High-Fidelity Preparation, Gates, Memory, and Readout of a Trapped-Ion Quantum Bit.

Journal article

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 ^{43}Ca^{+}. We measure a combined qubit state preparation and single-shot readout fidelity of 99.93%, a memory coherence time of T_{2}^{*}=50  sec, 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.

Authors: Harty, T; Allcock, D; Ballance, C; Guidoni, L; Janacek, H

• Publication status: Published
• Publisher: American Physical Society
• Journal: Physical Review Letters
• Volume: 113
• Issue: 22
• Pages: 220501
• Publication date: 2014-11-01
• DOI: 10.1103/PhysRevLett.113.220501
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: quant-ph