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Longer titles found: Density matrix embedding theory (view), Density matrix renormalization group (view)

searching for Density matrix 79 found (359 total)

CONQUEST (631 words) [view diff] exact match in snippet view article find links to article

density matrix, ρ(r,r′){\displaystyle \rho (\mathbf {r} ,\mathbf {r} ^{\prime })}. To make the problem computationally tractable, the density matrix is

Redfield equation (1,834 words) [view diff] exact match in snippet view article find links to article

Markovian master equation that describes the time evolution of the reduced density matrix ρ of a strongly coupled quantum system that is weakly coupled to an

Steven R. White (506 words) [view diff] case mismatch in snippet view article find links to article

superconductors and quantum spin liquids. He is most known for inventing the Density Matrix Renormalization Group (DMRG) in 1992. This is a numerical variational

Hierarchical equations of motion (1,305 words) [view diff] exact match in snippet view article find links to article

is a non-perturbative approach developed to study the evolution of a density matrix ρ(t){\displaystyle \rho (t)} of quantum dissipative systems. The method

Werner state (1,164 words) [view diff] exact match in snippet view article find links to article

d^{2}} × d2{\displaystyle d^{2}}-dimensional bipartite quantum state density matrix that is invariant under all unitary operators of the form U⊗U{\displaystyle

Quantum Fisher information (3,476 words) [view diff] exact match in snippet view article find links to article

|k⟩{\displaystyle \vert k\rangle } are the eigenvalues and eigenvectors of the density matrix ϱ,{\displaystyle \varrho ,} respectively, and the summation goes over

Mulliken population analysis (791 words) [view diff] exact match in snippet view article find links to article

Cμi for the μ'th basis function in the i'th molecular orbital, the density matrix terms are: Dμν=2∑iCμiCνi∗{\displaystyle \mathbf {D_{\mu \nu }} =\mathbf

Dephasing (823 words) [view diff] exact match in snippet view article find links to article

coherence of a sample is explained by the off-diagonal elements of a density matrix. An external electric or magnetic field can create coherences between

Vibronic coupling (2,630 words) [view diff] exact match in snippet view article find links to article

complete basis set (CBS) limit, knowledge of the reduced transition density matrix between a pair of states (both at the unperturbed geometry) suffices

Conservation law (2,300 words) [view diff] exact match in snippet view article find links to article

vector case A(y) usually corresponding to the Jacobian of a current density matrix J(y): A(y)=Jy(y){\displaystyle \mathbf {A} (\mathbf {y} )=\mathbf {J}

Open quantum system (2,763 words) [view diff] exact match in snippet view article find links to article

equations of motion, also known as master equations, that govern how the density matrix describing the system changes over time and the dynamics of the observables

Bahram Askerov (271 words) [view diff] exact match in snippet view article find links to article

applicable. B.M.Askerov generalized the W.W.Adams and L.J.Goldstein's density matrix method, underlying the quantum theory of transverse thermomagnetic phenomena

Quantum crystallography (1,301 words) [view diff] exact match in snippet view article find links to article

enables mapping the one-electron distribution or the elements of a density matrix. The kind of radiation and scattering determines the quantity which

Quantum stochastic calculus (2,937 words) [view diff] exact match in snippet view article find links to article

space of dimension d, the amount of real numbers required to store the density matrix is of order d2, and the time required to compute the master equation

Multiple exciton generation (997 words) [view diff] exact match in snippet view article find links to article

of the above models can be described by the same mathematical model (density matrix) which can behave differently depending on the set of initial parameters

Werner Israel (1,431 words) [view diff] exact match in snippet view article find links to article

described by a mixed state -- a thermal density matrix. However, it is possible to ``purify'' such a thermal density matrix as a pure state of a doubled system

Many-body localization (3,044 words) [view diff] exact match in snippet view article find links to article

This question can be formalized by considering the quantum mechanical density matrix ρ of the system. If the system is divided into a subregion A (the region

Quil (instruction set architecture) (899 words) [view diff] case mismatch in snippet view article

Classical/Quantum Approach for Large-Scale Studies of Quantum Systems with Density Matrix Embedding Theory". arXiv:1610.06910 [quant-ph]. Farhi, Edward; Goldstone

Møller–Plesset perturbation theory (2,772 words) [view diff] exact match in snippet view article find links to article

non-existent, depending on the precise chemical system or basis set. The density matrix for the first-order and higher MP2 wavefunction is of the type known

Entanglement distillation (4,476 words) [view diff] exact match in snippet view article find links to article

classical entropy for quantum systems. Mathematically, for a given density matrix p{\displaystyle p}, the von Neumann entropy S(p){\displaystyle S(p)}

