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CPP: Chemische Physik und Polymerphysik

CPP 9: New Methods

CPP 9.4: Vortrag

Mittwoch, 4. April 2001, 16:45–17:05, 112

Electron Spin Quantum Computing With Endohedral Fullerenes — •Wolfang Harneit, M. Waiblinger, K. Lips, C. Meyer, and A. Weidinger — Hahn-Meitner-Institut Berlin

We propose to use the electron spin of N@C₆₀ as a new type of qubit for scalable solid state quantum computing.

Endohedrally trapped nitrogen in C₆₀ displays a spectacularly sharp S=3/2 electron paramagnetic resonance pattern in both the liquid and the solid state. N@C₆₀ has a long electron spin decoherence time of T₂>20 µs independent of temperature, allowing for sufficient time to manipulate spin information using conventional EPR pulses. Dipole-dipole coupling of adjacent endohedral fullerenes can be as large as 50 MHz, providing a convenient way to propagate spin information.

On the other hand, the accurate placement of fullerenes on a surface using an STM tip is already feasible. Moreover, chemical modifications of the fullerene cage do not affect the stability of the endohedral atom and allow for fine-tuning of the spin properties. This opens the route to chemically tailored arrangements of quasi-free electron spin chains useful for quantum computing.