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## Quantum dynamics of the rotation of small molecules

### Acta Physica Hungarica Series B, Quantum Electronics (2004-05-01) 20: 153-156 , May 01, 2004

A master equation describing the evolution of the rotational state of a diatomic homonuclear molecule interacting with an off-resonant laser field is obtained. Besides the coherent driving of two-photon induced rotational Raman transitions with an appropriately chosen laser pulse, also the effects due to spontaneous processes are taken into account. The latter are spontaneous rotational Raman transitions that lead to a decoherence in the molecular rotational quantum state.

## Deconstructing Wigner’s density matrix concerning the mind-body question

### Acta Physica Hungarica Series B, Quantum Electronics (2004-05-01) 20: 101-104 , May 01, 2004

In honor of the centennial of Eugene Wigner’s birth, a possible interpretation is given of the density matrix appearing in his classic paper, “Remarks on the Mind-Body Question”.

## Geometric phase accumulation-based effects in the quantum dynamics of an anisotropically trapped ion

### Acta Physica Hungarica Series B, Quantum Electronics (2005-09-01) 23: 125-134 , September 01, 2005

New physical effects in the dynamics of an ion confined in an anisotropic two-dimensional Paul trap are reported. The link between the occurrence of such manifestations and the accumulation of geometric phase stemming from the intrinsic or controlled lack of symmetry in the trap is brought to light. The possibility of observing in laboratory these anisotropy-based phenomena is briefly discussed.

## Direct measurement of quasiprobabilities in lossy cavities

### Acta Physica Hungarica Series B, Quantum Electronics (2004-05-01) 20: 73-76 , May 01, 2004

We show that the state of an electromagnetic field in a lossy cavity can be directly reconstructed by means of a simple scheme, allowing complete knowledge of the state of the field despite dissipation.

## Optical, symplectic and fresnel tomographies of quantum states

### Acta Physica Hungarica Series B, Quantum Electronics (2004-06-01) 20: 261-268 , June 01, 2004

The description of photon quantum states by means of probability-distribution functions (tomograms) of three different kinds (optical, symplectic and Fresnel ones) is presented. Mutual relations between the optical, symplectic and Fresnel tomograms are established. Evolution equation for states of Bose-Einstein condensate (Gross-Pitaevskii nonlinear equation) is given in the tomographic-probability representation. Entropy of solitons related to the Shannon entropy of the tomographic-probability representation is considered.

## Laser driven ion traps: Beyond the standard perturbative limit

### Acta Physica Hungarica Series B, Quantum Electronics (2004-05-01) 20: 129-132 , May 01, 2004

It is shown that a suitable unitary transformation applied to the *N*-ion Jaynes-Cummings Hamiltonian allows to go beyond the standard perturbative limit (associated with the laser intensity) which affects the rotating wave approximation (RWA).

## Continuous photodetection processes

### Acta Physica Hungarica Series B, Quantum Electronics (2004-05-01) 20: 77-80 , May 01, 2004

The theory of continuous photodetection processes [Srinivas and Davies (1981)] is modified in order to avoid inconsistencies. The new approach results in a bounded counting rate, in contrast with the previous theory.

## Simulating measurement statistics in remote state preparation

### Acta Physica Hungarica Series B, Quantum Electronics (2005-08-01) 23: 49-54 , August 01, 2005

Exact deterministic remote state preparation schemes that involve projective measurements on Alice’s side are not able to prepare arbitrary states but a restricted ensemble of states only. Instead of restoring the output state, Bob can transform his future measuring devices, and he can get the same probability amplitudes as with the original state. We show that such a simulation of measurement statistics is not possible for arbitrary states.

## Stochastically-induced quantum interference in coherently driven two-level atoms

### Acta Physica Hungarica Series B, Quantum Electronics (2004-05-01) 20: 51-58 , May 01, 2004

It is shown that stochastic perturbation can create phase correlation in a coherently driven two-level system. This correlation results in a noise-induced interference in the two-level system. One possible manifestation of the described interference is a narrow structure in resonance fluorescence spectra. Theoretical interpretation is well confirmed by preliminary experimental results.

## How to extract entanglement from a piece of solid or a bunch of neutrons

### Acta Physica Hungarica Series B, Quantum Electronics (2006-03-01) 26: 261-268 , March 01, 2006

We review how to obtain spin entangled pairs of fermions from a Fermi gas. An experiment with neutrons is proposed in order to get such pairs.