Universal quantum computation using all-optical hybrid encoding
Guo Qia), b) , Cheng Liu-Yonga) , Wang Hong-Fub) , Zhang Shoua), b)† 
Universal quantum computation using all-optical hybrid encoding |
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Guo Qi
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| Schematic diagram of the two-qubit controlled-NOT gate.BSb represents a balanced beam splitter and BSu is a highly unbalanced beam splitter used to achieve single-photon subtractions. D stands for the ordinary photon detector for distinguishing the presence or absence of photons without resolving the photon’s number. H α represents the transformation |± α 〉→ 𝒩 ±(| α 〉 ± | – α 〉). σ c(t) stands for the Pauli rotation on control (target) qubit dependent on the feedforward result of the auxiliary’s ± α measurement. |
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