Noiseless linear amplification for the single-photon entanglement of arbitrary polarization–time-bin qudit<xref rid="cpb_28_1_010302fn1" ref-type="fn">*</xref> <fn id="cpb_28_1_010302fn1"> <label>*</label> <p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11474168 and 11747161), the Priority Academic Program Development of Jiangsu Higher Education Institutions, China, and the China Postdoctoral Science Foundation (Grant No. 2018M642293).</p> </fn>

Noiseless linear amplification for the single-photon entanglement of arbitrary polarization–time-bin qudit* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474168 and 11747161), the Priority Academic Program Development of Jiangsu Higher Education Institutions, China, and the China Postdoctoral Science Foundation (Grant No. 2018M642293).

Chen Ling-Quan^{1, 2}, Sheng Yu-Bo^{3, 4}, Zhou Lan^{1, 3, †}

The fidelity F′ as a function of the transmittance t of the VBSs with different initial fidelity F = 0.2, 0.4, 0.6, and 0.8. The smaller t is, the higher value F′ will achieve. When t → 0, F′ under arbitrary initial fidelity F will be close to 1.