Intrinsic decoherence and Rabi oscillation damping of Mn2+ and Co2+ electron spin qubits in bulk ZnO

K. Benzid; A. Chetoui; M. Maamache; P. Turek; J. Tribollet

doi:10.1209/0295-5075/104/47005

All issues

Volume 104 / No 4 (November 2013)

EPL, 104 4 (2013) 47005

Abstract

Issue		EPL Volume 104, Number 4, November 2013


Article Number		47005
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/104/47005
Published online		10 December 2013

EPL, 104 (2013) 47005

Intrinsic decoherence and Rabi oscillation damping of Mn²⁺ and Co²⁺ electron spin qubits in bulk ZnO

K. Benzid¹^,2^(a), A. Chetoui¹^,2^(b), M. Maamache²^(c), P. Turek¹^(d) and J. Tribollet¹^(e)

¹ Institut de Chimie (UMR 7177 CNRS - UDS), Université de Strasbourg 4 rue Blaise pascal, CS 90032, 67081 Strasbourg cedex, France
² Département de physique, Laboratoire de Physique Quantique et Systèmes Dynamiques, Université de Ferhat Abbas Sétif 1 - Sétif, Algérie

^(a) benzid@unistra.fr
^(b) chetoui@unistra.fr
^(c) maamache_m@yahoo.fr
^(d) turek@unistra.fr
^(e) tribollet@unistra.fr (corresponding author)

Received: 12 September 2013
Accepted: 8 November 2013

Abstract

We demonstrate by pulse EPR that two electron spin qubits in bulk ZnO, the Mn²⁺ and the Co²⁺ spin qubits, which have, respectively, long $(T_{2}(6\ \text{K})= 178\ \mu\text{s})$ and short $(T_{2}(1.7\ \text{K})= 9\ \mu\text{s})$ transverse spin coherence time T₂ at low temperature, have however very short and similar Rabi oscillation damping times, on the order of $T_{R}\approx250\ \text{ns}$ at low temperature. A detailed study of Mn²⁺ spin qubits has shown that the main contribution to the Rabi oscilation damping rate is temperature independent and proportional to the Rabi frequency. This main contribution to the damping rate during coherent microwave manipulation of spins is interpreted as due to the changes of the dipolar couplings induced by the long microwave pulse used in this kind of EPR nutation experiment. Strategies are suggested for overcoming this problem of Rabi oscillation overdamping in future spin-based quantum computers.

PACS: 76.30.-v – Electron paramagnetic resonance and relaxation / 03.67.Lx – Quantum computation architectures and implementations / 76.30.Fc – Iron group (3

© EPLA, 2013

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