We describe a scheme that allows for the generation of any desired N-photonstate on demand. Under ideal conditions, this requires only N single photonsources, laser pulses and linear optics elements. First, the sources should beinitialised with the help of single-qubit rotations and repeat-until-successtwo-qubit quantum gates [Lim et al., Phys. Rev. Lett. 95, 030305 (2005)].Afterwards, the state of the sources can be mapped onto the state of N newlygenerated photons whenever needed.
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机译：我们描述了一种允许按需生成任何所需N-光子态的方案。在理想条件下，这仅需要N个单光子源，激光脉冲和线性光学元件。首先，应在单量子位旋转和重复直到成功的双量子位量子门的帮助下初始化源[Lim et al。，Phys。牧师95，030305（2005）]。之后，可以在需要时将源的状态映射到N个新生成的光子的状态。
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