0000000000955147

AUTHOR

Antti Putaja

showing 2 related works from this author

Validity of power functionals for a homogeneous electron gas in reduced-density-matrix-functional theory

2016

Physically valid and numerically efficient approximations for the exchange and correlation energy are critical for reduced density-matrix functional theory to become a widely used method in electronic structure calculations. Here we examine the physical limits of power functionals of the form $f(n,n')=(n n')^\alpha$ for the scaling function in the exchange-correlation energy. To this end we obtain numerically the minimizing momentum distributions for the three- and two-dimensional homogeneous electron gas, respectively. In particular, we examine the limiting values for the power $\alpha$ to yield physically sound solutions that satisfy the Lieb-Oxford lower bound for the exchange-correlatio…

PhysicsStrongly Correlated Electrons (cond-mat.str-el)ta114FOS: Physical sciences02 engineering and technologyElectronic structureFunction (mathematics)021001 nanoscience & nanotechnologyKinetic energy01 natural sciencesUpper and lower boundselectron gasMomentumCondensed Matter - Strongly Correlated Electronsreduced-density-matrix-functional theoryQuantum mechanics0103 physical sciences010306 general physics0210 nano-technologyFermi gasScalingEnergy (signal processing)Physical Review A
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Optimal control strategies for coupled quantum dots

2013

AbstractSemiconductor quantum dots are ideal candidates for quantum information applications in solid-state technology. However, advanced theoretical and experimental tools are required to coherently control, for example, the electronic charge in these systems. Here we demonstrate how quantum optimal control theory provides a powerful way to manipulate the electronic structure of coupled quantum dots with an extremely high fidelity. As alternative control fields we apply both laser pulses as well as electric gates, respectively. We focus on double and triple quantum dots containing a single electron or two electrons interacting via Coulomb repulsion. In the two-electron situation we also br…

PhysicsQuantum networkPhysicsQC1-999Quantum sensorquantum dotGeneral Physics and AstronomyQuantum simulator02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencescoherenceQuantum technologyOpen quantum systemQuantum error correctionQuantum mechanics0103 physical sciencesQuantum algorithmQuantum information010306 general physics0210 nano-technologyoptimal control theoryOpen Physics
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