All-electrical control of hole singlet-triplet spin qubits at low-leakage points
All-electrical control of hole singlet-triplet spin qubits at low-leakage points
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低泄漏点空穴单重态-三重态自旋量子位的全电控制
DOI：
10.1103/physrevb.104.195421
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发表时间：
2021
影响因子：
3.7
通讯作者：
G. Burkard
中科院分区：
文献类型：
--
作者：
P. Mutter;G. Burkard
研究了在任意方向磁场作用下，自旋轨道相互作用对双量子点中重空穴的影响。丰富的物理出现的两个不同自旋的空穴状态不仅耦合的自旋轨道相互作用，但另外的网站依赖的各向异性$g$张量的效果。它表明，这些影响可能会抵消在这样一种方式，以取消耦合在一定的失谐和磁场的倾斜角。这个特性可以用在单重态-三重态量子比特中，以避免泄漏错误并实现电自旋轨道开关，这表明了任务定制双轴控制的可能性。此外，我们研究了在弱磁场下具有强自旋-轨道相互作用的系统。通过精确对角化主导汉密尔顿，我们发现可以选择磁场，使得量子位基态仅在实际系统参数的逻辑子空间内混合，从而减少泄漏误差并提供对量子位的可靠控制。
We study the effect of the spin-orbit interaction on heavy holes confined in a double quantum dot in the presence of a magnetic field of arbitrary direction. Rich physics arise as the two hole states of different spin are not only coupled by the spin-orbit interaction but additionally by the effect of site-dependent anisotropic $g$ tensors. It is demonstrated that these effects may counteract in such a way as to cancel the coupling at certain detunings and tilting angles of the magnetic field. This feature may be used in singlet-triplet qubits to avoid leakage errors and implement an electrical spin-orbit switch, suggesting the possibility of task-tailored two-axes control. Additionally, we investigate systems with a strong spin-orbit interaction at weak magnetic fields. By exact diagonalization of the dominant Hamiltonian we find that the magnetic field may be chosen such that the qubit ground state is mixed only within the logical subspace for realistic system parameters, hence reducing leakage errors and providing reliable control over the qubit.
影响因子：
4.2
作者：
Froning, F. N. M.;Rancic, M. J.;Braakman, F. R.
通讯作者：
Braakman, F. R.
影响因子：
8.6
作者：
Sigillito, A. J.;Jock, R. M.;Lyon, S. A.
通讯作者：
Lyon, S. A.
影响因子：
56.9
作者：
Petta, JR;Johnson, AC;Gossard, AC
通讯作者：
Gossard, AC