Giving a boost to atoms

S. M. Barnett

Arnab Mukherjee, Soham Sen, Sunandan Gangopadhyay

In this study, we investigate the effect of the Lorentz transformation on the measures of quantum coherence in an entangled atomic system. Here, we consider the effect of this relativistic boosts on two-particle entangled generalized Gaussian wave packets in two scenarios. In the first scenario, we consider that the relativistic boost affects the one particle and other remains unaffected while in the second scenario, we consider that both the particles are affected by the effect of the relativistic boost. The coherence of the wave function as measured by the boosted observer is studied as a function of the boost parameter and the width of the Gaussian wave packets. Using various formulations of coherence, it is shown that in general the coherence decays with increase in the width of the Gaussian wave packet, higher values of boost parameter, and the number of particles on which boost is applied.

Peter B. Sellin, THOMAS W. MOSSBERG

Summary form only given. We experimentally demonstrate field-enhanced lasing, i.e., lasing made possible through an excitation-field-mediated boost in the gain normally realizable on a weakly inverted transition. The excitation field responsible for the boost in gain, the helper field couples the lasing transition to another transition in a cascade-type three-level atomic system. The gain boosting operative in our driven three-level-atom experiments derives from the same essential physics that gives rise to the gain that has recently attracted so much attention. In terms of achieving laser operation in new regimes, gain boosting may play much the same role as inversionless gain.

Anonymous

Fatemeh Ahmadinouri, Mehdi Hosseini, Farrokh Sarreshtedari

In this paper, we have proposed and demonstrated a new method of atomic population transfer.The transition dynamic of a two-level system is studied in a full quantum description of the Jaynes-Cummings model.Solving the timedependent Schrödinger equation, we have investigated the transition probabilities numerically and analytically by using a sudden boost of the laser frequency.The results show that complete population transfer can be achieved by adjusting the time of the frequency boost.

Christopher J. Foot