| 激光场的经典极限条件及其在量子门中的应用 |
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| 引用本文： | 陈平形,李承祖.激光场的经典极限条件及其在量子门中的应用[J].光子学报,2001,30(8):930-932. |
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| 作者姓名： | 陈平形 李承祖 |
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| 作者单位： | 1. 国防科技大学应用物理系;中国科技大学量子通信与量子计算开放研究实验室
2. 国防科技大学应用物理系 |
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| 摘 要： | 当一个二能级原子(在量子计算中可看成一个量子位)与一相干光场作用时,一般来说原子将与光场关联,原子不再作幺正演化.这样,在量子计算中,即使不考虑量子位与环境的耦合,量子位态也将发生消相干;但当光场的平均光子数足够大时,可忽略它们之间的关联,原子则作幺正演化.本文详细说明了这一点,并指出大的平均光子数是实现量子计算中量子门的必要条件.
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| 关 键 词： | 二能级原子 相干光场 关联 量子计算 |
| 收稿时间： | 2001-01-08 |
| 修稿时间： | 2001年1月8日 |
THE CLASSICAL LIMIT CONDITION OF LASER FIELD AND ITS APPLICATION IN QUANTUM GATES |
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| Chen Pingxing ,Li Chengzu.THE CLASSICAL LIMIT CONDITION OF LASER FIELD AND ITS APPLICATION IN QUANTUM GATES[J].Acta Photonica Sinica,2001,30(8):930-932. |
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| Authors: | Chen Pingxing Li Chengzu |
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| Institution: | Chen Pingxing 1,2,Li Chengzu 1 1 Department of Applied Physics,National University of Defence Technology,Changsha 410073 2 Laboratory of Quantum Communication and Quantum Computation,University of Science and Technology of China |
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| Abstract: | When a two-level atom (regarded as a qubit in quantum computation) interacts with a coherent photon field,the atom,in general,evolutes non-unitarily because of the entanglement between the atom and the field.In quantum computation,this will result in decoherence of qubit without interaction with environment.However,if there are a enough number of photons,the atom will evolute unitarily withoutentangelement.This paper will explain the above assertion and show that the essential condition for realizing guantum gates is that the field has a great number of photon. |
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| Keywords: | Two-level atom Coherent photon field Entanglement Quantum computation |
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