Quantum dynamics driven by continuous laser fields under measurements: Towards measurement-assisted quantum dynamics control

Michihiko Sugawara

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We study quantum system dynamics driven by continuous laser fields under the measurement process. In order to take into account the system transition due to the measurement, we define the superoperator which eliminates the coherence relevant to the measured quantum states. We clarify that the dynamics of the measured states is frozen in the frequent measurement limit, while the space spanned by unmeasured states is isolated from the original system. We also derive the effective Liouvillian which governs incoherent population dynamics under the condition, in which measurements are frequently applied. We apply the formulation to two-level and Λ -type three-level systems and clarify how the quantum measurements hinder the coherent population dynamics driven by the continuous laser fields in practical examples. Analysis on the laser field amplitude dependency of the final distribution in the t→∞ limit suggests the possibility of the measurement-assisted quantum control.

Original languageEnglish
Article number204115
JournalJournal of Chemical Physics
Volume123
Issue number20
DOIs
Publication statusPublished - 2005

Fingerprint

dynamic control
Lasers
lasers
Population dynamics
Dynamical systems
formulations

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Quantum dynamics driven by continuous laser fields under measurements : Towards measurement-assisted quantum dynamics control. / Sugawara, Michihiko.

In: Journal of Chemical Physics, Vol. 123, No. 20, 204115, 2005.

Research output: Contribution to journalArticle

@article{008482f2e6f64372a367792c2d9ced7e,
title = "Quantum dynamics driven by continuous laser fields under measurements: Towards measurement-assisted quantum dynamics control",
abstract = "We study quantum system dynamics driven by continuous laser fields under the measurement process. In order to take into account the system transition due to the measurement, we define the superoperator which eliminates the coherence relevant to the measured quantum states. We clarify that the dynamics of the measured states is frozen in the frequent measurement limit, while the space spanned by unmeasured states is isolated from the original system. We also derive the effective Liouvillian which governs incoherent population dynamics under the condition, in which measurements are frequently applied. We apply the formulation to two-level and Λ -type three-level systems and clarify how the quantum measurements hinder the coherent population dynamics driven by the continuous laser fields in practical examples. Analysis on the laser field amplitude dependency of the final distribution in the t→∞ limit suggests the possibility of the measurement-assisted quantum control.",
author = "Michihiko Sugawara",
year = "2005",
doi = "10.1063/1.2132275",
language = "English",
volume = "123",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "20",

}

TY - JOUR

T1 - Quantum dynamics driven by continuous laser fields under measurements

T2 - Towards measurement-assisted quantum dynamics control

AU - Sugawara, Michihiko

PY - 2005

Y1 - 2005

N2 - We study quantum system dynamics driven by continuous laser fields under the measurement process. In order to take into account the system transition due to the measurement, we define the superoperator which eliminates the coherence relevant to the measured quantum states. We clarify that the dynamics of the measured states is frozen in the frequent measurement limit, while the space spanned by unmeasured states is isolated from the original system. We also derive the effective Liouvillian which governs incoherent population dynamics under the condition, in which measurements are frequently applied. We apply the formulation to two-level and Λ -type three-level systems and clarify how the quantum measurements hinder the coherent population dynamics driven by the continuous laser fields in practical examples. Analysis on the laser field amplitude dependency of the final distribution in the t→∞ limit suggests the possibility of the measurement-assisted quantum control.

AB - We study quantum system dynamics driven by continuous laser fields under the measurement process. In order to take into account the system transition due to the measurement, we define the superoperator which eliminates the coherence relevant to the measured quantum states. We clarify that the dynamics of the measured states is frozen in the frequent measurement limit, while the space spanned by unmeasured states is isolated from the original system. We also derive the effective Liouvillian which governs incoherent population dynamics under the condition, in which measurements are frequently applied. We apply the formulation to two-level and Λ -type three-level systems and clarify how the quantum measurements hinder the coherent population dynamics driven by the continuous laser fields in practical examples. Analysis on the laser field amplitude dependency of the final distribution in the t→∞ limit suggests the possibility of the measurement-assisted quantum control.

UR - http://www.scopus.com/inward/record.url?scp=28344435641&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28344435641&partnerID=8YFLogxK

U2 - 10.1063/1.2132275

DO - 10.1063/1.2132275

M3 - Article

AN - SCOPUS:28344435641

VL - 123

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 20

M1 - 204115

ER -