%0 Journal Article
%A Hiltunen, Tuukka
%A Bluhm, Hendrik
%A Mehl, Sebastian
%A Harju, Ari
%T Charge-noise tolerant exchange gates of singlet-triplet qubits in asymmetric double quantum dots
%J Physical review / B
%V 91
%N 7
%@ 1098-0121
%C College Park, Md.
%I APS
%M FZJ-2015-01362
%P 075301
%D 2015
%X In the semiconductor double quantum dot singlet-triplet qubit architecture, the decoherence caused by the qubit's charge environment poses a serious obstacle towards large scale quantum computing. The effects of the charge decoherence can be mitigated by operating the qubit in the so-called sweet spot regions where it is insensitive to electrical noise. In this paper, we propose singlet-triplet qubits based on two quantum dots of different sizes. Such asymmetric double quantum dot systems allow the implementation of exchange gates with controllable exchange splitting J operated in the doubly occupied charge region of the larger dot, where the qubit has high resilience to charge noise. In the larger dot, J can be quenched to a value smaller than the intradot tunneling using magnetic fields, while the smaller dot and its larger splitting can be used in the projective readout of the qubit.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000348873800002
%R 10.1103/PhysRevB.91.075301
%U https://juser.fz-juelich.de/record/187784