Intrinsic decoherence and Rabi oscillation damping of Mn2+ and Co2+ electron spin qubits in bulk ZnO
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
Received: 12 September 2013
Accepted: 8 November 2013
We demonstrate by pulse EPR that two electron spin qubits in bulk ZnO, the Mn2+ and the Co2+ spin qubits, which have, respectively, long and short transverse spin coherence time T2 at low temperature, have however very short and similar Rabi oscillation damping times, on the order of 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