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000187784 1001_ $$0P:(DE-HGF)0$$aHiltunen, Tuukka$$b0$$eCorresponding Author
000187784 245__ $$aCharge-noise tolerant exchange gates of singlet-triplet qubits in asymmetric double quantum dots
000187784 260__ $$aCollege Park, Md.$$bAPS$$c2015
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000187784 520__ $$aIn the semiconductor double quantum dot singlet-triplet qubit architecture, the decoherence caused by the qubit's charge environment poses a serious obstacle towards large scale quantum computing. The effects of the charge decoherence can be mitigated by operating the qubit in the so-called sweet spot regions where it is insensitive to electrical noise. In this paper, we propose singlet-triplet qubits based on two quantum dots of different sizes. Such asymmetric double quantum dot systems allow the implementation of exchange gates with controllable exchange splitting J operated in the doubly occupied charge region of the larger dot, where the qubit has high resilience to charge noise. In the larger dot, J can be quenched to a value smaller than the intradot tunneling using magnetic fields, while the smaller dot and its larger splitting can be used in the projective readout of the qubit.
000187784 536__ $$0G:(DE-HGF)POF3-144$$a144 - Controlling Collective States (POF3-144)$$cPOF3-144$$fPOF III$$x0
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000187784 7001_ $$0P:(DE-HGF)0$$aBluhm, Hendrik$$b1
000187784 7001_ $$0P:(DE-Juel1)145051$$aMehl, Sebastian$$b2$$ufzj
000187784 7001_ $$0P:(DE-HGF)0$$aHarju, Ari$$b3
000187784 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.91.075301$$bAmerican Physical Society (APS)$$d2015-02-03$$n7$$p075301$$tPhysical Review B$$v91$$x1098-0121$$y2015
000187784 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.91.075301$$gVol. 91, no. 7, p. 075301$$n7$$p075301$$tPhysical review / B$$v91$$x1098-0121$$y2015
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