A single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field is considered. The degree of entanglement between the quantized field and the single-Cooper-pair box is exami...A single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field is considered. The degree of entanglement between the quantized field and the single-Cooper-pair box is examined by using the field entropy. It is found that the collapse and revival phenomenon can exist in this system, the entropy reaches its local minimum at one-half of the quiescent period, and the larger the entropy, the greater the entanglement is.展开更多
In this paper,the Josephson equation and its autonomous case are considered.It isshown that for |α|【1 and β】γ】1 or β【γ【-1,there is no periodic solution of the autonomousJosephson equation,For the nonautonomo...In this paper,the Josephson equation and its autonomous case are considered.It isshown that for |α|【1 and β】γ】1 or β【γ【-1,there is no periodic solution of the autonomousJosephson equation,For the nonautonomous case,some suffcient conditions for the existence ofperiodic solutions are given.展开更多
文摘A single-Cooper-pair box biased by a classical voltage and also irradiated by a single-mode quantized field is considered. The degree of entanglement between the quantized field and the single-Cooper-pair box is examined by using the field entropy. It is found that the collapse and revival phenomenon can exist in this system, the entropy reaches its local minimum at one-half of the quiescent period, and the larger the entropy, the greater the entanglement is.
文摘In this paper,the Josephson equation and its autonomous case are considered.It isshown that for |α|【1 and β】γ】1 or β【γ【-1,there is no periodic solution of the autonomousJosephson equation,For the nonautonomous case,some suffcient conditions for the existence ofperiodic solutions are given.
