High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit

2014/03/31 by T. P. Harty, D. T. C. Allcock, C. J. Ballance +5 · 1 citation
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1103/physrevlett.113.220501

published as Phys. Rev. Lett. 113, 220501 (2014) · Supplementary Information included. 6 nines, 7 figures, 8 pages

arxiv created 2014/10/07 · arxiv updated 2014/12/03

Abstract

We implement all single-qubit operations with fidelities significantly above the minimum threshold required for fault-tolerant quantum computing, using a trapped-ion qubit stored in hyperfine "atomic clock" states of ⁴³Ca⁺. We measure a combined qubit state preparation and single-shot readout fidelity of 99.93%, a memory coherence time of T^*₂=50 seconds, and an average single-qubit gate fidelity of 99.9999%. These results are achieved in a room-temperature microfabricated surface trap, without the use of magnetic field shielding or dynamic decoupling techniques to overcome technical noise.

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