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CATEGORY:
Theor./Math. Physics Seminar
TITLE:
Novel Sensing Schemes for Frequency Tracking and Resolution
Speaker:
Alex Retzker
Affiliation:
-
WHEN:
Sunday
14/05/2017, 14:30
WHERE:
Lewiner, Seminar Room (412)
Organizer:
-
Site:
-
Remarks:
-

Abstract

Precise time-keeping is critical to measurements of energy, distance, frequency and fundamental constants. In spectroscopy, time-keeping precision defines the spectral resolution. Ultimately, measurement accuracy is limited by the stability of the measuring clock. In quantum metrology, where the phase of a qubit is used to detect external fields, the qubit coherence time defines the clock stability, and therefore the measurement linewidth and precision. In this talk I will present a quantum sensing protocol for classical fields where the measurement linewidth goes beyond the sensor coherence time and is limited by the stability of a classical oscillator. Using this technique it is possible to observe a precision in frequency estimation which scales as T^{-3/2}. The high spectral resolution diamond magnetometer was applied to sensing of nanoscale magnetic fields with an intrinsic frequency resolution of 600µHz with single quantum coherent spins in diamond.

FaLang translation system by Faboba