Open AccessOvercoming synthesizer phase noise in quantum sensing
Author(s) -
Long Guofei,
Feng Guanru,
Sprenger Peter
Publication year - 2019
Publication title -
quantum engineering
Language(s) - English
Resource type - Journals
ISSN - 2577-0470
DOI - 10.1002/que2.27
Subject(s) - phase noise , spins , noise (video) , frequency synthesizer , direct digital synthesizer , physics , electronic engineering , noise temperature , quantum noise , dephasing , computer science , phase locked loop , quantum , engineering , optics , condensed matter physics , quantum mechanics , artificial intelligence , image (mathematics)
Summary Synthesizers are widely used in various quantum information platforms as microwave or radio frequency signal sources. The synthesizer phase noise plays a sensitive role in spin dynamics, which is similar to the environment dephasing. When using spins to measure an environment magnetic field, synthesizer phase noise reduces the accuracy of the measurement because it is difficult to distinguish the effective field caused by the phase noise and the environment field. Suppressing the synthesizer phase noise is important in sensing. This work proposes a scheme to suppress the phase noise from synthesizers using two single‐spin systems in opposite static magnetic fields. The two spins are exposed to the same environment magnetic field, which is to be sensed and controlled by the same synthesizer. Two configurations of the scheme are constructed: one uses two antennas for control and detection and the other uses one antenna. Because the two spins experience the phase noise in opposites ways, the phase noise effect can be either canceled or separated from that of the environment field. Nuclear magnetic resonance platform is used to experimentally simulate the sensing process using the one‐antenna configuration. The experiment successfully eliminate the phase noise from sensing.