Micromotion minimization using Ramsey interferometry
Artikel i vetenskaplig tidskrift, 2021

We minimize the stray electric field in a linear Paul trap quickly and accurately, by applying interferometry pulse sequences to a trapped ion optical qubit. The interferometry sequences are sensitive to the change of ion equilibrium position when the trap stiffness is changed, and we use this to determine the stray electric field. The simplest pulse sequence is a two-pulse Ramsey sequence, and longer sequences with multiple pulses offer a higher precision. The methods allow the stray field strength to be minimized beyond state-of-the-art levels. Using a sequence of nine pulses we reduce the 2D stray field strength to (10.5 +/- 0.8) mV m(-1) in 11 s measurement time. The pulse sequences are easy to implement and automate, and they are robust against laser detuning and pulse area errors. We use interferometry sequences with different lengths and precisions to measure the stray field with an uncertainty below the standard quantum limit. This marks a real-world case in which quantum metrology offers a significant enhancement. Also, we minimize micromotion in 2D using a single probe laser, by using an interferometry method together with the resolved sideband method; this is useful for experiments with restricted optical access. Furthermore, a technique presented in this work is related to quantum protocols for synchronizing clocks; we demonstrate these protocols here.

clock synchronization

quantum metrology

trapped ion micromotion

micromotion minimization

Ramsey interferometry

Paul trap


Gerard Higgins

Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi

Stockholms universitet

Shalina Salim

Stockholms universitet

Chi Zhang

Imperial College London

Stockholms universitet

Harry Parke

Stockholms universitet

Fabian Pokorny

University of Oxford

Stockholms universitet

Markus Hennrich

Stockholms universitet

New Journal of Physics

1367-2630 (ISSN)

Vol. 23 12 123028


Atom- och molekylfysik och optik

Annan fysik

Bioinformatik (beräkningsbiologi)



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