Feasibility study of the quantum XOR gate based on coupled asymmetric semiconductor quantum dots |
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| Institution: | 1. Department of Radiology, Zhongshan Hospital of Fudan University, Fudan University, No 130, Dongan Rd, Xuhui District, Shanghai, 200032, P.R. of China;2. Xuzhou Mining Group General Hospital, radiology department, Xuzhou, Jiangsu, 221000, P.R. of China;3. Shanghai Aitrox Technology Corporation Limited, Shanghai, 200032, P.R. of China;4. Department of Radiology, Shanghai Institute of Medical Imaging, Zhongshan Hospital of Fudan University, Fudan University, No 130, Dongan Rd, Xuhui District, Shanghai, 200032, P.R. of China;5. Department of Radiology, Zhongshan Hospital of Fudan University, Fudan University;6. Department of Radiology, Zhongshan Hospital of Fudan University, Fudan University, No138, Fenglin Rd, Xuhui District, Shanghai, 200032, P.R. of China;1. Department of Nursing, Shengjing Hospital of China Medical University, Shenyang, Liaoning, 110000, China;2. Department of Oncology, Shengjing Hospital of China Medical University, Shenyang, Liaoning, 110000, China;1. Department of Physics, National Taiwan University, Taipei, Taiwan;2. Quantum Computing Research Center, Hon Hai Research Institute, Taipei, Taiwan;3. Department of Information and Computer Engineering, Chung Yuan Christian University, Chungli, Taiwan;4. Department of Physics, National Sun Yat-sen University, Kaohsiung, Taiwan;5. Department of Mathematics & Statistics, University of Guelph, Guelph N1G 2W1, ON, Canada;6. Institute for Quantum Computing, University of Waterloo, Waterloo N2L 3G1, ON, Canada;7. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;8. Department of Optoelectric Physics, Chinese Culture University, 55 Hwa-Kang Road, Yang-Ming-Shan, Taipei, Taiwan;9. Graduate Institute of Applied Physics and NTU-IBM Quantum Hub, National Taiwan University, Taipei, Taiwan |
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| Abstract: | We propose an implementation of the quantum XOR (controlled-NOT) gate on the basis of coupledasymmetricquantum dots. Results of our numerical simulations show that the coupling constant of the dipole–dipole interaction and the probability of spontaneous emission can be tuned over a wide range by a proper choice of the potential profile, material parameters, and distances between the dots. We argue that the use of the asymmetric potential profile provides better conditions for having the Ising-type interaction between the dots than earlier proposed schemes based on regular symmetric quantum dots biased with an electric field. Our system gives better resolution of different quantum states, avoids any undesirable time evolution of these states, and can be driven with a femtosecond laser. The qubit manipulation and time coherency requirements are also discussed. |
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