Single ion qubit with estimated coherence time exceeding one hour

Pengfei Wang (), Chun-Yang Luan, Mu Qiao, Mark Um, Junhua Zhang, Ye Wang, Xiao Yuan, Mile Gu, Jingning Zhang and Kihwan Kim ()
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Pengfei Wang: Tsinghua University
Chun-Yang Luan: Tsinghua University
Mu Qiao: Tsinghua University
Mark Um: Tsinghua University
Junhua Zhang: Tsinghua University
Ye Wang: Tsinghua University
Xiao Yuan: Stanford University
Mile Gu: National University of Singapore
Jingning Zhang: Beijing Academy of Quantum Information Sciences
Kihwan Kim: Tsinghua University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Realizing a long coherence time quantum memory is a major challenge of current quantum technology. Until now, the longest coherence-time of a single qubit was reported as 660 s in a single 171Yb+ ion-qubit through the technical developments of sympathetic cooling and dynamical decoupling pulses, which addressed heating-induced detection inefficiency and magnetic field fluctuations. However, it was not clear what prohibited further enhancement. Here, we identify and suppress the limiting factors, which are the remaining magnetic-field fluctuations, frequency instability and leakage of the microwave reference-oscillator. Then, we observe the coherence time of around 5500 s for the 171Yb+ ion-qubit, which is the time constant of the exponential decay fit from the measurements up to 960 s. We also systematically study the decoherence process of the quantum memory by using quantum process tomography and analyze the results by applying recently developed resource theories of quantum memory and coherence. Our experimental demonstration will accelerate practical applications of quantum memories for various quantum information processing, especially in the noisy-intermediate-scale quantum regime.

Date: 2021
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DOI: 10.1038/s41467-020-20330-w

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