dorsal/arxiv
View SchemaFault-Tolerant Quantum Dynamical Decoupling
| Authors | K. Khodjasteh, D. A. Lidar |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0408128 |
| URL | https://arxiv.org/abs/quant-ph/0408128 |
| DOI | 10.1103/PhysRevLett.95.180501 |
| Journal | Phys. Rev. Lett. 95, 180501 (2005) |
Abstract
Dynamical decoupling pulse sequences have been used to extend coherence times in quantum systems ever since the discovery of the spin-echo effect. Here we introduce a method of recursively concatenated dynamical decoupling pulses, designed to overcome both decoherence and operational errors. This is important for coherent control of quantum systems such as quantum computers. For bounded-strength, non-Markovian environments, such as for the spin-bath that arises in electron- and nuclear-spin based solid-state quantum computer proposals, we show that it is strictly advantageous to use concatenated, as opposed to standard periodic dynamical decoupling pulse sequences. Namely, the concatenated scheme is both fault-tolerant and super-polynomially more efficient, at equal cost. We derive a condition on the pulse noise level below which concatenated is guaranteed to reduce decoherence.
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"abstract": "Dynamical decoupling pulse sequences have been used to extend coherence times\nin quantum systems ever since the discovery of the spin-echo effect. Here we\nintroduce a method of recursively concatenated dynamical decoupling pulses,\ndesigned to overcome both decoherence and operational errors. This is important\nfor coherent control of quantum systems such as quantum computers. For\nbounded-strength, non-Markovian environments, such as for the spin-bath that\narises in electron- and nuclear-spin based solid-state quantum computer\nproposals, we show that it is strictly advantageous to use concatenated, as\nopposed to standard periodic dynamical decoupling pulse sequences. Namely, the\nconcatenated scheme is both fault-tolerant and super-polynomially more\nefficient, at equal cost. We derive a condition on the pulse noise level below\nwhich concatenated is guaranteed to reduce decoherence.",
"arxiv_id": "quant-ph/0408128",
"authors": [
"K. Khodjasteh",
"D. A. Lidar"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.95.180501",
"journal_ref": "Phys. Rev. Lett. 95, 180501 (2005)",
"title": "Fault-Tolerant Quantum Dynamical Decoupling",
"url": "https://arxiv.org/abs/quant-ph/0408128"
},
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