Nonlinear eigenproblem (1,679 words) [view diff] no match in snippet view article find links to article

eigenvalue problems as well as nonlinear eigenvalue problems, designed from density-matrix representation in quantum mechanics combined with contour integration

Projective Hilbert space (791 words) [view diff] exact match in snippet view article find links to article

pure states. Convex linear combinations of rays naturally give rise to density matrix which (still in case of an irreducible representation) correspond to

Phase space (2,127 words) [view diff] exact match in snippet view article find links to article

are obtained isomorphically to tracing operator observables with the density matrix in Hilbert space: they are obtained by phase-space integrals of observables

Triatomic hydrogen (2,115 words) [view diff] exact match in snippet view article find links to article

David A. (5 October 2015). "Structure of the one-electron reduced density matrix from the generalized Pauli exclusion principle". International Journal

Concurrence (quantum computing) (627 words) [view diff] exact match in snippet view article

{M}}^{2})}}} in which ρM{\displaystyle \rho _{\mathcal {M}}} is the reduced density matrix (or its continuous-variable analogue) across the bipartition M{\displaystyle

Quantum refereed game (3,110 words) [view diff] exact match in snippet view article find links to article

only one turn per game. The game works by having each player send a density matrix to the referee who then plugs those states into his quantum circuit

Wigner's friend (4,514 words) [view diff] exact match in snippet view article find links to article

expresses this as follows: "There is a paradox only if we suppose that a density matrix (i.e. a probability distribution) is something 'physically real' and

Quasiprobability distribution (3,142 words) [view diff] exact match in snippet view article find links to article

P is often a distribution. Q is always broader than P for the same density matrix. For example, for a thermal state, ρ^=1n¯+1∑n=0∞(n¯1+n¯)n|n⟩⟨n| ,{\displaystyle

Frequency domain decomposition (284 words) [view diff] exact match in snippet view article find links to article

frequency response given (multi-)output data. Estimate the power spectral density matrix G^yy(jω){\displaystyle {\hat {G}}_{yy}(j\omega )} at discrete frequencies

Reduction criterion (647 words) [view diff] exact match in snippet view article find links to article

H_{2}.} An (un-normalized) mixed state ρ is a positive linear operator (density matrix) acting on H. A linear map Φ: L(H2) → L(H1) is said to be positive if

Schrödinger Medal (109 words) [view diff] exact match in snippet view article find links to article

and his fundamental contributions to density functional theory and density matrix theory" 22 2011 Peter Gill "For his outstanding contributions to intracules

Range criterion (536 words) [view diff] exact match in snippet view article find links to article

\;\{v_{i}\}}. The range criterion is a special case of this fact. A density matrix ρ acting on H is separable if and only if it can be written as ρ=∑iψ1

Aditi Sen De (1,025 words) [view diff] no match in snippet view article find links to article

particular the formulation of a computable entanglement measure and a novel density-matrix recursion method. Her work also involves understanding the theory of

Distributed multipole analysis (933 words) [view diff] exact match in snippet view article find links to article

takes the form of a sum of products of the basis functions, called density matrix elements. Boys (1950) showed that the product of two spherical Gaussian

Ability (magazine) (1,136 words) [view diff] exact match in snippet view article

in both content and form and is the first to embed VOICEYE (a high-density matrix barcode system) on its editorial pages to hear print through smartphones

N-electron valence state perturbation theory (2,992 words) [view diff] exact match in snippet view article find links to article

Strongly Contracted development. To evaluate these norms, the spinless density matrix of rank not higher than three between the Ψm(0){\displaystyle \Psi _{m}^{(0)}}

LOCC (2,795 words) [view diff] exact match in snippet view article find links to article

statistics are exactly the same (both states have the same reduced density matrix). E.g., assume that Alice measures the first qubit, and obtains the

Simone Severini (370 words) [view diff] case mismatch in snippet view article find links to article

Sibasish; Severini, Simone (2006). "The Laplacian of a Graph as a Density Matrix: A Basic Combinatorial Approach to Separability of Mixed States". Annals

Two-dimensional nuclear magnetic resonance spectroscopy (2,783 words) [view diff] case mismatch in snippet view article find links to article

Inc. p. 59. Mateescu, Gheorghe D.; Valeriu, Adrian (1993). 2D NMR Density Matrix and Product Operator Treatment. Englewood Cliffs, New Jersey: PTR Prentice

Quantum dissipation (1,777 words) [view diff] exact match in snippet view article find links to article

not describe dephasing unless a subsystem is chosen and the reduced density matrix of this open quantum system is analyzed. Dephasing leads to quantum

