We propose a scheme for approximately and conditionally teleporting an unknown atomic-entangled statein dissipative cavity QED.It is the further development of the scheme of [Phys.Rev.A 69 (2004) 064302],where thecavi...We propose a scheme for approximately and conditionally teleporting an unknown atomic-entangled statein dissipative cavity QED.It is the further development of the scheme of [Phys.Rev.A 69 (2004) 064302],where thecavity mode decay has not been considered and the state teleportated is an unknown atomic state.In this paper,weinvestigate the influence of the decay on the approximate and conditional teleportation of the unknown atomic-entangledstate,which is different from that teleportated in [Phys.Rev.A 69 (2004) 064302] and then give the fidelity of theteleportation,which depends on the cavity mode decay.The scheme may be generalized to not only the teleportationof the cavity-mode-entangled-state by means of a singIe atom but also the teleportation of the unknown trapped-ion-entangled-state in a linear ion trap.展开更多
Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility (SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is...Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility (SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is es- sential for operations. The tuning is achieved by synchronizing the drive signal and the cavity probe signal. The error signal defined as their subtraction is amplified and used to drive a stepping motor, which in turn moves a metallic plunger in or out of the cavity by programmable logic controller (PLC). The tune speed is set to be 1kHz/s.展开更多
基金National Natural Science Foundation of China under Grant Nos.10774042 and 10474118the Natural Science Foundation of Hunan Province under Grant No.05J J0005the Science Research Fund of Educational Bureau of Hunan Province of China under Grant No.06C606
文摘We propose a scheme for approximately and conditionally teleporting an unknown atomic-entangled statein dissipative cavity QED.It is the further development of the scheme of [Phys.Rev.A 69 (2004) 064302],where thecavity mode decay has not been considered and the state teleportated is an unknown atomic state.In this paper,weinvestigate the influence of the decay on the approximate and conditional teleportation of the unknown atomic-entangledstate,which is different from that teleportated in [Phys.Rev.A 69 (2004) 064302] and then give the fidelity of theteleportation,which depends on the cavity mode decay.The scheme may be generalized to not only the teleportationof the cavity-mode-entangled-state by means of a singIe atom but also the teleportation of the unknown trapped-ion-entangled-state in a linear ion trap.
文摘Eight 500 MHz cavities are applied in the storage ring of the Shanghai Synchrotron Radiation Factility (SSRF). In order to tune the cavities for different changing parameters and operation modes, the control system is es- sential for operations. The tuning is achieved by synchronizing the drive signal and the cavity probe signal. The error signal defined as their subtraction is amplified and used to drive a stepping motor, which in turn moves a metallic plunger in or out of the cavity by programmable logic controller (PLC). The tune speed is set to be 1kHz/s.
基金The project supported by National Natural Science Foundation of China under Grant No. 10674025 and the Natural Science Foundation of Fujian Province of China under Grant No. 2006J0235
