Single-bit Feedback and Quantum Dynamical Decoupling

Details Single-bit Feedback and Quantum Dynamical Decoupling Single-bit Feedback and Quantum Dynamical Decoupling

2006-09-21

arxiv.org/abs/quant-ph/0609165v1

Physical Review A 74, 052328, 2006

Physics

Quantum Physics

12 pages, 2 figures

Scientific paper

10.1103/PhysRevA.74.052328

Synthesizing an effective identity evolution in a target system subjected to unwanted unitary or non-unitary dynamics is a fundamental task for both quantum control and quantum information processing applications. Here, we investigate how single-bit, discrete-time feedback capabilities may be exploited to enact or to enhance quantum procedures for effectively suppressing unwanted dynamics in a finite-dimensional open quantum system. An explicit characterization of the joint unitary propagators correctable by a single-bit feedback strategy for arbitrary evolution time is obtained. For a two-dimensional target system, we show how by appropriately combining quantum feedback with dynamical decoupling methods, concatenated feedback-decoupling schemes may be built, which can operate under relaxed control assumptions and can outperform purely closed-loop and open-loop protocols.

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