Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-07-21
Nature Physics 7, 223-229 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
24 pages, 5 figures
Scientific paper
10.1038/nphys1863
The interaction between two quantum bits enables entanglement, the two-particle correlations that are at the heart of quantum information science. In semiconductor quantum dots much work has focused on demonstrating single spin qubit control using optical techniques. However, optical control of entanglement of two spin qubits remains a major challenge for scaling from a single qubit to a full-fledged quantum information platform. Here, we combine advances in vertically-stacked quantum dots with ultrafast laser techniques to achieve optical control of the entangled state of two electron spins. Each electron is in a separate InAs quantum dot, and the spins interact through tunneling, where the tunneling rate determines how rapidly entangling operations can be performed. The two-qubit gate speeds achieved here are over an order of magnitude faster than in other systems. These results demonstrate the viability and advantages of optically controlled quantum dot spins for multi-qubit systems.
Bracker Allan
Carter Samuel G.
Gammon Daniel
Greilich Alex
Kim Danny
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