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Sensing Weak High Frequency Signals by Quantum Control

Sensing Weak High Frequency Signals by Quantum Control

Datum: 10. Oktober 2017 13:00

Ort: NWZII, 6.526

The nitrogen-vacancy (NV) center is an attractive sensor for sensing nanoscale magnetic and electric fields.
A major key to its success have been sensing protocols which enhance sensitivity to weak alternating current (AC) signals. However, current methods are either restricted to signal frequencies up to several MHz or feature limited sensitivity in the microwave frequency range.
In this talk, we study sensing schemes specifically designed to detect weak fields close to the
NV’s transition frequency which is Zeeman-tunable over a spectrum of ~ 1 - 100 GHz.
To this end, we employ dressing of the qubit to obtain sensing transitions with narrow
linewidth. Analysis of the properties of a pulsed dressing sequence enables a narrow-band, high frequency sensing
scheme. As a result, we demonstrate slow Rabi oscillations driven by a weak signal field.
The corresponding high sensitivities are limited by the T2 coherence time of the qubit
and could allow various applications. Specifically, we consider single microwave photon
detection.

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