Quantum control and process tomography of a semiconductor quantum dot hybrid qubit
| Autor: | Teck Seng Koh, Mark A. Eriksson, Dohun Kim, D. R. Ward, John King Gamble, Susan Coppersmith, Christie Simmons, Jonathan Prance, Zhan Shi, Donald E. Savage, Mark Friesen, Max G. Lagally |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Flux qubit Multidisciplinary Charge qubit Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics FOS: Physical sciences Quantum Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Phase qubit Computer Science::Emerging Technologies Controlled NOT gate Quantum mechanics Qubit Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Superconducting quantum computing Trapped ion quantum computer Quantum teleportation |
| DOI: | 10.48550/arxiv.1401.4416 |
| Popis: | The similarities between gated quantum dots and the transistors in modern microelectronics - in fabrication methods, physical structure, and voltage scales for manipulation - have led to great interest in the development of quantum bits (qubits) in semiconductor quantum dots. While quantum dot spin qubits have demonstrated long coherence times, their manipulation is often slower than desired for important future applications, such as factoring. Further, scalability and manufacturability are enhanced when qubits are as simple as possible. Previous work has increased the speed of spin qubit rotations by making use of integrated micromagnets, dynamic pumping of nuclear spins, or the addition of a third quantum dot. Here we demonstrate a new qubit that offers both simplicity - it requires no special preparation and lives in a double quantum dot with no added complexity - and is very fast: we demonstrate full control on the Bloch sphere with $\pi$-rotation times less than 100 ps in two orthogonal directions. We report full process tomography, extracting high fidelities equal to or greater than 85% for X-rotations and 94% for Z-rotations. We discuss a path forward to fidelities better than the threshold for quantum error correction. Comment: 6 pages, excluding Appendix |
| Databáze: | OpenAIRE |
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