Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Quantum Electronics and Laser Science Conference

Entangled and disentangled evolution for a single atom in a driven cavity

Perry R. Rice, Julio R. Gea-Banacloche, Luis A. Orozco

Published Dec 10, 2005• 0 citations
Publisher

Abstract

For an atom in a driven cavity we find states that are highly entangled, and that spontaneous emission can transiently increase entanglement. We propose a correlation function measurement and discuss time evolution of entanglement.
DOI
10.1109/qels.2005.1549051

Related papers

Entangled and Disentangled Evolution for a Single Atom in a Driven Cavity

Julio R. Gea-Banacloche, T. C. Burt, Perry R. Rice +1 more

For an atom in an externally driven cavity, we show that special initial states lead to near-disentangled atom-field evolution, and superpositions of these can lead to near maximally entangled states. Somewhat counterintutively, we find that (moderate) spontaneous emission in this system actually leads to a transient increase in entanglement beyond the steady-state value. We also show that a particular field correlation function could be used, in an experimental setting, to track the time evolution of this entanglement.

arXiv:quant-ph/0409164•Physical Review Letters•Feb 10, 2005•30 citations

Entanglement and fluctuations in cavity quantum electrodynamics (Invited Paper)

Julio R. Gea-Banacloche, T. C. Burt, Perry R. Rice +1 more

We explore the entanglement between a single atom and a single, resonant field mode of a driven optical cavity, focusing on the strong driving regime. We show that, in the absence of spontaneous emission, there are special initial conditions that lead to approximately disentangled trajectories, whereas spontaneous emission results in coherent superpositions of such trajectories that may lead to (transient) near-maximally entangled atom-field states. We also discuss the possibility of using a special "asymmetric" field correlation function to track the time evolution of this entanglement.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 23, 2005•0 citations

Steady State Entanglement in Cavity QED

P. R. Rice, J. Gea-Banacloche, M. L. Terraciano +2 more

We investigate steady state entanglement in an open quantum system, specifically a single atom in a driven optical cavity with cavity loss and spontaneous emission. The system reaches a steady pure state when driven very weakly. Under these conditions, there is an optimal value for atom-field coupling to maximize entanglement, as larger coupling favors a loss port due to the cavity enhanced spontaneous emission. We address ways to implement measurements of the entanglement and find that normalized cross-correlation functions are indicators of the entanglement in the system. The equal time intensity-field cross correlation between the transmitted field of the cavity and the fluorescence intensity is proportional to the entanglement of formation for weak driving fields.

arXiv:quant-ph/0601208•Optics Express•Jan 1, 2006•22 citations

Time evolution of atom-field entanglement in a cavity QED system

Perry R. Rice, James Clemens, Nick Cummings

For an atom in a driven cavity we find that the atom-cavity entanglement is maximized for an intermediate driving field strength. We find that entanglement can be transiently enhanced by a measurement.

Conference on Lasers and Electro-Optics•Jan 1, 2006•0 citations

Entanglement measurement in a Cavity QED System

M. L. Terraciano, Rebecca Olson Knell, D. G. Norris +4 more

We measure an entanglement witness of a cavity QED system with the cross correlation of its orthogonal modes. The driven mode has information about the field, while the nondriven about the atom through spontaneous emission.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting•Jan 1, 2007•0 citations

Entangled anddisentangled evolution forasingle atomina driven cavity

Perry R. Rice, Julio R. Gea-Banacloche, Luis A. Orozco

Foranatominadriven cavity wefind states that arehighly entangled, andthat spontaneous emission cantransiently increase entanglement. Wepropose a correlation function measurement anddiscuss timeevolution ofentanglement. C2003Optical Society ofAmerica OCIScodes:270.5580 Quantum Electrodynamics, 270.5290 Photon Statistics Inarecent, beautiful experiment, Auffeves andcoworkers (1) haveverfied theprediction (2)that, fora two-level atominteracting with asingle modeoftheelectromagnetic field, inacoherent state with a moderately large number ofphotons, thenatural evolution ofthesystem leads toasuperposition state inwhich twodifferent states oftheatomarecorrelated with twodistinguishable states ofthefield, in whatisoften referred toasaSchrodinger cat.Suchsuperpositions ofcorrelated states, ifpure, are naturally entangled states. Interestingly, thepossibility ofpreparing suchentangled superpositions in theabove system (which isdescribed bytheso-called Jaynes-Cummings model, orJCM)arises from theexistence, inthis model, ofspecial trajectories along whichthejoint evolution offield andatomis toagoodapproximation unentangled, i.e., factorizable. Itisthecoherent superposition ofsuch trajectories that results inanentangled state.

•Jan 1, 2005•0 citations
For an atom in an externally driven cavity, we show that special initial states lead to near-disentangled atom-field evolution, and superpositions of these can lead to near maximally entangled states. Somewhat counterintutively, we find that (moderate) spontaneous emission in this system actually leads to a transient increase in entanglement beyond the steady-state value. We also show that a particular field correlation function could be used, in an experimental setting, to track the time evolution of this entanglement.
We explore the entanglement between a single atom and a single, resonant field mode of a driven optical cavity, focusing on the strong driving regime. We show that, in the absence of spontaneous emission, there are special initial conditions that lead to approximately disentangled trajectories, whereas spontaneous emission results in coherent superpositions of such trajectories that may lead to (transient) near-maximally entangled atom-field states. We also discuss the possibility of using a special "asymmetric" field correlation function to track the time evolution of this entanglement.
We investigate steady state entanglement in an open quantum system, specifically a single atom in a driven optical cavity with cavity loss and spontaneous emission. The system reaches a steady pure state when driven very weakly. Under these conditions, there is an optimal value for atom-field coupling to maximize entanglement, as larger coupling favors a loss port due to the cavity enhanced spontaneous emission. We address ways to implement measurements of the entanglement and find that normalized cross-correlation functions are indicators of the entanglement in the system. The equal time intensity-field cross correlation between the transmitted field of the cavity and the fluorescence intensity is proportional to the entanglement of formation for weak driving fields.
Foranatominadriven cavity wefind states that arehighly entangled, andthat spontaneous emission cantransiently increase entanglement. Wepropose a correlation function measurement anddiscuss timeevolution ofentanglement. C2003Optical Society ofAmerica OCIScodes:270.5580 Quantum Electrodynamics, 270.5290 Photon Statistics Inarecent, beautiful experiment, Auffeves andcoworkers (1) haveverfied theprediction (2)that, fora two-level atominteracting with asingle modeoftheelectromagnetic field, inacoherent state with a moderately large number ofphotons, thenatural evolution ofthesystem leads toasuperposition state inwhich twodifferent states oftheatomarecorrelated with twodistinguishable states ofthefield, in whatisoften referred toasaSchrodinger cat.Suchsuperpositions ofcorrelated states, ifpure, are naturally entangled states. Interestingly, thepossibility ofpreparing suchentangled superpositions in theabove system (which isdescribed bytheso-called Jaynes-Cummings model, orJCM)arises from theexistence, inthis model, ofspecial trajectories along whichthejoint evolution offield andatomis toagoodapproximation unentangled, i.e., factorizable. Itisthecoherent superposition ofsuch trajectories that results inanentangled state.