Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit

J. C. Abadillo-Uriel; Brandur Thorgrimsson; Dohun Kim; L. W. Smith; C. B. Simmons; Daniel R. Ward; Ryan H. Foote; J. Corrigan; D. E. Savage; M. G. Lagally; M. J. Calderón; S. N. Coppersmith; M. A. Eriksson; Mark Friesen

doi:10.1103/PhysRevB.98.165438

Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit

J. C. Abadillo-Uriel, Brandur Thorgrimsson, Dohun Kim, L. W. Smith, C. B. Simmons, Daniel R. Ward, Ryan H. Foote, J. Corrigan, D. E. Savage, M. G. Lagally, M. J. Calderón, S. N. Coppersmith, M. A. Eriksson, Mark Friesen

Department of Physics

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well interface. By employing tight-binding simulations, we identify potential disorder profiles that induce behavior consistent with the experiments. The results indicate that disorder can give rise to "sweet spots" where the decoherence caused by charge noise is suppressed, even in a parameter regime where true sweet spots are unexpected. Conversely, "hot spots" where the decoherence is enhanced can also occur. Our results suggest that interfacial atomic structure can be used in particular cases as a tool to enhance the fidelity of Si double-dot qubits.

Original language	English
Article number	165438
Journal	Physical Review B
Volume	98
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.98.165438
Publication status	Published - 2018 Oct 29

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.98.165438

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Abadillo-Uriel, J. C., Thorgrimsson, B., Kim, D., Smith, L. W., Simmons, C. B., Ward, D. R., Foote, R. H., Corrigan, J., Savage, D. E., Lagally, M. G., Calderón, M. J., Coppersmith, S. N., Eriksson, M. A., & Friesen, M. (2018). Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit. Physical Review B, 98(16), Article 165438. https://doi.org/10.1103/PhysRevB.98.165438

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title = "Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit",

abstract = "We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well interface. By employing tight-binding simulations, we identify potential disorder profiles that induce behavior consistent with the experiments. The results indicate that disorder can give rise to {"}sweet spots{"} where the decoherence caused by charge noise is suppressed, even in a parameter regime where true sweet spots are unexpected. Conversely, {"}hot spots{"} where the decoherence is enhanced can also occur. Our results suggest that interfacial atomic structure can be used in particular cases as a tool to enhance the fidelity of Si double-dot qubits.",

author = "Abadillo-Uriel, {J. C.} and Brandur Thorgrimsson and Dohun Kim and Smith, {L. W.} and Simmons, {C. B.} and Ward, {Daniel R.} and Foote, {Ryan H.} and J. Corrigan and Savage, {D. E.} and Lagally, {M. G.} and Calder{\'o}n, {M. J.} and Coppersmith, {S. N.} and Eriksson, {M. A.} and Mark Friesen",

note = "Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = oct,

day = "29",

doi = "10.1103/PhysRevB.98.165438",

language = "English",

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Abadillo-Uriel, JC, Thorgrimsson, B, Kim, D, Smith, LW, Simmons, CB, Ward, DR, Foote, RH, Corrigan, J, Savage, DE, Lagally, MG, Calderón, MJ, Coppersmith, SN, Eriksson, MA & Friesen, M 2018, 'Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit', Physical Review B, vol. 98, no. 16, 165438. https://doi.org/10.1103/PhysRevB.98.165438

TY - JOUR

T1 - Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit

AU - Abadillo-Uriel, J. C.

AU - Thorgrimsson, Brandur

AU - Kim, Dohun

AU - Smith, L. W.

AU - Simmons, C. B.

AU - Ward, Daniel R.

AU - Foote, Ryan H.

AU - Corrigan, J.

AU - Savage, D. E.

AU - Lagally, M. G.

AU - Calderón, M. J.

AU - Coppersmith, S. N.

AU - Eriksson, M. A.

AU - Friesen, Mark

PY - 2018/10/29

Y1 - 2018/10/29

N2 - We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well interface. By employing tight-binding simulations, we identify potential disorder profiles that induce behavior consistent with the experiments. The results indicate that disorder can give rise to "sweet spots" where the decoherence caused by charge noise is suppressed, even in a parameter regime where true sweet spots are unexpected. Conversely, "hot spots" where the decoherence is enhanced can also occur. Our results suggest that interfacial atomic structure can be used in particular cases as a tool to enhance the fidelity of Si double-dot qubits.

AB - We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well interface. By employing tight-binding simulations, we identify potential disorder profiles that induce behavior consistent with the experiments. The results indicate that disorder can give rise to "sweet spots" where the decoherence caused by charge noise is suppressed, even in a parameter regime where true sweet spots are unexpected. Conversely, "hot spots" where the decoherence is enhanced can also occur. Our results suggest that interfacial atomic structure can be used in particular cases as a tool to enhance the fidelity of Si double-dot qubits.

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Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit

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