基于两节点间信息互传的量子特性  

Quantum Properties of Information Each Other Between Two Nods

作　　者：邬云文[1] 邓艳[1] 周小清[1] 曹广涛[1] 钟宏华[1] 

机构地区：[1]吉首大学物理与机电工程学院,湖南吉首416000

出　　处：《光子学报》2016年第3期62-69,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11447240);湖南省自然科学基金(Nos.13JJ3092;15JJ6092)资助~~

摘　　要：运用全量子理论,对腔耦合系统构建的两个节点,考虑节点内腔模与量子位(qubit)的耦合,结合数值计算,用熵表示信源的不确定性,对信源发出的信息进行度量,研究了两个节点相互进行信息传输过程的熵演化.通过两能级粒子与腔模的耦合强度、腔-腔之间的跃迁耦合系数和失谐量三个参数对熵变化进行分析,结论表明在共振条件下,节点间相互传输信息过程中,耦合双腔构成的两个节点熵呈现准周期性坍塌与复苏振荡变化特征,节点1与节点2熵的峰值交替出现;两个节点之间用跳跃频率λ/2π的光子作为信息传送的数椐总线,失谐使两个节点内量子位的一个频率高,一个频率低,无论先操纵哪一个量子位,在系统稳定工作状态下,量子态演化的信息传递方向总是从频率快的量子位向频率慢的量子位传递,此特性可扩展至多量子位之间量子信息的传递.用于两个节点间的远程操控.Considering a coupled cavity system composed of two sub-systems,which are constituted by the cavity modes and qubits.Combing the quantum theory and numerical calculation,the amount was described to transfer message and the uncertainty of the information source by using entropy.The entropy evolution of the two nodes with respect to different coupling strengths between the two-level particle and cavity mode,transition coupling of cavity-cavity and detuning were studied.For the resonance state,it is found that the two qubits exhibit quasi-periodic collapse and revival,the peak of entropy of qubits 1and 2appear alternately.For the non-resonance state,the frequency of qubits is higher inside the node,low frequency of anther by discord.With frequency hoppingλ/2πbetween the two nodes,the photon is in mishan bus as information transmission.No matter which qubit was adjusted,the information of quantum state evolution always transfers from the qubit with high frequency to the qubit with low frequency.The results can be extended to the transmission of quantum information among multiple qubits.

关 键 词：量子光学 量子信息 耦合腔 熵 量子态操控 失谐 量子比特 

分 类 号：O413.2[理学—理论物理] O562[理学—物理]