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arXiv · 1706.05102

High-Fidelity, Single-Shot, Quantum-Logic-Assisted Readout in a Mixed-Species Ion Chain

Colin Bruzewicz·Robert McConnell·Jonathon Sedlacek·Jules Stuart·William Loh·Jeremy Sage·John Chiaverini
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Abstract

We use a co-trapped ion ($^{88}\mathrm{Sr}^{+}$) to sympathetically cool and measure the quantum state populations of a memory-qubit ion of a different atomic species ($^{40}\mathrm{Ca}^{+}$) in a cryogenic, surface-electrode ion trap. Due in part to the low motional heating rate demonstrated here, the state populations of the memory ion can be transferred to the auxiliary ion by using the shared motion as a quantum state bus and measured with an average accuracy of 96(1)%. This scheme can be used in quantum information processors to reduce photon-scattering-induced error in unmeasured memory qubits.

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Colin Bruzewicz, Robert McConnell, Jonathon Sedlacek, Jules Stuart, William Loh, Jeremy Sage, John Chiaverini. 2017-06-15. High-Fidelity, Single-Shot, Quantum-Logic-Assisted Readout in a Mixed-Species Ion Chain. https://arxiv.org/abs/1706.05102

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