<Abstract>An alternative scheme is proposed for the generation of n-qubit W states of superconducting quantum interference devices (SQUID) in cavity QED.In this scheme,Raman coupling of two lower flux states of ...<Abstract>An alternative scheme is proposed for the generation of n-qubit W states of superconducting quantum interference devices (SQUID) in cavity QED.In this scheme,Raman coupling of two lower flux states of SQUID system is achieved via a microwave pulse and the cavity mode.Conditioned on no photon leakage from the cavity,the n-qubit W state can be generated whether the effective coupling parameters of the SQUID to cavity mode and classical microwave fields are the same or different.Our strictly numerical simulations of the time evolution of the system including decay show that the success probability of our scheme is almost unity and the interaction time is on the order of 10^(-9) s.The scheme can also be used to generate the Schrdinger cat states of multi-SQUID.展开更多
<正> This paper presents an alternative scheme to realize the storage of entangled states for multiple trappedions including W state,Bell states,and GHZ stares even with ions which exchange vibrational energy wi...<正> This paper presents an alternative scheme to realize the storage of entangled states for multiple trappedions including W state,Bell states,and GHZ stares even with ions which exchange vibrational energy with a heatingsurrounding.Our scheme requires that the ions be simultaneously excited by two laser beams with different frequencies.In this scheme the vibrational degrees of freedom are only regarded as intermediate states and the ions exchange energyvia the mediation of the vibration of the vibrational mode in coupling processes.The scheme is insensitive to both theinitial vibrational state and heating if the system remains in the Lamb-Dicke regime.Since the effective Rabi frequencyhas a small dependence on the vibrational quantum number the heating will have no direct effect on the internal stateevolution.展开更多
We propose a scheme for controlling the coherent transport of a single electron through a closed three-level structure in coupled quantum dots.The coherent transport is externally controlled by applying a weak few-cyc...We propose a scheme for controlling the coherent transport of a single electron through a closed three-level structure in coupled quantum dots.The coherent transport is externally controlled by applying a weak few-cycle pulse with an adjustable carrier-envelope phase(CEP).It is revealed numerically that there exists a significant dependence of the electron transport on the CEP.Our results illustrate the potential to utilize few-cycle pulses for the excitation in coupled quantum dot systems through control of the CEP,as well providing guidance in the design for possible experimental implementations.展开更多
基金supported by National Fundamental Research Program of China under Grant No.2005CB724508National Natural Science Foundation of China under Grant Nos.10575040,10634060,60478029,and 90503010
文摘<Abstract>An alternative scheme is proposed for the generation of n-qubit W states of superconducting quantum interference devices (SQUID) in cavity QED.In this scheme,Raman coupling of two lower flux states of SQUID system is achieved via a microwave pulse and the cavity mode.Conditioned on no photon leakage from the cavity,the n-qubit W state can be generated whether the effective coupling parameters of the SQUID to cavity mode and classical microwave fields are the same or different.Our strictly numerical simulations of the time evolution of the system including decay show that the success probability of our scheme is almost unity and the interaction time is on the order of 10^(-9) s.The scheme can also be used to generate the Schrdinger cat states of multi-SQUID.
基金The project partially supported by the National Fundamental Research Program of China under Grant No. 2005CB724508 and National Natural Science Foundation of China under Grant Nos. 60478029, 10575040, and 90503010 Acknowledgments The authors thank Prof. Ying Wu for many enlighten- ing discussions.
基金The project supported by National Fundamental Research Program of China under Grant No.2005CB724508National Natural Science Foundation of China under Grant Nos.60478029,90503010,10634060,and 10575040
基金The project supported in part by National Nat, ural Science Foundation of China under Grant No. 60478029 We would like to thank professor Wu Ying for enlightening discussions
基金The project supported by the State Key Basic Research Development Program of China under Grant No. 20010B309310 and National Natural Science Foundation of China under Grant Nos, 60478029, 90103026, and 10125419,Acknowledgment We would like to thank Prof. Wu Ying for many enlightening discussions.
文摘<正> This paper presents an alternative scheme to realize the storage of entangled states for multiple trappedions including W state,Bell states,and GHZ stares even with ions which exchange vibrational energy with a heatingsurrounding.Our scheme requires that the ions be simultaneously excited by two laser beams with different frequencies.In this scheme the vibrational degrees of freedom are only regarded as intermediate states and the ions exchange energyvia the mediation of the vibration of the vibrational mode in coupling processes.The scheme is insensitive to both theinitial vibrational state and heating if the system remains in the Lamb-Dicke regime.Since the effective Rabi frequencyhas a small dependence on the vibrational quantum number the heating will have no direct effect on the internal stateevolution.
基金The project partially supported by National Fundamental Research Program of China under Grant No. 2005CB724508 and National Natural Science Foundation of China under Grant Nos. 60478029, 90503010, and 10575040 . We would like to thank Prof. Ying Wu for many enlightening discussions.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos 11074036 and 11374050the Qing Lan project of Jiangsu Province.
文摘We propose a scheme for controlling the coherent transport of a single electron through a closed three-level structure in coupled quantum dots.The coherent transport is externally controlled by applying a weak few-cycle pulse with an adjustable carrier-envelope phase(CEP).It is revealed numerically that there exists a significant dependence of the electron transport on the CEP.Our results illustrate the potential to utilize few-cycle pulses for the excitation in coupled quantum dot systems through control of the CEP,as well providing guidance in the design for possible experimental implementations.
