Nature research paper: Qubit teleportation between non-neighbouring nodes in a quantum network
state and have emitted a photon. Detection of one of these photons leads to false heralding of an entangled state. The second effect, double excitation, is due to the finite length of the optical pulse compared with the optical lifetime of the emitter. There is a finite chance that the communication qubit emits a photon during this pulse, is subsequently re-excited and then emits another photon, resulting in the qubit state being entangled with two photons.
To investigate the effect of this scheme, we generate entanglement on the individual links and extract the entanglement heralding events for which the PSB monitoring flagged the presence of an extra photon. For these events, we analyse the corresponding qubit measurements in the computational basis .
We identify two separate regimes: one during the optical pulse and one after the optical pulse . When a photon is detected on Alice’s PSB detector during the optical pulse, we see that the outcome 01 is most probable , showing that only one setup was in thestate and thus that both detected photons originated from Alice . The detection of PSB photons during the optical pulse thus primarily flags double excitation errors.
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