Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences
Abstract
Here, we study spatial noise correlations in a Si/SiGe two-qubit device with integrated micromagnets. Our method relies on the concept of decoherence-free subspaces, whereby we measure the coherence time for two different Bell states, designed to be sensitive only to either correlated or anticorrelated noise, respectively. From these measurements we find weak correlations in low-frequency noise acting on the two qubits, while no correlations could be detected in high-frequency noise. We expect nuclear spin noise to have an uncorrelated nature. A theoretical model and numerical simulations give further insight into the additive effect of multiple independent (anti)correlated noise sources with an asymmetric effect on the two qubits as can result from charge noise. Such a scenario in combination with nuclear spins is plausible given the data and the known decoherence mechanisms. This work is highly relevant for the design of optimized quantum error correction codes for spin qubits in quantum dot arrays, as well as for optimizing the design of future quantum dot arrays.
- Authors:
-
- Delft Univ. of Technology (Netherlands)
- Univ. of Wisconsin, Madison, WI (United States)
- Delft Univ. of Technology (Netherlands); Intel Corporation, Hillsboro, OR (United States)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); US Army Research Office (ARO)
- OSTI Identifier:
- 1800109
- Grant/Contract Number:
- FG02-03ER46028; W911NF-17-1-0274
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 23; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics
Citation Formats
Boter, Jelmer M., Xue, Xiao, Krähenmann, Tobias, Watson, Thomas F., Premakumar, Vickram N., Ward, Daniel R., Savage, Donald E., Lagally, Max G., Friesen, Mark, Coppersmith, Susan N., Eriksson, Mark A., Joynt, Robert, and Vandersypen, Lieven M. K. Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences. United States: N. p., 2020.
Web. doi:10.1103/physrevb.101.235133.
Boter, Jelmer M., Xue, Xiao, Krähenmann, Tobias, Watson, Thomas F., Premakumar, Vickram N., Ward, Daniel R., Savage, Donald E., Lagally, Max G., Friesen, Mark, Coppersmith, Susan N., Eriksson, Mark A., Joynt, Robert, & Vandersypen, Lieven M. K. Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences. United States. https://doi.org/10.1103/physrevb.101.235133
Boter, Jelmer M., Xue, Xiao, Krähenmann, Tobias, Watson, Thomas F., Premakumar, Vickram N., Ward, Daniel R., Savage, Donald E., Lagally, Max G., Friesen, Mark, Coppersmith, Susan N., Eriksson, Mark A., Joynt, Robert, and Vandersypen, Lieven M. K. Thu .
"Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences". United States. https://doi.org/10.1103/physrevb.101.235133. https://www.osti.gov/servlets/purl/1800109.
@article{osti_1800109,
title = {Spatial noise correlations in a Si/SiGe two-qubit device from Bell state coherences},
author = {Boter, Jelmer M. and Xue, Xiao and Krähenmann, Tobias and Watson, Thomas F. and Premakumar, Vickram N. and Ward, Daniel R. and Savage, Donald E. and Lagally, Max G. and Friesen, Mark and Coppersmith, Susan N. and Eriksson, Mark A. and Joynt, Robert and Vandersypen, Lieven M. K.},
abstractNote = {Here, we study spatial noise correlations in a Si/SiGe two-qubit device with integrated micromagnets. Our method relies on the concept of decoherence-free subspaces, whereby we measure the coherence time for two different Bell states, designed to be sensitive only to either correlated or anticorrelated noise, respectively. From these measurements we find weak correlations in low-frequency noise acting on the two qubits, while no correlations could be detected in high-frequency noise. We expect nuclear spin noise to have an uncorrelated nature. A theoretical model and numerical simulations give further insight into the additive effect of multiple independent (anti)correlated noise sources with an asymmetric effect on the two qubits as can result from charge noise. Such a scenario in combination with nuclear spins is plausible given the data and the known decoherence mechanisms. This work is highly relevant for the design of optimized quantum error correction codes for spin qubits in quantum dot arrays, as well as for optimizing the design of future quantum dot arrays.},
doi = {10.1103/physrevb.101.235133},
journal = {Physical Review B},
number = 23,
volume = 101,
place = {United States},
year = {Thu Jun 11 00:00:00 EDT 2020},
month = {Thu Jun 11 00:00:00 EDT 2020}
}
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