Sensing fields with ion in a dark state

Adam Lešundák; Tuan M. Pham; Martin Čížek; Jakub Grim; Petr Jedlička; Lukáš Podhora; Lukáš Slodička; Ondřej Číp

doi:10.1117/12.2599764

11 July 2021 Sensing fields with ion in a dark state

Adam Lešundák, Tuan M. Pham, Martin Čížek, Jakub Grim, Petr Jedlička, Lukáš Podhora, Lukáš Slodička, Ondřej Číp

Proceedings Volume 11844, Photonics for Quantum 2021; 118441A (2021) https://doi.org/10.1117/12.2599764
Event: Photonics for Quantum, 2021, Online Only

Conference Poster

Abstract

Trapped ions, as one of the pillars of progress in frequency metrology and quantum optics, require a complex experimental environment with well-defined conditions. We present that a feature called dark resonance, provided by the trapped ion itself, can be used as a versatile sensor for enhanced in-situ analysis of interacting fields. The dark resonance is formed in the lambda-type energy level scheme of a laser cooled ⁴⁰Ca⁺ ion and corresponds to a fluorescence quenching. The method uses an analysis of the detection times of photons emitted from the upper energy level, which is excited via two optical dipole transitions. The two excitation lasers are phase locked to an optical frequency comb to reduce their linewidths and for precise control of their optical frequencies within the dark resonance. The amplitudes of interacting fields are obtained using the Fourier transform of the ion fluorescence or photon correlation measurements. This paper shows that the method can be applied for sensing of electric, magnetic and electromagnetic fields. Firstly, we present the potential for frequency analysis of the secular motion of a few-ion Coulomb crystal, which corresponds to the axial static electric field of a linear ion trap. Secondly, we demonstrate the optical frequency analysis of the employed lasers driving the two transitions. In the last case we show the analysis of an alternating magnetic field at the position of single ion.

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Adam Lešundák, Tuan M. Pham, Martin Čížek, Jakub Grim, Petr Jedlička, Lukáš Podhora, Lukáš Slodička, and Ondřej Číp "Sensing fields with ion in a dark state", Proc. SPIE 11844, Photonics for Quantum 2021, 118441A (11 July 2021); https://doi.org/10.1117/12.2599764

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