State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot
Abstract
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 four coupled quantum dots formed in a layered silicon and silicon-germanium structure, we show the first demonstration of coherent two-axis control of a double quantum dot charge qubit in undoped silicon/silicon-germanium, performing two types of qubit measurements. We extract the strength of the capacitive coupling between a pair of double quantum dots by measuring the detuning energy shift of one double dot depending on the excess charge configuration of the other double dot. We further demonstrate that the strong capacitive coupling allows fast, state-conditional quantum oscillations with a conditional pi phase flip time of about 80 ps, showing a promising pathway towards multi-qubit entanglement and control in semiconductor quantum dots.
- Authors:
-
[2];
- 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
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); US Army Research Office (ARO); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOD; Korea Inst. of Science and Technology (KIST) (Korea, Republic of); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Org.:
- Seoul National Univ. (Korea, Republic of)
- OSTI Identifier:
- 1340242
- Alternate Identifier(s):
- OSTI ID: 1356176
- Report Number(s):
- SAND2016-3914J
Journal ID: ISSN 2056-6387; npjqi201632
- Grant/Contract Number:
- AC04-94AL85000; FG02-03ER46028; W911NF-12-0607; DMR-1206915; PHY-1104660; N00014-15-1-0029; 2E26681
- Resource Type:
- Accepted Manuscript
- Journal Name:
- npj Quantum Information
- Additional Journal Information:
- Journal Volume: 2; Journal ID: ISSN 2056-6387
- Publisher:
- Nature Partner Journals
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 97 MATHEMATICS AND COMPUTING; electronic and spintronic devices; quantum dots; quantum information; qubits; 77 NANOSCIENCE AND NANOTECHNOLOGY
Citation Formats
Ward, Daniel R., Kim, Dohun, Savage, Donald E., Lagally, Max G., Foote, Ryan H., Friesen, Mark, Coppersmith, Susan N., and Eriksson, Mark A. State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot. United States: N. p., 2016.
Web. doi:10.1038/npjqi.2016.32.
Ward, Daniel R., Kim, Dohun, Savage, Donald E., Lagally, Max G., Foote, Ryan H., Friesen, Mark, Coppersmith, Susan N., & Eriksson, Mark A. State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot. United States. https://doi.org/10.1038/npjqi.2016.32
Ward, Daniel R., Kim, Dohun, Savage, Donald E., Lagally, Max G., Foote, Ryan H., Friesen, Mark, Coppersmith, Susan N., and Eriksson, Mark A. Tue .
"State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot". United States. https://doi.org/10.1038/npjqi.2016.32. https://www.osti.gov/servlets/purl/1340242.
@article{osti_1340242,
title = {State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot},
author = {Ward, Daniel R. and Kim, Dohun and Savage, Donald E. and Lagally, Max G. and Foote, Ryan H. and Friesen, Mark and Coppersmith, Susan N. and Eriksson, Mark A.},
abstractNote = {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 four coupled quantum dots formed in a layered silicon and silicon-germanium structure, we show the first demonstration of coherent two-axis control of a double quantum dot charge qubit in undoped silicon/silicon-germanium, performing two types of qubit measurements. We extract the strength of the capacitive coupling between a pair of double quantum dots by measuring the detuning energy shift of one double dot depending on the excess charge configuration of the other double dot. We further demonstrate that the strong capacitive coupling allows fast, state-conditional quantum oscillations with a conditional pi phase flip time of about 80 ps, showing a promising pathway towards multi-qubit entanglement and control in semiconductor quantum dots.},
doi = {10.1038/npjqi.2016.32},
journal = {npj Quantum Information},
number = ,
volume = 2,
place = {United States},
year = {Tue Oct 18 00:00:00 EDT 2016},
month = {Tue Oct 18 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Measurements of Capacitive Coupling Within a Quadruple-Quantum-Dot Array
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