Decoherence of highly mixed macroscopic quantum superpositions

Hyunseok Jeong, Jinhyoung Lee, Hyunchul Nha

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

It is known that a macroscopic quantum superposition (MQS), when it is exposed to an environment, decoheres at a rate scaling with the separation of its component states in phase space. This is more or less consistent with the well-known proposition that a more macroscopic quantum state is reduced more quickly to a classical state in general. Effects of initial mixedness, however, on the subsequent decoherence of MQSs have been less known. We study the evolution of a highly mixed MQS interacting with an environment and compare it with that of a pure MQS having the same size as the central distance between its component states. Although the decoherence develops more rapidly for the mixed MQS in short times, its rate can be significantly suppressed after a certain time and becomes smaller than the decoherence rate of its corresponding pure MQS. In an optics experiment to generate a MQS, our result has the practical implication that nonclassicality of a MQS can still be observable in moderate times, even though a large amount of noise is added to the initial state.

Original languageEnglish
Pages (from-to)1025-1030
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume25
Issue number6
DOIs
Publication statusPublished - 2008

Fingerprint

optics
scaling

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Decoherence of highly mixed macroscopic quantum superpositions. / Jeong, Hyunseok; Lee, Jinhyoung; Nha, Hyunchul.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 25, No. 6, 2008, p. 1025-1030.

Research output: Contribution to journalArticle

@article{e0136c2e24274869bc0ecf7a79eaedbd,
title = "Decoherence of highly mixed macroscopic quantum superpositions",
abstract = "It is known that a macroscopic quantum superposition (MQS), when it is exposed to an environment, decoheres at a rate scaling with the separation of its component states in phase space. This is more or less consistent with the well-known proposition that a more macroscopic quantum state is reduced more quickly to a classical state in general. Effects of initial mixedness, however, on the subsequent decoherence of MQSs have been less known. We study the evolution of a highly mixed MQS interacting with an environment and compare it with that of a pure MQS having the same size as the central distance between its component states. Although the decoherence develops more rapidly for the mixed MQS in short times, its rate can be significantly suppressed after a certain time and becomes smaller than the decoherence rate of its corresponding pure MQS. In an optics experiment to generate a MQS, our result has the practical implication that nonclassicality of a MQS can still be observable in moderate times, even though a large amount of noise is added to the initial state.",
author = "Hyunseok Jeong and Jinhyoung Lee and Hyunchul Nha",
year = "2008",
doi = "10.1364/JOSAB.25.001025",
language = "English",
volume = "25",
pages = "1025--1030",
journal = "Journal of the Optical Society of America B: Optical Physics",
issn = "0740-3224",
publisher = "The Optical Society",
number = "6",

}

TY - JOUR

T1 - Decoherence of highly mixed macroscopic quantum superpositions

AU - Jeong, Hyunseok

AU - Lee, Jinhyoung

AU - Nha, Hyunchul

PY - 2008

Y1 - 2008

N2 - It is known that a macroscopic quantum superposition (MQS), when it is exposed to an environment, decoheres at a rate scaling with the separation of its component states in phase space. This is more or less consistent with the well-known proposition that a more macroscopic quantum state is reduced more quickly to a classical state in general. Effects of initial mixedness, however, on the subsequent decoherence of MQSs have been less known. We study the evolution of a highly mixed MQS interacting with an environment and compare it with that of a pure MQS having the same size as the central distance between its component states. Although the decoherence develops more rapidly for the mixed MQS in short times, its rate can be significantly suppressed after a certain time and becomes smaller than the decoherence rate of its corresponding pure MQS. In an optics experiment to generate a MQS, our result has the practical implication that nonclassicality of a MQS can still be observable in moderate times, even though a large amount of noise is added to the initial state.

AB - It is known that a macroscopic quantum superposition (MQS), when it is exposed to an environment, decoheres at a rate scaling with the separation of its component states in phase space. This is more or less consistent with the well-known proposition that a more macroscopic quantum state is reduced more quickly to a classical state in general. Effects of initial mixedness, however, on the subsequent decoherence of MQSs have been less known. We study the evolution of a highly mixed MQS interacting with an environment and compare it with that of a pure MQS having the same size as the central distance between its component states. Although the decoherence develops more rapidly for the mixed MQS in short times, its rate can be significantly suppressed after a certain time and becomes smaller than the decoherence rate of its corresponding pure MQS. In an optics experiment to generate a MQS, our result has the practical implication that nonclassicality of a MQS can still be observable in moderate times, even though a large amount of noise is added to the initial state.

UR - http://www.scopus.com/inward/record.url?scp=50449088408&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=50449088408&partnerID=8YFLogxK

U2 - 10.1364/JOSAB.25.001025

DO - 10.1364/JOSAB.25.001025

M3 - Article

VL - 25

SP - 1025

EP - 1030

JO - Journal of the Optical Society of America B: Optical Physics

JF - Journal of the Optical Society of America B: Optical Physics

SN - 0740-3224

IS - 6

ER -