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@ARTICLE{Mehl:154402,
author = {Mehl, Sebastian and Bluhm, Hendrik and DiVincenzo, David},
title = {{T}wo-qubit couplings of singlet-triplet qubits mediated by
one quantum state},
journal = {Physical review / B},
volume = {90},
issn = {0163-1829},
address = {College Park, Md.},
publisher = {APS},
reportid = {FZJ-2014-03749},
pages = {045404},
year = {2014},
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.},
cin = {PGI-2},
ddc = {530},
cid = {I:(DE-Juel1)PGI-2-20110106},
pnm = {422 - Spin-based and quantum information (POF2-422)},
pid = {G:(DE-HGF)POF2-422},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000338738600014},
doi = {10.1103/PhysRevB.90.045404},
url = {https://juser.fz-juelich.de/record/154402},
}