotope separation
List_of_laser_articles
American physicist
E.; Siddiqi, I. (July 2013). "Reduction of the radiative decay of atomic coherence in squeezed vacuum". Nature. 499 (7456): 62–65. arXiv:1301.6276. Bibcode:2013Natur
Irfan_Siddiqi
optical coherence properties of the material. They were first demonstrated with population gratings on atoms. EIGs can be used for purposes of atomic/molecular
Electromagnetically induced grating
Electromagnetically_induced_grating
Estimation of an atom's position
lattices, and atom optics. Atom localization is based on employing atomic coherence to determine the position of the atom to a precision smaller than the
Atom_localization
Device that emits light via optical amplification
also have high temporal coherence, which permits them to emit light with a very narrow frequency spectrum. Temporal coherence can also be used to produce
Laser
Study involving matter and electromagnetic radiation
physical and electronic structure of matter to be investigated at the atomic, molecular and macro scale, and over astronomical distances. Historically
Spectroscopy
Quantum-mechanical version of computer memory
spatial coherence of the storage excitation. Early successes included storing weakly coherent pulses of spatial structure in a warm, ultracold atomic whole
Quantum_memory
Russian-American physicist
in the class of 2020, "for outstanding research of quantum coherence phenomena in atomic vapors, and ongoing service to OSA and the optics community"
Irina_Novikova_(physicist)
Experiment in spectroscopy
The heteronuclear single quantum coherence or heteronuclear single quantum correlation experiment, normally abbreviated as HSQC, is used frequently in
Heteronuclear single quantum coherence spectroscopy
Heteronuclear_single_quantum_coherence_spectroscopy
Interference phenomenon of waves
spectral coherence, as it is related to the presence of different frequency components in the wave. In the case of light emitted by an atomic transition
Diffraction
One quintillionth of a second
electrons. Attosecond pulses have also been used to study and control quantum coherence in molecules. In a 2026 study published in Nature, researchers used synchronized
Attosecond
New Zealand physicist (born 1942)
Ginossar, E; Sidiqi, I (2013). "Reduction of the radiative decay of atomic coherence in squeezed vacuum". Nature. 499 (7456): 62–65. arXiv:1301.6276. Bibcode:2013Natur
Crispin_Gardiner
Rules that guarantee predictable computer memory operation
different from coherence, which occurs in systems that are cached or cache-less, and is consistency of data with respect to all processors. Coherence deals with
Consistency_model
Quantum mechanical waves describing matter
packets of matter waves. Coherence The visibility of diffraction features using an optical theory approach depends on the beam coherence, which at the quantum
Matter_wave
Conformity to reality
that a statement is true if it corresponds to facts. According to the coherence theory, truth consists in logical consistency and mutual support among
Truth
in atomic clocks. Laser cooling and optical manipulation can also extend the coherence time of atomic states, reducing the sensitivity of atomic clocks
Optical_manipulation_of_atoms
Atomic battery Atomic beam Atomic clock Atomic coherence Atomic diffusion Atomic electron configuration table Atomic electron transition Atomic emission spectrum
Index_of_physics_articles_(A)
Measure of interference in a wave system
measure the coherence of two waves (or one wave with itself). A theoretical definition of the coherence is given by the degree of coherence, using the
Interferometric_visibility
Type of atomic clock
subset of atomic clocks and are based on transitions that emit electromagnetic radiation in the range of 200 nm to 1000 nm. Like other atomic clocks, they
Optical_clock
Russian physicist
joined Texas A&M University where he wrote a research paper titled Quantum Coherence and Interference in Optics and Laser Spectroscopy that he used for his
Mikhail_Lukin
Topics referred to by the same term
convolution kernel used in statistics Graph bandwidth, in graph theory Coherence bandwidth, a frequency range over which a channel can be considered "flat"
Bandwidth
Atomic imaging tool
defined as having >10 A/cm2 with spatial coherence of >1 nm. This level of energy with that small amount of coherence is a large technical problem, not only
Ultrabright_electron
Imaging by sections or sectioning using a penetrative wave
higher computing cost. Although MRI (magnetic resonance imaging), optical coherence tomography and ultrasound are transmission methods, they typically do
Tomography
Description of physical properties at the atomic and subatomic scale
however, it is insufficient for describing them at very small submicroscopic (atomic and subatomic) scales. Classical mechanics can be derived from quantum mechanics
Quantum_mechanics
American theoretical physicist (1925–2018)
Prize in Physics "for his contribution to the quantum theory of optical coherence", with the other half shared by John L. Hall and Theodor W. Hänsch. In
Roy_J._Glauber
Mechanism recovering classical behavior from a quantum system
In physics, dephasing or phase damping is a loss of phase coherence between different states of a quantum system. It is a type of decoherence, and can
Dephasing
American television series
Saloni. "Spy drama The Copenhagen Test is heavy on twists and light on coherence". AV Club. Retrieved January 9, 2026. The Copenhagen Test at IMDb
The_Copenhagen_Test
2025 film by Osgood Perkins
it as "tonally haphazard" and criticizing it for a "lack of dramatic coherence". He argued that the film's irony and snark undermine any intended commentary
The_Monkey_(film)
Russian-American physicist
