| DOI | Resolve DOI: https://doi.org/10.1103/PhysRevB.111.115403 |
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| Author | Search for: Allami, HassanORCID identifier: https://orcid.org/0000-0003-2859-7489; Search for: Miravet, DanielORCID identifier: https://orcid.org/0000-0002-2908-4645; Search for: Korkusinski, Marek1ORCID identifier: https://orcid.org/0000-0002-2238-336X; Search for: Hawrylak, Pawel |
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| Affiliation | - National Research Council of Canada. Security and Disruptive Technologies
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| Funder | Search for: National Research Council Canada |
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| Format | Text, Article |
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| Abstract | We present a theory of a two-qubit gate with macroscopic singlet-triplet (ST) qubits in synthetic spin-one chains in InAsP quantum dot nanowires. The macroscopic topologically protected singlet-triplet qubits are built with two spin-half Haldane quasiparticles. The Haldane quasiparticles are hosted by a synthetic spin-one chain realized in chains of InAsP quantum dots embedded in an InP nanowire, with four electrons each. The quantum dot nanowire is described by a Hubbard-Kanamori (HK) Hamiltonian derived from an interacting atomistic model. Using exact diagonalization and matrix product states tools, we demonstrate that the low-energy behavior of the HK Hamiltonian is effectively captured by an antiferromagnetic spin-one chain Hamiltonian. Next, we consider two macroscopic qubits and present a method for creating a tunable coupling between the two macroscopic qubits by inserting an intermediate control dot between the two chains. Finally, we propose and demonstrate two approaches for generating highly accurate two-ST qubit gates: (1) by controlling the length of each qubit and (2) by employing different background magnetic fields for the two qubits. |
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| Publication date | 2025-03-05 |
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| Publisher | American Physical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 9a8ab8c6-b5df-4c5d-8c98-4645cc02b94d |
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| Record created | 2025-07-08 |
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| Record modified | 2025-11-03 |
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