Resonant exchange operation in triple-quantum-dot qubits for spin-photon transduction

被引:13
|
作者
Pan, Andrew [1 ]
Keating, Tyler E. [1 ]
Gyure, Mark F. [1 ]
Pritchett, Emily J. [1 ,2 ]
Quinn, Samuel [1 ]
Ross, Richard S. [1 ]
Ladd, Thaddeus D. [1 ]
Kerckhoff, Joseph [1 ]
机构
[1] HRL Labs LLC, 3011 Malibu Canyon Rd, Malibu, CA 90265 USA
[2] IBM Thomas J Watson Res Ctr, 1101 Kitchawan Rd, Yorktown Hts, NY 10598 USA
来源
QUANTUM SCIENCE AND TECHNOLOGY | 2020年 / 5卷 / 03期
关键词
spin qubits; spin-photon coupling; resonant exchange; full configuration interaction (FCI); circuit QED; triple quantum dot; exchange-only; COMPUTATION;
D O I
10.1088/2058-9565/ab86c9
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Triple quantum dots (TQDs) are promising semiconductor spin qubits because of their all-electrical control via fast, tunable exchange interactions and immunity to global magnetic fluctuations. These qubits can experience strong transverse interaction with photons in the resonant exchange (RX) regime, when exchange is simultaneously active on both qubit axes. However, most theoretical work has been based on phenomenological Fermi-Hubbard models, which may not fully capture the complexity of the qubit spin-charge states in this regime. Here we investigate exchange in Si/SiGe and GaAs TQDs using full configuration interaction (FCI) calculations which better describe practical device operation. We show that high exchange operation in general, and the RX regime in particular, can differ significantly from simple models, presenting new challenges and opportunities for spin-photon coupling. We highlight the impact of device electrostatics and effective mass on exchange and identify a new operating point (XRX) where strong spin-photon coupling is most likely to occur in Si/SiGe TQDs. Based on our numerical results, we analyze the feasibility of a remote entanglement cavity iSWAP protocol and discuss design pathways for improving fidelity. Our analysis provides insight into the requirements for TQD spin-photon transduction and demonstrates more generally the necessity of accurate modeling of exchange in spin qubits.
引用
收藏
页数:16
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