dorsal/arxiv
View SchemaPulse Control of Decoherence with Population Decay
| Authors | Takahiro Murakami, Yositake Takane |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0508080 |
| URL | https://arxiv.org/abs/quant-ph/0508080 |
| DOI | 10.1143/JPSJ.75.024006 |
Abstract
The pulse control of decoherence in a qubit interacting with a quantum environment is studied with focus on a general case where decoherence is induced by both pure dephasing and population decay. To observe how the decoherence is suppressed by periodic pi pulses, we present a simple method to calculate the time evolution of a qubit under arbitrary pulse sequences consisting of bit-flips and/or phase-flips. We examine the effectiveness of the two typical sequences: bb sequence consisting of only bit-flips, and bp sequence consisting of both bit- and phase-flips. It is shown that the effectiveness of the pulse sequences depends on a relative strength of the two decoherence processes especially when a pulse interval is slightly shorter than qubit-environment correlation times. In the short-interval limit, however, the bp sequence is always more effective than, or at least as effective as, the bb sequence.
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"abstract": "The pulse control of decoherence in a qubit interacting with a quantum\nenvironment is studied with focus on a general case where decoherence is\ninduced by both pure dephasing and population decay. To observe how the\ndecoherence is suppressed by periodic pi pulses, we present a simple method to\ncalculate the time evolution of a qubit under arbitrary pulse sequences\nconsisting of bit-flips and/or phase-flips. We examine the effectiveness of the\ntwo typical sequences: bb sequence consisting of only bit-flips, and bp\nsequence consisting of both bit- and phase-flips. It is shown that the\neffectiveness of the pulse sequences depends on a relative strength of the two\ndecoherence processes especially when a pulse interval is slightly shorter than\nqubit-environment correlation times. In the short-interval limit, however, the\nbp sequence is always more effective than, or at least as effective as, the bb\nsequence.",
"arxiv_id": "quant-ph/0508080",
"authors": [
"Takahiro Murakami",
"Yositake Takane"
],
"categories": [
"quant-ph"
],
"doi": "10.1143/JPSJ.75.024006",
"title": "Pulse Control of Decoherence with Population Decay",
"url": "https://arxiv.org/abs/quant-ph/0508080"
},
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