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Nature Nanotechnology 2 (2007) 39

Rare-earth solid-state qubits

Sylvain Bertaina 1, 2, Serge Gambarelli 3, Alexandra Tkachuk 4, Igor Kurkin 5, Boris Malkin 5, Anatole Stepanov 6, Bernard Barbara (  Auteur correspondant ) 1

(01/01/2007)

Quantum bits (qubits) are the basic building blocks of any quantum computer. Superconducting qubits have been created with a 'top-down' approach that integrates superconducting devices into macroscopic electrical circuits [1-3], whereas electron-spin qubits have been demonstrated in quantum dots [4-6]. The phase coherence time (Tau2) and the single qubit figure of merit (QM) of superconducting and electron-spin qubits are similar --- Tau2 ~ microseconds and QM ~10-1000 below 100mK --- and it should be possible to scale-up these systems, which is essential for the development of any useful quantum computer. Bottom-up approaches based on dilute ensembles of spins have achieved much larger values of tau2 (up to tens of ms) [7, 8], but these systems cannot be scaled up, although some proposals for qubits based on 2D nanostructures should be scalable [9-11]. Here we report that a new family of spin qubits based on rare-earth ions demonstrates values of Tau2 (~ 50microseconds) and QM (~1400) at 2.5 K, which suggests that rare-earth qubits may, in principle, be suitable for scalable quantum information processing at 4He temperatures.

1 :	Institut Néel (NEEL)
	CNRS : UPR2940 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
2 :	Ecole Nationale Polytechnique (ENSPG)
	INP
3 :	Laboratoire de Chimie Inorganique et Biologie (LCIB)
	CEA – Université Joseph Fourier - Grenoble I
4 :	S.I. Vavilov State Optical Institute
	S.I. Vavilov State Optical Institute
5 :	Kazan State University
	Kazan State University
6 :	Laboratoire matériaux et microélectronique de Provence (L2MP)
	CNRS : UMR6137 – Université Paul Cézanne - Aix-Marseille III – Université de Provence - Aix-Marseille I – Université Sud Toulon Var

Équipe de recherche : NanoSpin

Domaine

:

Physique/Matière Condensée/Autre

Mots Clés : quantum coherence – magnetism – spins – qubits – rare-earths

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Contributeur : Bernard Barbara <>

Soumis le : Mercredi 14 Mars 2007, 00:29:08

Dernière modification le : Dimanche 18 Mars 2007, 00:10:15