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5 papers · 2 filters
Quantum state tomography using a single apparatus
B. Mehmani, A. E. Allahverdyan, Th. M. Nieuwenhuizen
The density matrix of a two-level system (spin, atom) is usually determined by measuring the three non-commuting components of the Pauli vector. This density matrix can also be obt…
Spatially resolved observation of dipole-dipole interaction between Rydberg atoms
C. S. E. van Ditzhuijzen, A. F. Koenderink, J. V. Hernández +3
We have observed resonant energy transfer between cold Rydberg atoms in spatially separated cylinders. Resonant dipole-dipole coupling excites the 49s atoms in one cylinder to the…
The Quantum Measurement Process: Lessons from an Exactly Solvable Model
Armen E. Allahverdyan, Roger Balian, Theo M. Nieuwenhuizen
The measurement of a spin-$\half$ is modeled by coupling it to an apparatus, that consists of an Ising magnetic dot coupled to a phonon bath. Features of quantum measurements are d…
Field quantization in inhomogeneous anisotropic dielectrics with spatio-temporal dispersion
L. G. Suttorp
A quantum damped-polariton model is constructed for an inhomogeneous anisotropic linear dielectric with arbitrary dispersion in space and time. The model Hamiltonian is completely…
Simultaneous Measurement of Non-Commuting Observables
G. Aquino, B. Mehmani
It is shown that the full unknown state of a spin-1/2 system, S, which, within Born's statistical interpretation, is meant as the state of an ensamble of identically prepared syste…