Volume 84, Number 2, October 2008
Article Number 20009
Number of page(s) 5
Section General
Published online 14 October 2008
EPL, 84 (2008) 20009
DOI: 10.1209/0295/0295-5075/84/20009

Ultra long spin coherence time for Fe3+ in ZnO: A new spin qubit

J. Tribollet, J. Behrends and K. Lips

Hahn-Meitner-Institut Berlin, Abt. Silizium-Photovoltaik - Kekuléstr. 5, 12489 Berlin, Germany, EU

received 1 August 2008; accepted in final form 8 September 2008; published October 2008
published online 14 October 2008

We show by means of two pulse electron spin echo experiments on Fe3+ transition metal ions in natural ZnO that their spins S = $\frac{5}{2} $ have a spin coherence time limited at T = 6 K first by instantaneous diffusion ($\approx$ 150 $\mu$s), then by nuclear spectral diffusion ($\approx$ 450 $\mu$s) and ultimately by spin-lattice processes ($\approx$ 1.4 ms). We predict a spin coherence time in the millisecond range for such a spin qubit in isotopically and chemically purified ZnO. The spin state of a single Fe3+ spin qubit could be readout by optical methods and it could be coherently manipulated using pulsed electron spin resonance (ESR) methods. A free carrier electrically gated between two nearby Fe3+ ions could efficiently couple two Fe3+ spin qubits. All those elements suggest the high potential of the Fe3+ spin qubits in ZnO for the implementation of a scalable ESR quantum computer.

03.67.Lx - Quantum computation architectures and implementations.
76.30.-v - Electron paramagnetic resonance and relaxation.
76.30.Fc - Iron group (3d) ions and impurities (Ti-Cu).

© EPLA 2008