Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
| Autor: | Zhanning Wang, Sven Rogge, James H. Cullen, Alex R. Hamilton, Joe Salfi, Dimitrie Culcer, E. Marcellina |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Quantum decoherence
Computer Networks and Communications Dephasing QC1-999 FOS: Physical sciences 02 engineering and technology 01 natural sciences Quantum mechanics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Computer Science (miscellaneous) 010306 general physics Spin-½ Quantum computer Physics Condensed Matter - Mesoscale and Nanoscale Physics Relaxation (NMR) Statistical and Nonlinear Physics QA75.5-76.95 021001 nanoscience & nanotechnology Dipole Computational Theory and Mathematics Quantum dot Qubit Electronic computers. Computer science 0210 nano-technology |
| Zdroj: | npj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021) |
| Popis: | Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to establish to what extent spin-orbit coupling exposes qubits to electrical noise, facilitating decoherence. Here, taking Ge as an example, we show that group IV gate-defined hole spin qubits generically exhibit optimal operation points, defined by the top gate electric field, at which they are both fast and long-lived: the dephasing rate vanishes to first order in electric field noise along all directions in space, the electron dipole spin resonance strength is maximised, while relaxation is drastically reduced at small magnetic fields. The existence of optimal operation points is traced to group IV crystal symmetry and properties of the Rashba spin-orbit interaction unique to spin-3/2 systems. Our results overturn the conventional wisdom that fast operation implies reduced lifetimes, and suggest group IV hole spin qubits as ideal platforms for ultra-fast, highly coherent scalable quantum computing. 32 pages, 4 figures |
| Databáze: | OpenAIRE |
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