We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field.We show that the two entangled atoms become completely disentangled in a finite time and that the lost in...We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field.We show that the two entangled atoms become completely disentangled in a finite time and that the lost information cannot return to the atomic system when the mean photon number of the thermal field exceeds a critical value (3.3584),even though the whole system is lossless.Then we study how the detuning between the atomic transition frequency and the field frequency and the disparity between two coupling rates would affect the evolution of the entanglement of the atomic system.展开更多
In this paper,we study the entanglement dynamics of atoms locally coupled to a cavity field.By studying two different models within the framework of cavity QED,we show that the so-called atomic entanglement sudden dea...In this paper,we study the entanglement dynamics of atoms locally coupled to a cavity field.By studying two different models within the framework of cavity QED,we show that the so-called atomic entanglement sudden death always occurs if initially the cavity field is in the thermal state,in clear contrast with that in the vacuum state where the same entanglement decay is in infinite time.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.10974028)the Natural Science Foundation of Fujian Province of China (Grant No.2009J06002)the Funds from the State Key Laboratory Breeding Base of Photocatalysis
文摘We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field.We show that the two entangled atoms become completely disentangled in a finite time and that the lost information cannot return to the atomic system when the mean photon number of the thermal field exceeds a critical value (3.3584),even though the whole system is lossless.Then we study how the detuning between the atomic transition frequency and the field frequency and the disparity between two coupling rates would affect the evolution of the entanglement of the atomic system.
基金Project supported by National Natural Science Foundation of China (Grant No 10774088)
文摘In this paper,we study the entanglement dynamics of atoms locally coupled to a cavity field.By studying two different models within the framework of cavity QED,we show that the so-called atomic entanglement sudden death always occurs if initially the cavity field is in the thermal state,in clear contrast with that in the vacuum state where the same entanglement decay is in infinite time.
