Stabilizing qubit coherence via tracking-control

Details Stabilizing qubit coherence via tracking-control Stabilizing qubit coherence via tracking-control

2004-10-06

arxiv.org/abs/quant-ph/0410048v1

Quant. Info. and Computation 5, 350 (2005)

Physics

Quantum Physics

11 pages (single column), incl. 3 figures. Submitted to special issue of Quantum Information & Computation, following the Conf

Scientific paper

We consider the problem of stabilizing the coherence of a single qubit subject to Markovian decoherence, via the application of a control Hamiltonian, without any additional resources. In this case neither quantum error correction/avoidance, nor dynamical decoupling applies. We show that using tracking-control, i.e., the conditioning of the control field on the state of the qubit, it is possible to maintain coherence for finite time durations, until the control field diverges.

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