Publications by Derek Stacey


High-fidelity readout of trapped-ion qubits

PHYS REV LETT AMER PHYSICAL SOC 100 (2008) 200502

AH Myerson, DJ Szwer, SC Webster, DTC Allcock, MJ Curtis, G Imreh, JA Sherman, DN Stacey, AM Steane, DM Lucas

We demonstrate single-shot qubit readout with a fidelity sufficient for fault-tolerant quantum computation. For an optical qubit stored in Ca-40(+) 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 mu s average detection time. For Ca-43(+), 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 mu s. We achieve 99.87(4)% transfer fidelity and 99.77(3)% net readout fidelity.


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