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We demonstrate symmetry protected bundle emission in the cavity QED systemunder the ultrastrong coupling regime. Parity symmetry of Rabi model onlypermits the super-Rabi oscillations with periodic generation of even photons incavity, which is realized by the laser driven flip of qubit and the parityconserved transitions induced by Rabi interaction. Combined with dissipation,only 2$n$-photon correlated emissions are allowed, and the correspondingpurities are significantly enhanced by the parity symmetry, due to the almostperfect suppression of bundle emissions with odd correlated photons. Theswitching of bundle emissions between even and odd correlated photons can becontrolled by manipulating the parity symmetry of system with an added magneticfield. This work extends multi-photon bundle emission to the ultrastrongcoupling regime, and offers the prospect of exploring symmetry-protectedmulti-quanta physics.

Parity-Symmetry-Protected Bundle Emission