Budker (born 1963) is a Russian-American physicist known for his work in atomic, molecular, and optical physics, as well as precision measurements and fundamental
Dmitry_Budker
German physicist
nomination from the APS Division of Atomic, Molecular & Optical Physics, "for pioneering theoretical work with quantum coherences, such as near-resonant nonlinear
Susanne_Yelin
Cooling technique in atomic physics
sample temperatures approaching absolute zero. It is routinely used in atomic physics experiments where the laser-cooled atoms are manipulated and measured
Laser_cooling
1954 U.S. thermonuclear weapon test in the Marshall Islands
techniques used in the interstage to smooth the spatial profile (i.e. reduce coherence and nonuniformities) of the primary's irradiance are of utmost importance
Castle_Bravo
1997 and 1999 Tōkai nuclear plant events
filed and new safety measures were put into effect. By March 2000, Japan's atomic and nuclear commissions began regular investigations of facilities, expansive
Tokaimura_nuclear_accidents
Measurement method using interference of waves
available at the time had limited coherence length. Michelson pointed out that constraints on geometry forced by limited coherence length required the use of
Interferometry
Russian state-owned nuclear technologies company
State Atomic Energy Corporation Rosatom, commonly known as Rosatom (Russian: Государственная корпорация по атомной энергии «Росатом», romanized: Gosudarstvennaya
Rosatom
Subsystem of the Linux kernel
is what is called Atomic Display (formerly known as atomic mode-setting and atomic or nuclear pageflip). The purpose of the atomic mode-setting is to
Direct_Rendering_Manager
American award for atomic, molecular, and optical physics
The I. I. Rabi Prize in Atomic, Molecular, and Optical Physics is given by the American Physical Society to recognize outstanding work by mid-career researchers
I._I._Rabi_Prize
Sub-field of quantum physics and optics
Quantum optics is a branch of atomic, molecular, and optical physics and quantum chemistry that studies the behavior of photons (individual quanta of light)
Quantum_optics
Thought experiment in quantum mechanics
from the original on October 29, 2020. Collis, Clark (June 20, 2014). "Coherence". Entertainment Weekly. Archived from the original on December 3, 2022
Schrödinger's_cat
Directory-based coherence is a mechanism to handle cache coherence problem in distributed shared memory (DSM) a.k.a. non-uniform memory access (NUMA).
Directory-based_coherence
Specific quantum state of a quantum harmonic oscillator
first order coherence (see degree of coherence). However, for measurements correlating detections at multiple detectors, higher-order coherence is involved
Coherent_state
Spectral linewidth of a laser beam
are spatial coherence and spectral coherence. While spatial coherence is related to the beam divergence of the laser, spectral coherence is evaluated
Laser_linewidth
Superconducting qubit implementation
electrometer such as the radio-frequency single-electron transistor. Typical T2 coherence times for a charge qubit are on the order of 1–2 μs. Recent work has shown
Charge_qubit
Nano-tetherball Sensor Omnidirectional camera Organoleptic sensors Optical coherence tomography Phase unwrapping techniques Polygraph Truth Detection Positron
List_of_sensors
French astrophysicist (1926–2020)
sciences. In 1952, he reunited with Alfred Kastler in research on atomic coherence phenomenon and secured his doctoral degree (Doctor of Science) under
Jacques_Blamont
Means of studying the interaction of light and matter
computing platforms due to its exceptional coherence properties, with recent demonstrations achieving coherence times exceeding 100 μs. Flux qubits, in contrast
Circuit quantum electrodynamics
Circuit_quantum_electrodynamics
2025 film by Danny Boyle
Later a negative review, describing it as "short on wit and narrative coherence." Robert Daniels, writing for RogerEbert.com, gave the film three-and-a-half
28_Years_Later
State of matter
University). However, cooling atomic hydrogen turned out to be technically difficult, and Bose-Einstein condensation of atomic hydrogen was only realized
Bose–Einstein_condensate
Form of particle interferometry
frequencies. Ramsey's method is used today in atomic clocks and in the SI definition of the second. Most precision atomic measurements, such as modern atom interferometers
Ramsey_interferometry
Type of concurrency control mechanism
programming by allowing a group of load and store instructions to execute in an atomic way. It is a concurrency control mechanism analogous to database transactions
Transactional_memory
Objects too small to be seen unaided
Ishizaki, Akihito; Jonas, David M.; Lundeen, Jeff S. (March 2017). "Using coherence to enhance function in chemical and biophysical systems". Nature. 543
Microscopic_scale
Information storage technology
holographic information in the second-order coherence of entangled photon pairs rather than first-order coherence. Through the use of spatial-polarization
Electronic_quantum_holography
Interview". Nuclear Museum. Retrieved 6 November 2025. Compton, Arthur (1956). Atomic Quest. New York: Oxford University Press. OCLC 173307. Hewlett, Richard
List of Nobel laureates who worked on the Manhattan Project
List_of_Nobel_laureates_who_worked_on_the_Manhattan_Project
Common configuration for optical interferometry
it is required that the differential pathlength is reduced below the coherence length of the light source. That can be only micrometers for white light
Michelson_interferometer
Frequency in atomic physics
{\displaystyle \Omega } is the frequency at which the probability amplitudes of two atomic energy levels fluctuate in an oscillating electromagnetic field. It is proportional
Rabi_frequency
Comparison of various scales
