Measuring the environment of a Cs qubit with dynamical decoupling
sequences
- URL: http://arxiv.org/abs/2303.06983v3
- Date: Fri, 23 Jun 2023 05:48:19 GMT
- Title: Measuring the environment of a Cs qubit with dynamical decoupling
sequences
- Authors: Sabrina Burgardt, Simon B. J\"ager, Julian Fe{\ss}, Silvia Hiebel,
Imke Schneider, Artur Widera
- Abstract summary: We report the experimental implementation of dynamical decoupling on a small, non-interacting ensemble of up to 25 optically trapped, neutral Cs atoms.
ACPMG sequence with ten refocusing pulses increases the coherence time of 16.2(9) ms by more than one order of magnitude to 178(2) ms.
Our findings point toward noise spectroscopy of engineered atomic baths through single-atom dynamical decoupling.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report the experimental implementation of dynamical decoupling on a small,
non-interacting ensemble of up to 25 optically trapped, neutral Cs atoms. The
qubit consists of the two magnetic-insensitive Cs clock states $\left| F=3,
m_F=0 \right>$ and $\left|F=4, m_F=0\right>$, which are coupled by microwave
radiation. We observe a significant enhancement of the coherence time when
employing Carr-Purcell-Meiboom-Gill (CPMG) dynamical decoupling. A CPMG
sequence with ten refocusing pulses increases the coherence time of 16.2(9) ms
by more than one order of magnitude to 178(2) ms. In addition, we make use of
the filter function formalism and utilize the CPMG sequence to measure the
background noise floor affecting the qubit coherence, finding a power-law noise
spectrum $1/\omega^\alpha$ with $\mathit{\alpha} = 0.89(2)$. This finding is in
very good agreement with an independent measurement of the noise in the
intensity of the trapping laser. Moreover, the measured coherence evolutions
also exhibit signatures of low-frequency noise originating at distinct
frequencies. Our findings point toward noise spectroscopy of engineered atomic
baths through single-atom dynamical decoupling in a system of individual Cs
impurities immersed in an ultracold $^{87}$Rb bath.
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