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% fideli...
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| Veröffentlicht in: | Physical review letters 2008-05, Vol.100 (20), p.200502-200502, Article 200502 |
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| container_title | Physical review letters |
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| creator | Myerson, A H Szwer, D J Webster, S C Allcock, D T C Curtis, M J Imreh, G Sherman, J A Stacey, D N Steane, A M Lucas, D M |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevLett.100.200502 |
| format | Article |
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| source | American Physical Society Journals |
| title | High-fidelity readout of trapped-ion qubits |
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