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18 papers · 2 filters
Wigner functions and spin tomograms for qubit states
Peter Adam, Vladimir A. Andreev, Iulia Ghiu +3
We establish the relation of the spin tomogram to the Wigner function on a discrete phase space of qubits. We use the quantizers and dequantizers of the spin tomographic star-produ…
Newton force from wave function collapse: speculation and test
Lajos Diósi
The Diosi-Penrose model of quantum-classical boundary postulates gravity-related spontaneous wave function collapse of massive degrees of freedom. The decoherence effects of the co…
A comparison of the new exact solutions of the relativistic wave equations of a charged particle propagating in a strong laser field in an underdense plasma
Sandor Varro
The relativistic wave equations of a charged particle propagating in a classical monochromatic electromagnetic plane wave, in a medium of index of refraction n_m < 1, have been stu…
Elimination of the A-square problem from cavity QED
András Vukics, Tobias Grießer, Peter Domokos
We generalize the Power-Zineau-Woolley transformation to obtain a canonical Hamiltonian of cavity quantum electrodynamics for arbitrary geometry of boundaries. This Hamiltonian is…
Spin squeezing and entanglement for arbitrary spin
Giuseppe Vitagliano, Iagoba Apellaniz, Inigo L. Egusquiza +1
A complete set of generalized spin-squeezing inequalities is derived for an ensemble of particles with an arbitrary spin. Our conditions are formulated with the first and second mo…
Adiabatic passage in photon-echo quantum memories
Gabor Demeter
Photon-echo based quantum memories use inhomogeneously broadened, optically thick ensembles of absorbers to store a weak optical signal and employ various protocols to rephase the…