Weak dissipation for high fidelity qubit state preparation and
measurement
- URL: http://arxiv.org/abs/2108.12052v1
- Date: Thu, 26 Aug 2021 22:28:01 GMT
- Title: Weak dissipation for high fidelity qubit state preparation and
measurement
- Authors: Anthony Ransford and Conrad Roman and Thomas Dellaert and Patrick
McMillin and Wesley C. Campbell
- Abstract summary: We show a total qubit state preparation and measurement (SPAM) inaccuracy $epsilon_mathrmSPAM 1.7 times 10-4$ ($-38 mbox dB$)
We show experimentally that full transfer would yield an inaccuracy less than $8.0 times 10-5$ ($-41 mbox dB$)
Since this technique allows fluorescence collection for effectively unlimited periods, high fidelity qubit SPAM is achievable even with limited optical access and low quantum efficiency.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Highly state-selective, weakly dissipative population transfer is used to
irreversibly move the population of one ground state qubit level of an atomic
ion to an effectively stable excited manifold with high fidelity. Subsequent
laser interrogation accurately distinguishes these electronic manifolds, and we
demonstrate a total qubit state preparation and measurement (SPAM) inaccuracy
$\epsilon_\mathrm{SPAM} < 1.7 \times 10^{-4}$ ($-38 \mbox{ dB}$), limited by
imperfect population transfer between qubit eigenstates. We show experimentally
that full transfer would yield an inaccuracy less than $8.0 \times 10^{-5}$
($-41 \mbox{ dB}$). The high precision of this method revealed a rare ($\approx
10^{-4}$) magnetic dipole decay induced error that we demonstrate can be
corrected by driving an additional transition. Since this technique allows
fluorescence collection for effectively unlimited periods, high fidelity qubit
SPAM is achievable even with limited optical access and low quantum efficiency.
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