Quantum Heisenberg model (2,518 words) [view diff] exact match in snippet view article find links to article

provides an important and tractable theoretical example for applying density matrix renormalisation. The six-vertex model can be solved using the algebraic

George M. Whitesides (3,155 words) [view diff] exact match in snippet view article find links to article

studied spin-spin coupling in a variety of organic compounds, using density matrix calculations to examine the spin systems that NMR analyses detect. Whitesides

Quantum programming (4,030 words) [view diff] case mismatch in snippet view article find links to article

Classical/Quantum Approach for Large-Scale Studies of Quantum Systems with Density Matrix Embedding Theory". arXiv:1610.06910 [quant-ph]. Farhi, Edward; Goldstone

Rényi entropy (3,180 words) [view diff] exact match in snippet view article find links to article

considered to be an observable, due to its nonlinear dependence on the density matrix. (This nonlinear dependence applies even in the special case of the

Sandu Popescu (1,577 words) [view diff] exact match in snippet view article find links to article

pure bi-partite quantum states (the von Neumann entropy of the reduced density matrix). With Daniel Rohrlich, Popescu showed that nonlocal correlations stronger

Vitamin K (7,755 words) [view diff] no match in snippet view article find links to article

shown to lower this ratio and improve lumbar vertebrae bone mineral density. Matrix Gla protein must undergo vitamin K dependent phosphorylation and carboxylation

Sourav Pal (1,776 words) [view diff] exact match in snippet view article find links to article

derivative of the KS matrix is obtained using the finite field, and then the density matrix derivative is obtained by a single-step CPKS solution followed by the

Evert Jan Baerends (302 words) [view diff] exact match in snippet view article find links to article

and his fundamental contributions to density functional theory and density matrix theory." Baerends is a member of the International Academy of Quantum

Product operator formalism (4,936 words) [view diff] exact match in snippet view article find links to article

results in NMR spectroscopy and is a simplification of the complete density matrix formalism. In this model, for a single spin, four base operators exist:

Entanglement of formation (758 words) [view diff] exact match in snippet view article find links to article

S(ρA)=S(ρB){\displaystyle S(\rho _{A})=S(\rho _{B})} of the reduced density matrix can be used to measure the entanglement of the state |ψ⟩AB{\displaystyle

Electric dipole moment (7,592 words) [view diff] exact match in snippet view article find links to article

theory, either as a response to constant electric fields or from the density matrix. Such values however are not directly comparable to experiment due to

John David Jackson (physicist) (1,981 words) [view diff] exact match in snippet view article

in high-energy hadronic collisions. They introduced the use of the density matrix to connect production mechanisms to the decay patterns and described

Supernova neutrinos (4,351 words) [view diff] exact match in snippet view article find links to article

flavor evolution of neutrinos for each energy mode is described by the density matrix: ρ^t(E,R)=∑α=e,μ,τLναe−tτ⟨Eνα⟩fνα(E)|να⟩⟨να|{\displaystyle {\hat {\rho

Kurt Gottfried (1,927 words) [view diff] exact match in snippet view article find links to article

in high-energy hadronic collisions. They introduced the use of the density matrix to connect production mechanisms to the decay patterns and described

Wick's theorem (3,443 words) [view diff] exact match in snippet view article find links to article

theory a different type of expectation value, a thermal trace over the density matrix, requires a different definition of normal ordering. Isserlis' theorem

Paul Painlevé (2,573 words) [view diff] exact match in snippet view article find links to article

Jimbo, Michio; Tetsuji Miwa; Yasuko Môri; Mikio Sato (April 1980). "Density matrix of an impenetrable Bose gas and the fifth Painlevé transcendent". Physica

Mike Williams (physicist) (709 words) [view diff] exact match in snippet view article

London Thesis Measurement of the differential cross section and spin density matrix elements along with a partial wave analysis for gamma p to omega p using

Bayesian operational modal analysis (1,100 words) [view diff] exact match in snippet view article find links to article

OMA in the time domain and in the frequency domain using the spectral density matrix and fast Fourier transform (FFT) of ambient vibration data. Based on

AKLT model (1,796 words) [view diff] no match in snippet view article find links to article

1103/physrevb.84.235141. S2CID 55330505. Schollwöck, Ulrich (2011). "The density-matrix renormalization group in the age of matrix product states". Annals of

Victor Savrin (707 words) [view diff] exact match in snippet view article find links to article

hadronic interactions, and in 1978 he defended his D.Sc. thesis, titled A density matrix method in the theory of inclusive reactions. From 1983 Victor Savrin

Bispinor (3,416 words) [view diff] exact match in snippet view article find links to article

