The experimental setup of delayed-choice scheme with dual selections (IMAGE)
Caption
By adding two ancilla qubits (represented by blue and red lines), the dual-selection of input and output beam splitters is realized. The first ancilla qubit (blue line) and the system qubit are prepared as a maximally entangled state after passing through the CNOT gate, described by the state |ψa1s⟩. H4 gate can be optionally placed, and whether H4 gate is applied determines the measurement basis of the first ancilla qubit, which realizes the selection of the input beam splitter. And the second ancilla qubit controls H3 gate, serving as the second controlled-Hadamard gate. The quantum state of ancilla qubit after passing through H2 gate is |ψa2⟩. A tunable phase shifter φ adds the relative phase eiφ on the state |1⟩. H1-H4: Hadamard gates.
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