Journal Article

FZJ-2014-03749

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two-qubit couplings of singlet-triplet qubits mediated by one quantum state

Mehl, S. (Corresponding Author)FZJ* ; Bluhm, H. ; DiVincenzo, D.FZJ*

2014
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7829  doi:10.1103/PhysRevB.90.045404

Abstract: We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via onequantum state (QS). The QS can be provided by a quantum dot itself or by another confined system. Theorbital energies of the QS are tunable using an electric gate close to the QS, which changes the interactionsbetween the STQs independent of their single-qubit parameters. Short gating sequences exist for controlled NOT(CNOT) operations. We show that realistic quantum dot setups permit excellent entangling operations with gateinfidelities below 10−3, which is lower than the quantum error correction threshold of the surface code. Weconsider limitations from fabrication errors, hyperfine interactions, spin-orbit interactions, and charge noise inGaAs and Si heterostructures.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 422 - Spin-based and quantum information (POF2-422) (POF2-422)

Appears in the scientific report 2014

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Database coverage:
; ; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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