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Free-electron interactions with photonic GKP states: Universal control and quantum error correction
Gefen Baranes, S. Even-Haim, R. Ruimy, A. Gorlach, R. Dahan, A. A. Diringer, S. Hacohen-Gourgy, I. Kaminer·March 23, 2023·DOI: 10.1103/PhysRevResearch.5.043271
Physics
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Abstract
We show that the coherent interaction between free electrons and photons can be used for universal control of continuous-variable photonic quantum states in the form of Gottesman-Kitaev-Preskill (GKP) qubits. Specifically, we find that electron energy combs enable non-destructive measurements of the photonic state and can induce arbitrary gates. Moreover, a single electron interacting with multiple photonic modes can create highly entangled states such as Greenberger-Horne-Zeilinger states and cluster states of GKPs.