Quantum Control of Single Spins in Diamond for Nanoscale Magnetometry

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Date/Time:Thursday, 23 Jan 2014 - Thursday, 23 Jan 2014
Location:PHYSICS Hall Room 5
Channel:Condensed Matter Physics
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N.M. Nusran University of Pittsburgh, Pittsburgh, PA

Detection of weak magnetic fields with nanoscale spatial resolution is an outstanding problem in the biological and physical sciences. It has already been demonstrated that a single electron spin formed by a defect color center in diamond, known as the nitrogen-vacancy (NV) center, can serve as a highly sensitive magnetometer with nanoscale resolution even under ambient conditions. In the standard approach, however, the best precision typically demands a limited dynamic range; i.e., the maximum possible field strength Bmax has to be less than the sensor's spectral linewidth. Otherwise, a trade-off with the precision occurs, caused by increasing the measurement bandwidth and thus reducing the signal to noise ratio (SNR). The use of phase estimation algorithms (PEA) for magnetic field detection can address these issues. Moreover, unlike in the standard approach, PEA readout is linearly dependent with the field being sensed. PEA on oscillating (AC) magnetic fields can not only detect unknown field amplitudes but also allows detection of the field phase. These feature make PEA approach greatly useful for practical applications.