Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots
We propose two schemes to coherently transfer arbitrary quantum states of the two-electron singlet-triplet qubit across a chain of three quantum dots. The schemes are based on electrical control over the detuning energy of the quantum dots. The first is a pulse-gated scheme, requiring dc pulses and...
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sg-ntu-dr.10356-899702023-02-28T19:37:47Z Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots Feng, MengKe Kwong, Chang Jian Koh, Teck Seng Kwek, Leong Chuan School of Physical and Mathematical Sciences Coulomb Blockade Quantum Information With Solid State Qubits We propose two schemes to coherently transfer arbitrary quantum states of the two-electron singlet-triplet qubit across a chain of three quantum dots. The schemes are based on electrical control over the detuning energy of the quantum dots. The first is a pulse-gated scheme, requiring dc pulses and engineering of inter- and intradot Coulomb energies. The second scheme is based on the adiabatic theorem, requiring time-dependent control of the detuning energy through avoided crossings at a rate that the system remains in the ground state. We simulate the transfer fidelity using typical experimental parameters for silicon quantum dots. Our results give state transfer fidelities between 94.3%<F<99.5% at sub-ns gate times for the pulse-gated scheme and between 75.4%<F<99.0% at tens of ns for the adiabatic scheme. Taking into account dephasing from charge noise, we obtain state transfer fidelities between 94.0%<F<99.2% for the pulse-gated scheme and between 64.9%<F<93.6% for the adiabatic scheme. Published version 2018-10-25T04:07:39Z 2019-12-06T17:37:43Z 2018-10-25T04:07:39Z 2019-12-06T17:37:43Z 2018 Journal Article Feng, M., Kwong, C. J., Koh, T. S., & Kwek, L. C. (2018). Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots. Physical Review B, 97(24), 245428-. doi:10.1103/PhysRevB.97.245428 2469-9950 https://hdl.handle.net/10356/89970 http://hdl.handle.net/10220/46426 10.1103/PhysRevB.97.245428 en Physical Review B https://doi.org/10.21979/N9/BPZHGR © 2018 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevB.97.245428]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 10 p. application/pdf |
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Coulomb Blockade Quantum Information With Solid State Qubits Feng, MengKe Kwong, Chang Jian Koh, Teck Seng Kwek, Leong Chuan Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
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We propose two schemes to coherently transfer arbitrary quantum states of the two-electron singlet-triplet qubit across a chain of three quantum dots. The schemes are based on electrical control over the detuning energy of the quantum dots. The first is a pulse-gated scheme, requiring dc pulses and engineering of inter- and intradot Coulomb energies. The second scheme is based on the adiabatic theorem, requiring time-dependent control of the detuning energy through avoided crossings at a rate that the system remains in the ground state. We simulate the transfer fidelity using typical experimental parameters for silicon quantum dots. Our results give state transfer fidelities between 94.3%<F<99.5% at sub-ns gate times for the pulse-gated scheme and between 75.4%<F<99.0% at tens of ns for the adiabatic scheme. Taking into account dephasing from charge noise, we obtain state transfer fidelities between 94.0%<F<99.2% for the pulse-gated scheme and between 64.9%<F<93.6% for the adiabatic scheme. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Feng, MengKe Kwong, Chang Jian Koh, Teck Seng Kwek, Leong Chuan |
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Article |
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Feng, MengKe Kwong, Chang Jian Koh, Teck Seng Kwek, Leong Chuan |
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Feng, MengKe |
title |
Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
title_short |
Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
title_full |
Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
title_fullStr |
Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
title_full_unstemmed |
Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
title_sort |
coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots |
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2018 |
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https://hdl.handle.net/10356/89970 http://hdl.handle.net/10220/46426 https://doi.org/10.21979/N9/BPZHGR |
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