Abstract
Reply to 'Enhancing a phase measurement by sequentially probing a solid-state system'.
Highlights
Knott et al.[1] argue in their comment on our recently published study[2] that the enhancement of phase sensitivity is obtained by applying a phase shift twice, and not from the entanglement
In our work[2], two spins of different physical realization are employed, and we demonstrate that their entangled state can give higher-phase statistical precision than their independent states
Due to the energy structure of this four-level system, the used microwave pulse can only manipulate the state of electron spin, and the used radio frequency pulse can only manipulate the state of nuclear spin
Summary
Knott et al.[1] argue in their comment on our recently published study[2] that the enhancement of phase sensitivity is obtained by applying a phase shift twice, and not from the entanglement. In our work[2], two spins of different physical realization (an NV electron spin and its proximal 13C nuclear spin) are employed, and we demonstrate that their entangled state can give higher-phase statistical precision than their independent states. The principle of quantum metrology works for all these external parameters, as it works for our encoded phases.
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