In this survey, we present single-photon states of electromagnetic felds, discuss discrete measurements of a single-photonfeld, show how a linear quantum system responds to a single-photon input, investigate how a coh...In this survey, we present single-photon states of electromagnetic felds, discuss discrete measurements of a single-photonfeld, show how a linear quantum system responds to a single-photon input, investigate how a coherent feedback network canbe used to manipulate the temporal pulse shape of a single-photon state, present single-photon flter and master equations,and fnally discuss the generation of Schrödinger cat states by means of photon addition and subtraction.展开更多
基金The author thanks financial support from the Hong Kong Research Grant Council(Nos.15208418,15203619)the Shenzhen Fundamental Research Fund,China(No.JCYJ20190813165207290)the CAS AMSS-polyU Joint Laboratory of Applied Mathematics.
文摘In this survey, we present single-photon states of electromagnetic felds, discuss discrete measurements of a single-photonfeld, show how a linear quantum system responds to a single-photon input, investigate how a coherent feedback network canbe used to manipulate the temporal pulse shape of a single-photon state, present single-photon flter and master equations,and fnally discuss the generation of Schrödinger cat states by means of photon addition and subtraction.
文摘报道了脉冲序列(pulsetrain,PT)控制电感电流连续导电模式(continuous conduction mode,CCM)Buck变换器中存在的低频波动现象,研究了其产生机理和抑制方法.时域仿真结果和输出电压与电感电流的相空间轨迹图表明,输出滤波电容等效串联电阻(equivalent series resistance,ESR)是影响PT控制CCMBuck变换器控制性能的重要因素.当ESR值为零或很小时,PT控制CCMBuck变换器将出现由于输出电压调整不及时而呈现的低频波动现象;随着ESR的增大,PT控制CCMBuck变换器工作在混沌状态,控制器能够及时调整输出电压,低频波动现象得到有效抑制.实验结果验证了理论分析和仿真结果的正确性.
