Description
We propose a scheme to compute Pauli error rates in photonics-based quantum error correction
using experimental observables of single photons produced from quantum emitters. We show that
first-order coherence measurements and first-order cross correlations—which can be implemented
using photon counting—can extract single-photon and entangled single-photon wavefunctions in the
presence of imperfections due to photon distinguishability, laser noise, and photon loss. Leverag-
ing this, we show that the wavefunction of any entangled state of noisy photons produced from a
single quantum emitter can be expressed in matrix–product-state form and can be used to ana-
lytically compute the expectation value of the stabilizer generators of the corresponding entangled
state. From this we obtain analytic expressions for the Pauli error probabilities in terms of the
photon noise parameters. Furthermore, we calculate Pauli error maps for entangled photons after
undergoing Bell-state measurements in terms of these parameters. Our work provides a pathway
for systematically integrating experimentally measured photon imperfections into quantum error
correction for measurement-based and fusion-based photonics quantum computing
| I am the presenting author | Yes |
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