Details

Autor(en) / Beteiligte

• Wang, Ye
• Um, Mark
• Zhang, Junhua
• An, Shuoming
• Lyu, Ming
• Zhang, Jing-Ning
• Duan, L.-M.
• Yum, Dahyun
• Kim, Kihwan

Titel

Single-qubit quantum memory exceeding ten-minute coherence time

Ist Teil von

• Nature photonics, 2017-10, Vol.11 (10), p.646-650

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A long-time quantum memory capable of storing and measuring quantum information at the single-qubit level is an essential ingredient for practical quantum computation and communication1,2. Currently, the coherence time of a single qubit is limited to less than 1 min, as demonstrated in trapped ion systems3–5, although much longer coherence times have been reported in ensembles of trapped ions6,7 and nuclear spins of ionized donors8,9. Here, we report the observation of a coherence time of over 10 min for a single qubit in a 171Yb+ ion sympathetically cooled by a 138Ba+ ion in the same Paul trap, which eliminates the problem of qubit-detection inefficiency from heating of the qubit ion10,11. We also apply a few thousand dynamical decoupling pulses to suppress ambient noise from magnetic-field fluctuations and phase noise from the local oscillator8,9,12–16. The long-time quantum memory of the single trapped ion qubit would be the essential component of scalable quantum computers1,17,18, quantum networks2,19,20 and quantum money21,22.