Considering the interaction between the electromagnetic field and matter field, a concise method is used to calculate the ground-state energy of the interacting system. With the assumption of squeezed-like state, a ne...Considering the interaction between the electromagnetic field and matter field, a concise method is used to calculate the ground-state energy of the interacting system. With the assumption of squeezed-like state, a new vacuum state is obtained for the inte racting system. The energy of the new vacuum state is obviously lower than that of unperturbed vacu um state. Based on the new vacuum state, the correction to the Casimir force is obtained. The r esult shows that the contribution of the interaction is a repulsive one and the Casimir effect is attributed to both electromagnetic field and matter field. On the basis of the obtained results, th e recent experimental data can be explained reasonably.展开更多
We investigate the possibility of observing in integrated solid-state systems the dynamical Casimir effect,in which photons are created out of vacuum.We use a transmission line resonator on a superconducting chip as t...We investigate the possibility of observing in integrated solid-state systems the dynamical Casimir effect,in which photons are created out of vacuum.We use a transmission line resonator on a superconducting chip as the microwave cavity and modulate its properties by coupling it to carefully designed Josephson devices.We evaluate the effect of main decoherence sources and show that our design offers a promising system for experimentally demonstrating the dynamical Casimir effect.Moreover,we also study the squeezing properties of the created photon field and how they depend on the dissipation.展开更多
基金Key Project of Chinese Ministry of Education(211059)Innovation Program of Shanghai Municipal Education Commission(11zz123)Program of Shanghai Normal University(DXL124)
文摘Considering the interaction between the electromagnetic field and matter field, a concise method is used to calculate the ground-state energy of the interacting system. With the assumption of squeezed-like state, a new vacuum state is obtained for the inte racting system. The energy of the new vacuum state is obviously lower than that of unperturbed vacu um state. Based on the new vacuum state, the correction to the Casimir force is obtained. The r esult shows that the contribution of the interaction is a repulsive one and the Casimir effect is attributed to both electromagnetic field and matter field. On the basis of the obtained results, th e recent experimental data can be explained reasonably.
基金supported by the National Natural Science Foundation of China(Grant No.11174270)the National Basic Research Program of China(Grant Nos.2011CB921204 and 2011CBA00200)+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB01000000)ZHOU Zheng Wei gratefully acknowledges the support of theK.C.Wong Education Foundation,Hong Kong
文摘We investigate the possibility of observing in integrated solid-state systems the dynamical Casimir effect,in which photons are created out of vacuum.We use a transmission line resonator on a superconducting chip as the microwave cavity and modulate its properties by coupling it to carefully designed Josephson devices.We evaluate the effect of main decoherence sources and show that our design offers a promising system for experimentally demonstrating the dynamical Casimir effect.Moreover,we also study the squeezing properties of the created photon field and how they depend on the dissipation.
