Motional Quantum Error Correction

Details Motional Quantum Error Correction Motional Quantum Error Correction

1998-11-04

arxiv.org/abs/quant-ph/9811011v2

Physics

Quantum Physics

24 Pages, RevTex, also see http://www.thphys.may.ie/jtwamley/jtwamley.html Submitted to PRA. (CHANGED to two-column style)

Scientific paper

We examine the dynamics of a qubit stored in the motional degrees of freedom of an ultra-cold ion in an ion trap which is subject to the decoherence effects of a finite-temperature bath. We discover an encoding of the qubit, in two of the motional modes of the ion, which is stable against the occurrence of either none or one quantum jump. For the case of a zero-temperature bath we describe how to transfer only the information concerning the occurrence of quantum jumps and their types to a measuring apparatus, without affecting the ion's motional state significantly. We then describe how to generate a unitary restoration of the qubit given the jump information, through Raman processes generated by a series of laser pulses.

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