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Gate fidelity and coherence of an electron spin in an Si/SiGe quantum dot with micromagnet.


ABSTRACT: The gate fidelity and the coherence time of a quantum bit (qubit) are important benchmarks for quantum computation. We construct a qubit using a single electron spin in an Si/SiGe quantum dot and control it electrically via an artificial spin-orbit field from a micromagnet. We measure an average single-qubit gate fidelity of ∼99% using randomized benchmarking, which is consistent with dephasing from the slowly evolving nuclear spins in the substrate. The coherence time measured using dynamical decoupling extends up to ∼400 μs for 128 decoupling pulses, with no sign of saturation. We find evidence that the coherence time is limited by noise in the 10-kHz to 1-MHz range, possibly because charge noise affects the spin via the micromagnet gradient. This work shows that an electron spin in an Si/SiGe quantum dot is a good candidate for quantum information processing as well as for a quantum memory, even without isotopic purification.

SUBMITTER: Kawakami E 

PROVIDER: S-EPMC5081655 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Gate fidelity and coherence of an electron spin in an Si/SiGe quantum dot with micromagnet.

Kawakami Erika E   Jullien Thibaut T   Scarlino Pasquale P   Ward Daniel R DR   Savage Donald E DE   Lagally Max G MG   Dobrovitski Viatcheslav V VV   Friesen Mark M   Coppersmith Susan N SN   Eriksson Mark A MA   Vandersypen Lieven M K LM  

Proceedings of the National Academy of Sciences of the United States of America 20161003 42


The gate fidelity and the coherence time of a quantum bit (qubit) are important benchmarks for quantum computation. We construct a qubit using a single electron spin in an Si/SiGe quantum dot and control it electrically via an artificial spin-orbit field from a micromagnet. We measure an average single-qubit gate fidelity of ∼99% using randomized benchmarking, which is consistent with dephasing from the slowly evolving nuclear spins in the substrate. The coherence time measured using dynamical d  ...[more]

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