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We report measurement of the ensemble averaged transverse spin relaxationtime (T2*) in bulk and few molecules of the organic semiconductortris(8-hydroxyquinolinolato aluminum) or Alq3. This system exhibits twocharacteristic T2* times, the longer of which is temperature-independent andthe shorter is temperature-dependent, indicating that the latter is most likelylimited by spin-phonon interaction. Based on the measured data, we infer thatthe single particle T2 time is long enough to meet Knill's criterion for faulttolerant quantum computing, even at room temperature. Alq3 is also an opticallyactive organic and we propose a simple optical scheme for spin qubit read out.Moreover, we found that the temperature-dependent T2* time is considerablyshorter in bulk Alq3 powder than in few molecules confined in 1-2 nm sizedcavities, which is suggestive of a new type of ``phonon bottleneck effect''.This is very intriguing for organic molecules where carriers are alwayslocalized over individual molecules but the phonons are delocalized.

Transverse spin relaxation time in organic molecules: A possible platform for fault tolerant room temperature quantum computing