State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot

Ward, Daniel R.; Kim, Dohun; Savage, Donald E.; Lagally, Max G.; Foote, Ryan H.; Friesen, Mark; Coppersmith, Susan N.; Eriksson, Mark A.

doi:10.1038/npjqi.2016.32

State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot

Journal Article · Tue Oct 18 00:00:00 EDT 2016 · npj Quantum Information

DOI:https://doi.org/10.1038/npjqi.2016.32· OSTI ID:1340242

Ward, Daniel R. ^[1]; ^[2]; Savage, Donald E. ^[3]; Lagally, Max G. ^[3]; Foote, Ryan H. ^[4]; Friesen, Mark ^[4]; Coppersmith, Susan N. ^[4]; Eriksson, Mark A. ^[4]

Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
Univ. of Wisconsin, Madison, WI (United States). Dept. of Physics

Universal quantum computation requires high-fidelity single-qubit rotations and controlled two-qubit gates. Along with high-fidelity single-qubit gates, strong efforts have been made in developing robust two-qubit logic gates in electrically gated quantum dot systems to realise a compact and nanofabrication-compatible architecture. Here we perform measurements of state-conditional coherent oscillations of a charge qubit. Using a quadruple quantum dot formed in a Si/SiGe heterostructure, we show the first demonstration of coherent two-axis control of a double quantum dot charge qubit in undoped Si/SiGe, performing Larmor and Ramsey oscillation measurements. We extract the strength of the capacitive coupling between a pair of double quantum dots by measuring the detuning energy shift (≈75 μeV) of one double dot depending on the excess charge configuration of the other double dot. Finally, we further demonstrate that the strong capacitive coupling allows fast, state-conditional Landau–Zener–Stückelberg oscillations with a conditional π phase flip time of about 80 ps, showing a promising pathway towards multi-qubit entanglement and control in semiconductor quantum dots.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); Army Research Office (ARO) (United States); National Science Foundation (NSF) (United States); Dept. of the Navy (DON) (United States). Office of Naval Research (ONR); Dept. of Defense (DOD) (United States); Korea Inst. of Science and Technology (KIST) (Korea, Republic of)

Contributing Organization:: Seoul National Univ. (Korea, Republic of)

Grant/Contract Number:: AC04-94AL85000; FG02-03ER46028

OSTI ID:: 1340242

Report Number(s):: SAND2016--3914J; npjqi201632

Journal Information:: npj Quantum Information, Journal Name: npj Quantum Information Vol. 2; ISSN 2056-6387

Publisher:: Nature Partner JournalsCopyright Statement

Country of Publication:: United States

Language:: English

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