A fast quantum interface between different spin qubit encodings - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Nature Communications Année : 2018

A fast quantum interface between different spin qubit encodings

Résumé

Single-spin qubits in semiconductor quantum dots hold promise for universal quantum computation with demonstrations of a high single-qubit gate fidelity above 99.9% and two-qubit gates in conjunction with a long coherence time. However, initialization and readout of a qubit is orders of magnitude slower than control, which is detrimental for implementing measurement-based protocols such as error-correcting codes. In contrast, a singlet-triplet qubit, encoded in a two-spin subspace, has the virtue of fast readout with high fidelity. Here, we present a hybrid system which benefits from the different advantages of these two distinct spin-qubit implementations. A quantum interface between the two codes is realized by electrically tunable inter-qubit exchange coupling. We demonstrate a controlled-phase gate that acts within 5.5 ns, much faster than the measured dephasing time of 211 ns. The presented hybrid architecture will be useful to settle remaining key problems with building scalable spin-based quantum computers.
Fichier principal
Vignette du fichier
s41467-018-07522-1.pdf (1.48 Mo) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-01950800 , version 1 (11-12-2018)

Identifiants

Citer

A. Noiri, T. Nakajima, J. Yoneda, M. R. Delbecq, P. Stano, et al.. A fast quantum interface between different spin qubit encodings. Nature Communications, 2018, 9 (1), pp.5066. ⟨10.1038/s41467-018-07522-1⟩. ⟨hal-01950800⟩
52 Consultations
75 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More