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Environment assisted metrology with spin qubits

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FIG. 1. (a) Ideal circuit for EAM with ancillary qubits, based on a DQC1 scheme. (b) More realistic circuit, where the interaction with the field to be measured is not conditional on the probe spin
FIG. 3. (Color online) (Left) Simulations of signal decay for spin-echo sequence (red dotted and dash-dotted lines) and EAM sequence (black dashed and solid lines)
FIG. 4. (Color online) Embedding of a WAHUHA sequence in the EAM sequence. The WAHUHA is shown at the bottom, together with the “direction” of the Hamiltonian in the toggling frame.
FIG. 5. (Color online) Sensitivity of the EAM scheme normalized by the sensitivity of a spin-echo scheme in the absence of any environment spin, η/η echo,1

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