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Figure 4 | EPJ Quantum Technology

Figure 4

From: Experimenting quantum phenomena on NISQ computers using high level quantum programming

Figure 4

The Hardy’s paradox experiment. (a) The original optical setup [39] where two MZIs are combined. (b) The quantum circuit, where each particle passing through its BS is represented by a qubit evolves under the action of a \(R_{y}(\theta _{i})\) and a \(R_{y}(\pi -\theta _{i})\) gate. The annihilation cases are marked by the Toffoli gate. (c) Data from the IBM Vigo in direct comparison with theory when \(\theta =\theta _{0}=\theta _{1}\). (d) The nonlocal probability as calculated from Eq. (6) showed in percentage. (e) Experiment data for the nonlocal probability obtained from the IBMQ Vigo quantum computer with a maximum of \(\gamma =0.119\) at \(\theta =0.533\pi \), close to Hardy’s result [40]. The relative device error is estimated at 12.1% giving an absolute device error of 0.014, while the largest standard deviation is 0.015

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