Cubic phase gates are not suitable for non-Clifford operations on GKP states
Cubic phase gates are not suitable for non-Clifford operations on GKP states
复制标题
立方相门不适用于 GKP 状态上的非 Clifford 操作
DOI:
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复制
发表时间:
2020
期刊:
影响因子:
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通讯作者:
U. Andersen
中科院分区:
文献类型:
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作者:
Jacob Hastrup;M. V. Larsen;Jonas S Neergaard;N. Menicucci;U. Andersen
With the Gottesman-Kitaev-Preskill (GKP) encoding, Clifford gates and error correction can be carried out using simple Gaussian operations. Still, non-Clifford gates, required for universality, require non-Gaussian elements. In their original proposal, GKP suggested a particularly simple method of using a single application of the cubic phase gate to perform the logical non-Clifford T-gate. Here we show that this cubic phase gate approach performs extraordinarily poorly, even for arbitrarily large amounts of squeezing in the GKP state. Thus, contrary to common belief, the cubic phase gate is not suitable for achieving universal fault-tolerant quantum computation with GKP states.
DOI:
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发表时间:
2020-06
期刊:
arXiv: Quantum Physics
影响因子:
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作者:
H. Yamasaki;Kosuke Fukui;Yuki Takeuchi;S. Tani;M. Koashi
通讯作者:
H. Yamasaki;Kosuke Fukui;Yuki Takeuchi;S. Tani;M. Koashi