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arXiv:1708.03530quant-ph

Quantum CNOT Gate for Spins in Silicon

D. M. Zajac, A. J. Sigillito, M. Russ, F. Borjans, J. M. Taylor, G. Burkard, J. R. Petta

Abstract

Single qubit rotations and two-qubit CNOT operations are crucial ingredients for universal quantum computing. While high fidelity single qubit operations have been achieved using the electron spin degree of freedom, realizing a robust CNOT gate has been a major challenge due to rapid nuclear spin dephasing and charge noise. We demonstrate an efficient resonantly-driven CNOT gate for electron spins in silicon. Our platform achieves single-qubit rotations with fidelities >99%, as verified by randomized benchmarking. Gate control of the exchange coupling allows a quantum CNOT gate to be implemented with resonant driving in ~200 ns. We use the CNOT gate to generate a Bell state with 75% fidelity, limited by quantum state readout. Our quantum dot device architecture opens the door to multi-qubit algorithms in silicon.

arXiv comments
Journal reference
Science 359, 439 (2018)
DOI
doi:10.1126/science.aao5965
Subjects
quant-phQuantum Physics cond-mat.mes-hallMesoscale and Nanoscale Physics

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  1. Design of a silicon quantum computer chip 1 comment

    • There has been some slow but noticeable progress in building quantum computers using semiconductors. Researchers at Princeton were recently able to implement a two-qubit quantum gate in silicon [0]. [0]: https://arxiv.org/pdf/1708.03530.pdf

      vtomoleView on HNParent context

  2. New silicon structure opens the gate to quantum computers 1 comment

    • Thank you so much, I wasn't aware that the pre-print was on Arxiv. PS the web abstract link (as opposed to the pdf link above) is https://arxiv.org/abs/1708.03530

      mastaziView on HNParent context

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