High-fidelity readout of trapped-ion qubits.

High-fidelity readout of trapped-ion qubits.

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We demonstrate single-shot qubit readout with a fidelity sufficient for fault-tolerant quantum computation. For an optical qubit stored in 40Ca+ we achieve 99.991(1)% average readout fidelity in 10(6) trials, using time-resolved photon counting. An adaptive measurement technique allows 99.99% fideli...

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Bibliographic Details
Main Authors: Myerson, A, Szwer, D, Webster, S, Allcock, D, Curtis, M, Imreh, G, Sherman, J, Stacey, D, Steane, A, Lucas, D
Format: Journal article
Language:English
Published: 2008
Description
Summary:We demonstrate single-shot qubit readout with a fidelity sufficient for fault-tolerant quantum computation. For an optical qubit stored in 40Ca+ we achieve 99.991(1)% average readout fidelity in 10(6) trials, using time-resolved photon counting. An adaptive measurement technique allows 99.99% fidelity to be reached in 145 micros average detection time. For 43Ca+, we propose and implement an optical pumping scheme to transfer a long-lived hyperfine qubit to the optical qubit, capable of a theoretical fidelity of 99.95% in 10 micros. We achieve 99.87(4)% transfer fidelity and 99.77(3)% net readout fidelity.

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