Fig. 3: Heterodyne detection is compatible with dynamical decoupling sequences.
From: Heterodyne sensing of microwaves with a quantum sensor
a A decoupling sequence creates from the initial two-level system, with transition ωs, a Mollow triplet with two detection sidebands at ωs ± Ωdd, where \({{{\Omega }}}_{{\rm{dd}}}=\frac{\pi }{{\tau }_{{\rm{dd}}}}\), and a low frequency transition Ωdd. A MW field resonant to such a sideband is rotating in the spin’s reference frame. b The phase of the oscillating field Ωy (t) is sensed relative to the pulse sequence, here CPMG (πx-pulses). c Demodulated signal spectra of three heterodyne measurements, each with one Mollow triplet transitions. Blue: resonant transition ωs, green: RF-frequency Ωdd and red: Mollow sideband ωs + Ωdd. For comparison, we normalized the frequency axis to the sampling rate 1/T with TRF-CPMG = 23.094518 μs, TMW-FID = 4.505507 μs, and TMW-CPMG = 70.681507 μs.
