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Title: Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings

Abstract

A scaled quantum computer with donor spins in silicon would benefit from a viable semiconductor framework and a strong inherent decoupling of the qubits from the noisy environment. Coupling neighboring spins via the natural exchange interaction according to current designs requires gate control structures with extremely small length scales. In this work, we present a silicon architecture where bismuth donors with long coherence times are coupled to electrons that can shuttle between adjacent quantum dots, thus relaxing the pitch requirements and allowing space between donors for classical control devices. An adiabatic SWAP operation within each donor/dot pair solves the scalability issues intrinsic to exchange-based two-qubit gates, as it does not rely on subnanometer precision in donor placement and is robust against noise in the control fields. In conclusion, we use this SWAP together with well established global microwave Rabi pulses and parallel electron shuttling to construct a surface code that needs minimal, feasible local control.

Authors:
 [1];  [1];  [2];  [3];  [2]
  1. University of St. Andrews (United Kingdom). SUPA, School of Physics and Astronomy
  2. Princeton Univ., NJ (United States). Deptartment of Electrical Engineering
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Ion Beam Technology Group
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1379035
Alternate Identifier(s):
OSTI ID: 1235641
Grant/Contract Number:  
AC02-05CH11231; SC0002140
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 3; 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; 36 MATERIALS SCIENCE

Citation Formats

Pica, G., Lovett, B. W., Bhatt, R. N., Schenkel, T., and Lyon, S. A. Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.035306.
Pica, G., Lovett, B. W., Bhatt, R. N., Schenkel, T., & Lyon, S. A. Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings. United States. https://doi.org/10.1103/PhysRevB.93.035306
Pica, G., Lovett, B. W., Bhatt, R. N., Schenkel, T., and Lyon, S. A. Thu . "Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings". United States. https://doi.org/10.1103/PhysRevB.93.035306. https://www.osti.gov/servlets/purl/1379035.
@article{osti_1379035,
title = {Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings},
author = {Pica, G. and Lovett, B. W. and Bhatt, R. N. and Schenkel, T. and Lyon, S. A.},
abstractNote = {A scaled quantum computer with donor spins in silicon would benefit from a viable semiconductor framework and a strong inherent decoupling of the qubits from the noisy environment. Coupling neighboring spins via the natural exchange interaction according to current designs requires gate control structures with extremely small length scales. In this work, we present a silicon architecture where bismuth donors with long coherence times are coupled to electrons that can shuttle between adjacent quantum dots, thus relaxing the pitch requirements and allowing space between donors for classical control devices. An adiabatic SWAP operation within each donor/dot pair solves the scalability issues intrinsic to exchange-based two-qubit gates, as it does not rely on subnanometer precision in donor placement and is robust against noise in the control fields. In conclusion, we use this SWAP together with well established global microwave Rabi pulses and parallel electron shuttling to construct a surface code that needs minimal, feasible local control.},
doi = {10.1103/PhysRevB.93.035306},
journal = {Physical Review B},
number = 3,
volume = 93,
place = {United States},
year = {Thu Jan 14 00:00:00 EST 2016},
month = {Thu Jan 14 00:00:00 EST 2016}
}

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Cited by: 47 works
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