采用非旋波近似,讨论了热库中二态量子系统在外加驱动场作用下的退相干性.利用系统的演化酉算符,计算出了二态量子系统的约化密度矩阵非对角矩阵元.结果表明:二态量子系统的量子相干性与其初始状态、热库和外加驱动场的频率、二态量子系统与热库和驱动场的耦合强度等因素有关.确定了外加驱动场与退相干性之间的关系,并得到了外加驱动场的时间演化满足特定条件时,可保持系统的相干性.
参考文献
| [1] | Unruh W G.Maintaining coherence in quantum computers[J].Phys.Rev.A,1995,51(2):992-997. |
| [2] | Duan Luming,Guo Guangcan.Reducing decoherence in quantum-computer memory with all quantum bits coupling to the same environment[J].Phys.Rev.A,1998,57(2):737-741. |
| [3] | Shor P W.Scheme for reducing decoherence in quantum computer memory[J].Phys.Rev.A,1995,A52(4):R2493-R2496. |
| [4] | Meng H X,Chai C L.Phase properties of coherent light in the Jaynes-Cummings model[J].Phys.Lett.A,1991,155(8,9):500-505. |
| [5] | Tan Xia,et al.Influence of intrinsic decoherence on the quantum statistical properties of light field[J].Chinese Journal of Quantum Electronics(量子电子学报),2008,25(3):340-345(in Chinese). |
| [6] | Gao Feng,Xiao Detao,Zhang Dengyu,et al.The quantum coherence of Raman process of two-level atom interacting with two-mode fields[J].Laser Journal(激光物理),2009,30(4):25-27 (in Chinese) |
| [7] | Zhang Caiyun,Sachuerfu,Gerile.Quantum entanglement in a system of squeezed coherent state light field interacting with two entangled atoms[J].Chinese Journal of Quantum Electronics(量子电子学报),2010,27(1):57-62 (in Chinese). |
| [8] | Duan Luming,Guo Guangcan.Preserving coherence in quantum computation by pairing quantum bits[J].Phys.Rev.Lett.,1997,79:1953-1956. |
| [9] | Chen Pingxing,Li Chengzu,et al.Decoherence of qubit in a reservoir at arbitrary temperature[J].Acta Optica Sinica (光学学报),2000,29(1):5-8 (in Chinese). |
| [10] | Hao Sanru,Wang Luya.Suppression of decoherence in two-state quantum systems interacting with bath through an external controllable field[J].Acta Physica Sinica(物理学报),2000,49(4):610-614 (in Chinese). |
| [11] | Zhang Dengvu.Elimination of two-level atom's decoherence by an external driving field in degenerate two-photon processes[J].Acta Physica Sinica(物理学报),2002,51(3):532-535 (in Chinese) |
| [12] | Zhang Dengyu.The suppression of two-level atom's decoherence through an external driving field in degenerate multi-photon processes[J].Acta Photonica Sinica(光子学报),2002,31(5):537-540(in Chinese). |
| [13] | Tan Xia,Zhang Chengqiang,Xia Yunjie.Entanglement and intrinsic decoherence in the interaction between two-mode field and atom[J].Acta Optica Sinica(光学学报),2006,55(5):2263-2268 (in Chinese). |
| [14] | Tan Xia,Zhang Chengqiang,Xia Yunjie.Quantum properties of atom and two-mode filed with intrinsic decoherence[J].Chinese Journal of Quantum Electronics(量子电子学报),2007,24(1):63-67(in Chinese). |
| [15] | Zhang Chengqiang,Tan Xia,Xia Yunjie.The time-evolution of entanglement in the interacting system of the atom and coherence field with phase decoherence[J].Journal of Atomic and Molecular Physics(原子与分子物理学报),2007,24(4):757-761 (in Chinese). |
| [16] | Leonard Mandel,Emil Wolf.Optical Coherence and Quantum Optics[M].Cambridge University Press,1995,519-520. |
| [17] | Hillery M,O'Connell R F,Scully M O,et al.Distribution functions in physics:fundamentals[J].Phys.Rep.,1984,106(3):121-167. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%