Rembieliński, Jakub (5 July 2005). "Lorentz-covariant reduced spin density matrix and Einstein-Podolsky-Rosen–Bohm correlations". Physical Review A. 72

Spin contamination (2,083 words) [view diff] exact match in snippet view article find links to article

approach involves the annihilation of first spin contaminant of the density matrix at each step in the self-consistent solution of the Hartree–Fock equations

Isomonodromic deformation (2,799 words) [view diff] exact match in snippet view article find links to article

Jimbo, Michio; Miwa, Tetsuji; Môri, Yasuko; Sato, Mikio (April 1980). "Density matrix of an impenetrable Bose gas and the fifth Painlevé transcendent". Physica

Kameshwar C. Wali (2,834 words) [view diff] case mismatch in snippet view article find links to article

Pierre; Wali, Kameshwar C. (1 February 1973). "Properties of Polarization Density Matrix in Regge-Pole Models". Physical Review D. 7 (3): 815–835. Bibcode:1973PhRvD

Neepa Maitra (798 words) [view diff] no match in snippet view article find links to article

263401. PMID 29328727.< Lacombe, Lionel; Maitra, Neepa T. (2019-03-12). "Density-Matrix Coupled Time-Dependent Exchange-Correlation Functional Approximations"

Lieb–Oxford inequality (1,780 words) [view diff] exact match in snippet view article find links to article

\sigma _{N})|^{2}.} Alternatively, if the system is described by a density matrix γ, then P is the diagonal γ(x1,...,xN;x1,...,xN).{\displaystyle \gamma

Giacomo Mauro D'Ariano (1,578 words) [view diff] exact match in snippet view article find links to article

G. M.; MacChiavello, C.; Paris, M. G. A. (1994). "Detection of the density matrix through optical homodyne tomography without filtered back projection"

Lane P. Hughston (3,963 words) [view diff] case mismatch in snippet view article find links to article

(1993) A Complete Classification of Quantum Ensembles having a Given Density Matrix, Physics Letters A, Vol 183, pp 14–18. B. Flesaker & L. P. Hughston

Resonance fluorescence (5,338 words) [view diff] exact match in snippet view article find links to article

Since this correlation function includes the steady state limits of the density matrix, where ρ++s.s⇒12{\displaystyle \rho _{++}^{s.s}\Rightarrow {\frac {1}{2}}}

Nabil M. Lawandy (1,624 words) [view diff] exact match in snippet view article find links to article

doi:10.1103/PhysRevA.25.433. Ryan, J.; Lawandy, N. (November 1986). "Density matrix solutions for the susceptibilities of a three-level system with arbitrary

Squeezed states of light (6,034 words) [view diff] exact match in snippet view article find links to article

sufficient for a full characterization of a squeezed state and the full density matrix in the basis of the number states has to be determined.) Spin squeezed

Germán Sierra (5,112 words) [view diff] exact match in snippet view article find links to article

(1998). Equivalence of the variational matrix product method and the density matrix renormalization group applied to spin chains. Europhysics letters, 43(4)

Multipolar exchange interaction (3,412 words) [view diff] exact match in snippet view article find links to article

complete super basis. Therefore, for a J=1{\displaystyle J=1} system, its density matrix must have quadrupole components. This is the reason why a J>1/2{\displaystyle

Diósi–Penrose model (2,954 words) [view diff] exact match in snippet view article find links to article

exactly, and one gets where As expected, for the diagonal terms of the density matrix, when a→=b→{\displaystyle {\vec {\boldsymbol {a}}}={\vec {\boldsymbol

Principal interacting orbital (1,195 words) [view diff] exact match in snippet view article find links to article

structure. Run NBO analysis to obtain the NAO basis and corresponding density matrix. Run PIO analysis. The PIO analysis is based on the statistical method

Helmut Ritsch (962 words) [view diff] exact match in snippet view article find links to article

a computational tool used in dissipative systems to approximate the density matrix of a quantum system. The method was developed in 1992 independently

Dicke model (4,296 words) [view diff] exact match in snippet view article find links to article

master equation in Lindblad form Here, ρ{\displaystyle \rho } is the density matrix of the system, Lα{\displaystyle L_{\alpha }} is the Lindblad operator

Continuous spontaneous localization model (4,563 words) [view diff] exact match in snippet view article find links to article

basis, it becomes clear that its direct action is to diagonalize the density matrix in position. For a single point-like particle of mass m{\displaystyle

Coherent effects in semiconductor optics (4,621 words) [view diff] exact match in snippet view article find links to article

Axt, V. M.; Stahl, A. (1994). "The role of the biexciton in a dynamic density matrix theory of the semiconductor band edge". Zeitschrift für Physik B Condensed