1 中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800
2 中国科学院大学, 北京 100039
3 上海师范大学数理学院, 上海 200234
用无退相干子空间的方法抑制集体退相干,实现不受比特反转错 误影响的通用量子计算。 该方案基于腔电动力学系统,用囚禁于腔中的2个相邻原子编码1个逻辑比特,构造出抑制集体比特 反转错误的4维无退相干子空间。通过调节外加光场与腔的耦合,在无退相干子空间中完成了2个非 对易的单比特操作和控制相位门,实现了克服集体比特反转错误的通用量子计算。
量子光学 通用量子计算 无退相干子空间 比特反转错误 quantum optics universal quantum computation decoherence-free subspace bit-flip error
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Sciences, Beijing 100039, China
3 Department of Physics, Shanghai Normal University, Shanghai 200234, China
We investigate the reflected field for few-cycle ultra-short laser pulses propagating through resonant media embedded within wavelength-scale structures. Full-wave Maxwell–Bloch equations are solved numerically by using the finite-difference time-domain method. The results show that the spectral feature of the reflected spectrum is determined by the Bragg reflection condition, and that the periodic structure of a dense atomic system can be regarded as a one-dimensional photonic crystal and even as a highly reflective multilayer film. Our study explains the suppression of the frequency shifts in the reflected spectrum based on the Bragg reflection theory and provides a method to control the frequency and frequency intervals of the spectral spikes in the reflected spectrum.
320.2250 Femtosecond phenomena 320.7150 Ultrafast spectroscopy 020.1335 Atom optics Chinese Optics Letters
2015, 13(12): 123201