within a metric system such as the SI than in others, due to the system's coherence and its metric prefixes that act as power-of-10 multipliers. The definition
Conversion_of_units
Lensless computational imaging method
either added or subtracted from one another. Coherence is important in the context of CDI as the coherence of the two sources allows for the continuous
Coherent_diffraction_imaging
Computer hardware technology that uses quantum mechanics
Governments have invested in research aimed at developing qubits with longer coherence times and lower error rates. Example implementations include superconductors
Quantum_computing
Recording to reproduce a three-dimensional light field
quantitative imaging of ocular structures. When paired with low-coherence interferometry, coherence gating isolates light returning from a selected depth, while
Holography
Point defect in diamonds
optically detected magnetic resonance), and its relatively long spin coherence at room temperature, lasting up to milliseconds. The NV center energy
Nitrogen-vacancy_center
Type of quantum state
to the coherent (unentangled) state. The second factor is how much the coherence (the length of the Bloch vector, | J x | {\displaystyle \left|J_{x}\right|}
Squeezed_coherent_state
Theory of a quantum origin of consciousness
"Pixie dust in the synapses is about as explanatorily powerful as quantum coherence in the microtubules." David Chalmers has argued against quantum consciousness
Orchestrated objective reduction
Orchestrated_objective_reduction
(1925–2018) American "for his contribution to the quantum theory of optical coherence" John L. Hall (b. 1934) "for their contributions to the development of
2005_Nobel_Prizes
Branch of logic
the propositional variables are called atomic formulas of a formal propositional language. While the atomic propositions are typically represented by
Propositional_logic
American physicist
helps connect the world of theoretical and experimental physics. These atomic, molecular, and optical physics (AMO) engineered systems have applications
Monika_Schleier-Smith
8th episode of the 3rd season of Twin Peaks
viewers found the narrative's abstract nature confusing and lacking in coherence. Gotta light? — Woodsman (used as a promotional tagline for the episode)
Part_8_(Twin_Peaks)
US information technology company
several measures, such as accuracy, scalability, predictability, and coherence time. Others criticize the slow operational times and relative size of
IonQ
Australian quantum computing company
qubits have demonstrated favourable performance indicators such as long coherence times and biased noise. SQC was founded by Michelle Simmons in 2017. She
Silicon_Quantum_Computing
American philosopher
justified if it, better than its competitors, increases the explanatory coherence of the person's entire belief set. This is Lycan's explanationist theory
William_Lycan
Range of physical processes in physics
radiation, along with many other factors including polarization, angle, and coherence. For larger diameters, the problem of electromagnetic scattering by spheres
Scattering
Type of gas laser
beams of similar quality in terms of spatial coherence (a single-mode Gaussian beam) and long coherence length (however, since about 1990 semiconductor
Helium–neon_laser
Chemical element with atomic number 32 (Ge)
Germanium is a chemical element; it has the symbol Ge and atomic number 32. It is lustrous, hard-brittle, grayish-white and similar in appearance to silicon
Germanium
Type of microscope with electrons as a source of illumination
electron microscopes, improving the image quality due to the additional coherence and lower chromatic aberrations. The 2000s were marked by advancements
Electron_microscope
2017 supernatural horror film by Andy Muschietti
suspense, 'It' just jumps from scene to scares with no connection or coherence to thread them together other than the mere fact that they've been placed
It_(2017_film)
CPU instruction to set a memory location to a flag value and return its prior value
a flag value to a memory location and return its old value as a single atomic (i.e., non-interruptible) operation. The caller can then "test" the result
Test-and-set
Measuring instrument for surface profile and roughness
sensor), confocal microscopy (used for profiling very small objects), coherence scanning interferometry, and digital holography. Advantages of optical
Profilometer
References External links ab initio A mathematical model which seeks to describe atomic nuclei by solving the non-relativistic Schrödinger equation for all constituent
Glossary_of_physics
American philosopher (1892–1987)
"correspondence" or "coherence"; at any rate, he admitted, the "coherence" between thought and its ideal object differs from the coherence that may obtain
Brand_Blanshard
Interferometer which uses the wave-like nature of atoms
principle can provide arbitrary amounts of measurement time, provided quantum coherence is preserved. The early atom interferometers deployed slits or wires for
Atom_interferometer
Laser science process
field and as a result the harmonics have similar temporal and spatial coherence properties. High harmonics are often generated with pulse durations shorter
High_harmonic_generation
Nonlinear two-terminal fundamental circuit element
the electrical devices showing memristive behavior in atomically thin nanomaterials or atomic sheets. In 2018, Ge and Wu et al. in the Akinwande group
Memristor
CPU instructions which read and modify an unaltered value in memory
that location since the load-link. Together, this implements a lock-free, atomic, read–modify–write operation. "Load-linked" is also known as load-link,
Load-link/store-conditional
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