Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.160503
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Funding
- Professional Research Experience Program (PREP)
- National Science Foundation Graduate Research Fellowship [DGE 1650115]
- National Research Council Postdoctoral Fellowship
- IARPA
- NIST Quantum Information Program
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This study proposes and demonstrates a protocol for high-fidelity indirect readout of trapped ion hyperfine qubits. By mapping the state of one ion to a readout ion using laser-driven Raman transitions, the protocol reduces errors and allows for repetition to improve readout fidelity.
We propose and demonstrate a protocol for high-fidelity indirect readout of trapped ion hyperfine qubits, where the state of a Be-9(+) qubit ion is mapped to a Mg-25(+) readout ion using laser-driven Raman transitions. By partitioning the Be-9(+) ground-state hyperfine manifold into two subspaces representing the two qubit states and choosing appropriate laser parameters, the protocol can be made robust to spontaneous photon scattering errors on the Raman transitions, enabling repetition for increased readout fidelity. We demonstrate combined readout and back-action errors for the two subspaces of 1.2(-0.6)(+1.1) X 10-(4 ) and 0(-0)(+1.9) x 10(-5) with 68% confidence while avoiding decoherence of spectator qubits due to stray resonant light that is inherent to direct fluorescence detection.
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