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. 2019 Jan 17;21(1):80. doi: 10.3390/e21010080

Figure 2.

Figure 2

Schematic setups of Bob’s two encoding systems. (a) Bob chooses one path to encode his information by using optical switch; (b) Bob encodes his information by control phase shifters, B1 and B2. Details are described in the maintext. BS1: 50:50 beam splitter; BS2: beam splitter of which transmissivity is 1/3; PS: phase shifter