摘要
本文在Ｍａｒｋｏｖ 近似下推导了在任意温度的热库中，一个量子位（ｑｕｂｉｔ）的主方程，并由此讨论了由于振幅阻尼而引起的量子位消相干（ｄｅｃｏｈｅｒｅｎｃｅ）． 结论表明量子位的跃迁频率与热库的特征频率及截止频率的关系对消相干有明显的影响．
In this paper,we calculate the master equation of a qubit in a reservoir at arbitrary temperature with markov approximation,and discuss the decoherence of a qubit for amplitude damping.Our discussion show that the relation of transition frequency of a qubit to the characteristic frequency and cut off frequency of the reservoir may influence the qubit′s decoherence obviously.
出处
《光子学报》
EI
CAS
CSCD
2000年第1期5-8,共4页
Acta Photonica Sinica
关键词
量子计算
消相干
主方程
量子位
热库
Quantum computation
Decoherence
Markov appoximation
Master equation
