We analyze quantum correlations arising in two coupled dimer systems in the presence of independent losses and driven by a fluctuating field. For the case of the interaction being of a Heisenberg exchange type, we first analytically show the possibility for stationary entanglement and then analyze its robustness as a function of the signal-to-noise ratio of the pump. We find that for a common fluctuating driving field, stochastic resonance effects appear as function of the ratio between field strength and noise strength. The effect disappears in the case of uncorrelated or separate pumps. Our result is general and could be applied to different quantum systems ranging from electron spins in solid state, to ions trap technologies and cold atom set ups.
FLUCTUATIONS ASSISTED STATIONARY ENTANGLEMENT IN DRIVEN QUANTUM SYSTEMS
MANCINI, Stefano
2013-01-01
Abstract
We analyze quantum correlations arising in two coupled dimer systems in the presence of independent losses and driven by a fluctuating field. For the case of the interaction being of a Heisenberg exchange type, we first analytically show the possibility for stationary entanglement and then analyze its robustness as a function of the signal-to-noise ratio of the pump. We find that for a common fluctuating driving field, stochastic resonance effects appear as function of the ratio between field strength and noise strength. The effect disappears in the case of uncorrelated or separate pumps. Our result is general and could be applied to different quantum systems ranging from electron spins in solid state, to ions trap technologies and cold atom set ups.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
