Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: POSTER II
MA 49.23: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster A
Nitrogen Vacancy center based nanoscale magnetometry enchanced by repetitive quantum error correction. — •Priyadharshini Balasubramanian1, Thomas Unden1, Daniel Louzon3, Martin Plenio2, Alex Retzker3, Boris Naydenov1, and Fedor Jelezko1 — 1Institute of Quantum Optics,University of Ulm — 2Institute for Theoretical Physics, University of Ulm — 3Racah Institute of Physics, The Hebrew University of Jerusalem,Israel
Nitrogen Vacancy (NV) center in diamond is proving to be an indispensible tool in numerous areas, specially NV based magnetometer has shown unprecedented sensitivity and spatial resolution owing to its long coherence time and atomic size. Such sensitive magnetic field probe has a sensitivity which is intrinsically limited by its phase memory time(δ B ∝ 1/√T*T2). Here we experimentally demonstrate the approach presented in[Arrad,G et al.PRL 112,(2014)] of combining sensing with quantum error correction, which promises to tackle noise of high frequency where dynamical decoupling fails. The experiment uses a robust nuclear spin (13C) as an auxiliary qubit to store the coherence of the sensing qubit, while the sensor(e-spin of NV)is reset. Combined with echo based sensing protocol, the proposed method is shown to correct bit flip errors on the electron spin, while sensing in the code-space in orthogonal direction.Even with a limited gate fidelity( 80%), we show significant improvement in the sensitivity even after 2 rounds of error correction.The presented method has the potential to handle complex noise, thus reaching the realm of magnetometry for detecting weak magnetic field associated with biological molecules.