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Toida et al. claim in their recent article [Phys. Rev. Lett. 110, 066802(2013)] that they `report a direct observation of vacuum Rabi splitting in aGaAs/AlGaAs double quantum dot (DQD) based charge qubit coupled with asuperconducting coplanar waveguide (CPW) resonator'. In this comment, wechallenge the main claims made in their paper and show that their results: a)do not provide any evidence of vacuum Rabi oscillations and b) do not provideany direct evidence of vacuum Rabi splitting.

Comment on `Vacuum Rabi Splitting in a Semiconductor Circuit QED System' by Toida et al., Phys. Rev. Lett. 110, 066802 - Published 6 February 2013