High-fidelity readout of trapped-ion qubits

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% fidelit...

وصف كامل

التفاصيل البيبلوغرافية
المؤلفون الرئيسيون:	Myerson, A, Szwer, D, Webster, S, Allcock, D, Curtis, M, Imreh, G, Sherman, J, Stacey, D, Steane, A, Lucas, D
التنسيق:	Journal article
اللغة:	English
منشور في:	American Physical Society 2008
الموضوعات:	Physics Atomic and laser physics

الوصف
الملخص:	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 μs 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 μs. We achieve 99.87(4)% transfer fidelity and 99.77(3)% net readout fidelity.

High-fidelity readout of trapped-ion qubits

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