Phys. Rev. B 75, 193306 (2007) [4 pages]Inversion recovery of single quantum-dot exciton based qubitReceived 13 February 2007; published 10 May 2007 We investigate the coherence decay of a single-exciton-based qubit with electrical readout. Pairs of laser pulses initialize the qubit state and then map the target basis onto the measurement basis, probing the decay of either the population inversion or electronic polarization components of the state vector. A comparison of coherence and population decay confirms that the exciton coherence is lifetime limited by fast voltage-tunable electron tunneling. Optimum coherence times are limited by a heavy-hole tunneling rate slow compared with the repetition rate of the laser. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.193306
DOI:
10.1103/PhysRevB.75.193306
PACS:
73.21.La, 03.67.Hk, 78.47.+p
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