Quantum computation based on a quantum switch in cavity QED |
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| Authors: | X -L Feng L C Kwek C H Lai C H Oh |
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| Institution: | (1) Department of Physics, Blk S12, National University of Singapore 2, Science Drive 3, 117542, Singapore;(2) Key Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;(3) National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, 639798, Singapore |
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| Abstract: | A feasible scheme for constructing quantum logic gates is proposed on the basis of quantum switches in cavity QED. It is shown that the light field which is fed into the cavity due to the passage of an atom in a certain state can be used to manipulate the conditioned quantum logical gate. In our scheme, the quantum information is encoded in the states of Rydberg atoms and the cavity mode is not used as logical qubits or as a communicating “bus”; thus, the effect of atomic spontaneous emission can be neglected and the strict requirements for the cavity can be relaxed. |
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