Electron-Photon Quantum State Heralding Using Photonic Integrated Circuits

Recently, integrated photonic circuits have brought new capabilities to electron microscopy and been used demonstrate efficient phase modulation electron-photon correlations. Here, we quantitatively analyze the feasibility of high-fidelity high-purity quantum state heralding using a free circuit with parametric coupling, propose schemes shape useful states in different application scenarios. Adopting dissipative electrodynamics treatment, formulate framework for coupling electrons waveguide spatial-temporal modes. To avoid multimode-coupling-induced decoherence, show that proper design, interaction can be reduced single-mode quasi-TM00 mode. In limit, go beyond conventional ladder energy correlations within subspace still lead fundamental purity fidelity limit on complex optical preparations through schemes. We applications use this underlying correlation their advantage, but also imposed limitations general overcome by an experimentally feasible length, showing its promise as platform free-electron optics.5 MoreReceived 20 June 2022Revised 24 February 2023Accepted 1 2023DOI:https://doi.org/10.1103/PRXQuantum.4.020351Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasIntegrated opticsSpontaneous emissionTechniquesElectron microscopyAtomic, Molecular & OpticalCondensed Matter, Materials Applied PhysicsQuantum Information