Enhanced Quantum Memory and Sensitivity by Interfering Noise (IMAGE)
Caption
Schematic representation of destructive interference of cross-correlated noise, control sequences and experimental setup.
Detailed description (from the paper):
(a) The qubit is subjected to environmental noise δ(t). Applying a resonant drive with Rabi frequency Ω1 creates a protected dressed qubit which decoheres mainly due to ε1(t) - the amplitude noise in Ω1. Applying a second drive with modulation frequency eΩ1, Rabi frequency Ω2 and amplitude fluctuations ε2(t), reduces decoherence due to ε1(t).
(b) If the cross-correlation, c, of ε1(t) and ε2(t) is nonzero, a detuning eΩ1 = Ω1 + c Ω2 2/Ω1 tilts the effective-drive axis and induces a destructive interference of the cross-correlated noise, resulting in a doubly-dressed qubit with a longer coherence time.
(c) Measurement sequences for standard and correlated double drive (DD) protocols. (d) Experimental setup and level
scheme of the NV center
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