IOP : New techniques for a measurement of the electron’s electric dipole moment

Ho, C.J.; Yzombard, P.; Devlin, J.A.; Tarbutt, M.R.; Rabey, I.M.; Lim, J.; Sauer, B.E.; Wright, S.C.; Hinds, E.A.; Fitch, N.J.

doi:10.1088/1367-2630/ab83d2

Article
Report number	arXiv:2002.02332
Title	New techniques for a measurement of the electron’s electric dipole moment
Author(s)	Ho, C.J. (Imperial Coll., London) ; Devlin, J.A. (Imperial Coll., London ; CERN) ; Rabey, I.M. (Imperial Coll., London ; Munich, Max Planck Inst. Quantenopt.) ; Yzombard, P. (Imperial Coll., London ; Paris, Lab. Kastler Brossel) ; Lim, J. (Imperial Coll., London) ; Wright, S.C. (Imperial Coll., London) ; Fitch, N.J. (Imperial Coll., London) ; Hinds, E.A. (Imperial Coll., London) ; Tarbutt, M.R. (Imperial Coll., London) ; Sauer, B.E. (Imperial Coll., London)
Publication	2020-05-20
Imprint	2020-02-06
Number of pages	15
Note	22 pages, 11 figures
In:	New J. Phys. 22 (2020) 053031
DOI	10.1088/1367-2630/ab83d2 (publication)
Subject category	physics.atom-ph ; Other Fields of Physics
Abstract	The electric dipole moment of the electron (eEDM) can be measured with high precision using heavy polar molecules. In this paper, we report on a series of new techniques that have improved the statistical sensitivity of the YbF eEDM experiment. We increase the number of molecules participating in the experiment by an order of magnitude using a carefully designed optical pumping scheme. We also increase the detection efficiency of these molecules by another order of magnitude using an optical cycling scheme. In addition, we show how to destabilise dark states and reduce backgrounds that otherwise limit the efficiency of these techniques. Together, these improvements allow us to demonstrate a statistical sensitivity of $1.8 \times 10^{-28}$ e cm after one day of measurement, which is 1.2 times the shot-noise limit. The techniques presented here are applicable to other high-precision measurements using molecules.
Copyright/License	publication: © 2020-2025 The Author(s) (License: CC-BY-4.0) preprint: (License: arXiv nonexclusive-distrib 1.0)

$Relevant states of $^{174}$YbF and their energy separations (not to scale). The parity of the states is indicated in parentheses. Q(0) and P(1) refer to optical transitions as described in the text.$ $Overview of the experiment and interferometer states. (a) Pulsed beams of YbF molecules are produced with equal populations in the four $N=0$ sublevels. (b) Population is optically pumped using microwave, rf and optical fields into $F=0$. (c) An equal superposition of $m_F = +1$ and $m_F = -1$ is created by an rf pulse. (d) The two populated levels accumulate a relative phase due to interaction with $\bm{E}$ and $\bm{B}$ fields. (e) Population in the original superposition is projected back into $F=0$ by an rf pulse. (f) Population in $F=0$ is detected. (g) Population in $F=1$ is detected.$ $Relevant transitions for state preparation. Population in $(N, F) = (0,1)$, $(2,1)$, $(2,2_\ell)$ and $(2,2_\text{h})$ are optically pumped into $(0,0)$ via the odd-parity $J' = 1/2$ state. Population in $N=1$ is added by coupling all its hyperfine states with $(0,1)$ using a combination of one microwave field and two rf fields.$ Show more plots

Corresponding record in: Inspire

Back to search

Rekord stworzony 2022-01-22, ostatnia modyfikacja 2023-03-14

Podobne rekordy

Pełny tekst:
2002.02332 -

PDF
Ho_2020_New_J._Phys._22_053031 -

PDF

Dodaj do koszyka osobistego
Wyeksportuj jako BibTeX, MARC, MARCXML, DC, EndNote, NLM, RefWorks

CERN Document Server

Access articles, reports and multimedia content in HEP

Main menu

CERN Accelerating science