Hyperfine-induced decoherence in triangular spin-cluster qubits

Filippo Troiani; Dimitrije Stepanenko; Daniel Loss

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Hyperfine-induced decoherence in triangular spin-cluster qubits

机译：三角自旋群量子位中的超精细诱导退相干

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摘要

We theoretically investigate hyperfine-induced decoherence in a triangular spin cluster for different qubit encodings. Electrically controllable eigenstates of spin chirality (C_z) show no appreciable decoherence up to 10~2 μs, while a complete decoherence is estimated for the eigenstates of the total-spin projection (S_z) and of the partial spin sum (S_(12)) after 10 μs. The robustness of chirality is due to its decoupling from both the total- and individual-spin components in the cluster. This results in a suppression of the effective interaction between C_z and the nuclear-spin bath. We finally estimate the reduction of the decoherence time scale for C_z, resulting from possible hyperfine contact terms or from the misalignment of the magnetic field.

机译：我们在理论上研究了三角旋转簇中针对不同qubit编码的超精细诱导的退相干。自旋手性的电可控本征态（C_z）直到10〜2μs都没有明显的退相干，而总自旋投影（S_z）和部分自旋和（S_（12））的本征态估计为完全退相干10μs后手性的鲁棒性归因于其与簇中全部自旋和单独自旋成分的解耦。这导致抑制了C_z和核自旋浴之间的有效相互作用。我们最终估计出C_z的退相干时间尺度的减小，这是由于可能的超精细接触项或磁场的未对准所致。

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来源
《Physical review》 |2012年第16期|161409.1-161409.5|共5页
作者
Filippo Troiani; Dimitrije Stepanenko; Daniel Loss;
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作者单位

S3, Istituto Nanoscienze-CNR, via G. Campi 213/A, 1-41100 Modena, Italy;

Department of Physics, University of Basel, Klingbergstrasse 82, CH-4056 Basel, Switzerland;

Department of Physics, University of Basel, Klingbergstrasse 82, CH-4056 Basel, Switzerland;

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正文语种 eng
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decoherence; open systems; quantum statistical methods; quantum computation; molecular magnets;

机译：退相干开放系统;量子统计方法;量子计算分子磁铁;

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Hyperfine-induced decoherence in triangular spin-cluster qubits

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