dorsal/arxiv
View SchemaSingle-bit Feedback and Quantum Dynamical Decoupling
| Authors | Francesco Ticozzi, Lorenza Viola |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0609165 |
| URL | https://arxiv.org/abs/quant-ph/0609165 |
| DOI | 10.1103/PhysRevA.74.052328 |
| Journal | Physical Review A 74, 052328, 2006 |
Abstract
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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"abstract": "Synthesizing an effective identity evolution in a target system subjected to\nunwanted unitary or non-unitary dynamics is a fundamental task for both quantum\ncontrol and quantum information processing applications. Here, we investigate\nhow single-bit, discrete-time feedback capabilities may be exploited to enact\nor to enhance quantum procedures for effectively suppressing unwanted dynamics\nin a finite-dimensional open quantum system. An explicit characterization of\nthe joint unitary propagators correctable by a single-bit feedback strategy for\narbitrary evolution time is obtained. For a two-dimensional target system, we\nshow how by appropriately combining quantum feedback with dynamical decoupling\nmethods, concatenated feedback-decoupling schemes may be built, which can\noperate under relaxed control assumptions and can outperform purely closed-loop\nand open-loop protocols.",
"arxiv_id": "quant-ph/0609165",
"authors": [
"Francesco Ticozzi",
"Lorenza Viola"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.74.052328",
"journal_ref": "Physical Review A 74, 052328, 2006",
"title": "Single-bit Feedback and Quantum Dynamical Decoupling",
"url": "https://arxiv.org/abs/quant-ph/0609165"
},
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