Subdecoherent Information Encoding in a Quantum-Dot Array

Details Subdecoherent Information Encoding in a Quantum-Dot Array Subdecoherent Information Encoding in a Quantum-Dot Array

1998-08-21

arxiv.org/abs/quant-ph/9808036v2

Phys.Rev.B59:8170,1999

Physics

Quantum Physics

12 pages LaTeX, 5 postscript figures. Final version accepted by PRB

Scientific paper

10.1103/PhysRevB.59.8170

A potential implementation of quantum-information schemes in semiconductor nanostructures is studied. To this end, the formal theory of quantum encoding for avoiding errors is recalled and the existence of noiseless states for model systems is discussed. Based on this theoretical framework, we analyze the possibility of designing noiseless quantum codes in realistic semiconductor structures. In the specific implementation considered, information is encoded in the lowest energy sector of charge excitations of a linear array of quantum dots. The decoherence channel considered is electron-phonon coupling We show that besides the well-known phonon bottleneck, reducing single-qubit decoherence, suitable many-qubit initial preparation as well as register design may enhance the decoherence time by several orders of magnitude. This behaviour stems from the effective one-dimensional character of the phononic environment in the relevant region of physical parameters.

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