High-fidelity initialization of long-lived quantum dot hole spin qubits by reduced fine-structure splitting
High-fidelity initialization of long-lived quantum dot hole spin qubits by reduced fine-structure splitting
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DOI：
10.1103/physrevb.92.121301
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发表时间：
2015-06
影响因子：
3.7
通讯作者：
A. Brash;L. Martins;Feng Liu;J. H. Quilter;A. Ramsay;M. S. Skolnick;A. M. Fox
中科院分区：
文献类型：
--
作者：
A. Brash;L. Martins;Feng Liu;J. H. Quilter;A. Ramsay;M. S. Skolnick;A. M. Fox
We demonstrate an on-demand hole spin qubit initialization scheme meeting four key requirements of quantum information processing: fast initialization (1/e \ensuremath{\sim} 100 ps), high fidelity ($Fg99%$), long qubit lifetime ($2{T}_{h}g{T}_{2}^{*}\ensuremath{\simeq}10\phantom{\rule{0.28em}{0ex}}\mathrm{ns}$), and compatibility with optical coherent control schemes. This is achieved by rapidly ionizing an exciton in an InGaAs quantum dot with very low fine-structure splitting at zero magnetic field. Furthermore, we show that the hole spin fidelity of an arbitrary quantum dot can be increased by optical Stark effect tuning of the fine-structure splitting close to zero.
We demonstrate an on-demand hole spin qubit initialization scheme meeting four key requirements of quantum information processing: fast initialization (1/e \ensuremath{\sim} 100 ps), high fidelity ($Fg99%$), long qubit lifetime ($2{T}_{h}g{T}_{2}^{*}\ensuremath{\simeq}10\phantom{\rule{0.28em}{0ex}}\mathrm{ns}$), and compatibility with optical coherent control schemes. This is achieved by rapidly ionizing an exciton in an InGaAs quantum dot with very low fine-structure splitting at zero magnetic field. Furthermore, we show that the hole spin fidelity of an arbitrary quantum dot can be increased by optical Stark effect tuning of the fine-structure splitting close to zero.