Eliminating Leakage Errors in Hyperfine Qubits
- URL: http://arxiv.org/abs/1912.13131v2
- Date: Sun, 3 May 2020 16:05:58 GMT
- Title: Eliminating Leakage Errors in Hyperfine Qubits
- Authors: D. Hayes, D. Stack, B. Bjork, A. C. Potter, C. H. Baldwin and R. P.
Stutz
- Abstract summary: Population leakage outside the qubit subspace presents a particularly harmful source of error.
We show an optical pumping scheme to suppress leakage errors in atomic hyperfine qubits.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Population leakage outside the qubit subspace presents a particularly harmful
source of error that cannot be handled by standard error correction methods.
Using a trapped $^{171}$Yb$+$ ion, we demonstrate an optical pumping scheme to
suppress leakage errors in atomic hyperfine qubits. The selection rules and
narrow linewidth of a quadrupole transition are used to selectively pump
population out of leakage states and back into the qubit subspace. Each pumping
cycle reduces the leakage population by a factor of $\sim3$, allowing for an
exponential suppression in the number of cycles. We use interleaved randomized
benchmarking on the qubit subspace to show that this pumping procedure has
negligible side-effects on un-leaked qubits, bounding the induced qubit memory
error by $\leq2.0(8)\times10^{-5}$ per cycle, and qubit population decay to
$\leq1.4(3)\times10^{-7}$ per cycle. These results clear a major obstacle for
implementations of quantum error correction and error mitigation protocols.
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