Coherence of a dynamically decoupled single neutral atom
- URL: http://arxiv.org/abs/2003.08163v1
- Date: Wed, 18 Mar 2020 11:36:56 GMT
- Title: Coherence of a dynamically decoupled single neutral atom
- Authors: Chang Hoong Chow, Boon Long Ng, Christian Kurtsiefer
- Abstract summary: We experimentally study the implementation of dynamical decoupling on an optically-trapped, spin-polarized $87$Rb atom.
We observe a strong correlation between the motional states of the atom and the qubit coherence after the refocusing.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Long qubit coherence and efficient atom-photon coupling are essential for
advanced applications in quantum communication. One technique to maintain
coherence is dynamical decoupling, where a periodic sequence of refocusing
pulses is employed to reduce the interaction of the system with the
environment. We experimentally study the implementation of dynamical decoupling
on an optically-trapped, spin-polarized $^{87}$Rb atom. We use the two
magnetic-sensitive $5S_{1/2}$ Zeeman levels, $\lvert{F=2,\ m_{F}=-2}\rangle$
and $\lvert{F=1,\ m_{F}=-1}\rangle$ as qubit states, motivated by the
possibility to couple $\lvert{F=2,\ m_{F}=-2}\rangle$ to $5P_{3/2}$ the excited
state $\lvert{F'=3,\ m'_{F}=-3}\rangle$ via a closed optical transition. With
more refocusing pulses in the dynamical decoupling technique, we manage to
extend the coherence time from 38(3)$\mu$s to more than two milliseconds. We
also observe a strong correlation between the motional states of the atom and
the qubit coherence after the refocusing, which can be used as a measurement
basis to resolve trapping parameters.
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