Ultrafast high-fidelity initialization of a quantum-dot spin qubit without magnetic fields
We demonstrate the initialization of a single quantum-dot hole spin with high fidelity (lower bound > 97%), on picosecond time scales, and without the need for magnetic fields. Using the initialization scheme based on rapid electric-field ionization of a resonantly excited exciton, this is achiev...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-12, Vol.90 (24), Article 241303 |
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| container_title | Physical review. B, Condensed matter and materials physics |
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| creator | Mar, Jonathan D. Baumberg, Jeremy J. Xu, Xiulai Irvine, Andrew C. Williams, David A. |
| description | We demonstrate the initialization of a single quantum-dot hole spin with high fidelity (lower bound > 97%), on picosecond time scales, and without the need for magnetic fields. Using the initialization scheme based on rapid electric-field ionization of a resonantly excited exciton, this is achieved by employing a self-assembled quantum dot with a low conduction-to-valence band offset ratio, allowing control of the relative electron and hole tunneling rates over three orders of magnitude. This large difference in tunneling rates could permit spin-storage efficiencies > 99.5% by fast-switching to a low electric-field condition. Our results may provide a practical route towards ultrafast high-fidelity initialization of individual quantum-dot hole spins for the implementation of quantum error correction in a scalable spin-based quantum computer. |
| doi_str_mv | 10.1103/PhysRevB.90.241303 |
| format | Article |
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| ispartof | Physical review. B, Condensed matter and materials physics, 2014-12, Vol.90 (24), Article 241303 |
| issn | 1098-0121 1550-235X |
| language | eng |
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| source | American Physical Society Journals |
| subjects | Condensed matter Excitation Ionization Magnetic fields Quantum computers Quantum dots Qubits (quantum computing) Tunneling |
| title | Ultrafast high-fidelity initialization of a quantum-dot spin qubit without magnetic fields |
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