Journal Article

FZJ-2015-01362

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Charge-noise tolerant exchange gates of singlet-triplet qubits in asymmetric double quantum dots

Hiltunen, T. (Corresponding Author) ; Bluhm, H. ; Mehl, S.FZJ* ; Harju, A.

2015
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10801  doi:10.1103/PhysRevB.91.075301

Abstract: 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.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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