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

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics

Polariton entanglement in the self‐stimulated regime

S. Portolan, Omar Di Stefano, Salvatore Savasta, Fausto Rossi, R. Girlanda

Published Jul 5, 2006• 2 citations
Publisher

Abstract

Abstract We investigate the influence of environmental noise on polariton entangled pairs in the self‐stimulated regime. By adopting a recent separability criterion, we show that self‐stimulation may suppress the detrimental influence of noise on entanglement, but once effective, a noise‐equipped classical model of parametric emission provides the same results of quantum theory with respect to the separability criterion. More generally we show that, in the macroscopic limit, it is not possible to observe violations of local realism with measurements of finite order n ‐particle correlations only. These results provide a prototypical case of the emergence of macroscopic local realism in the presence of strong entanglement even in the absence of decoherence. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssc.200668086

Related papers

Decoherence-free emergence of macroscopic local realism for entangled photons in a cavity

S. Portolan, Omar Di Stefano, Salvatore Savasta +2 more

We investigate the influence of environmental noise on polarization entangled light generated by parametric emission in a cavity. By adopting a recent separability criterion, we show that (i) self-stimulation may suppress the detrimental influence of noise on entanglement, but (ii) once it becomes effective, a noise-equipped classical model of parametric emission provides the same results of quantum theory with respect to the separability criterion. More generally we also show that, in the macroscopic limit, it is not possible to observe violations of local realism with measurements of finite order $n$-particle correlations only. These results provide a prototypical case of the emergence of macroscopic local realism in the presence of strong entanglement even in the absence of decoherence.

arXiv:quant-ph/0502067•Physical Review A•Feb 21, 2006•10 citations

Influence of the phonon‐exciton interaction on exciton‐exciton quantum correlation in semiconductor microcavities

S. Portolan, Omar Di Stefano, Salvatore Savasta +1 more

Abstract We present an extension of the previous descriptions based on the Dynamics Controlled Truncation Scheme of light‐matter interaction beyond mean‐field, including the microscopic description of the exciton‐photon interaction. This enables the microscopic analysis of the influence of decoherence and noise on the polariton quantum correlations originating from nonlinear optical processes. We expand the operators involved in the dynamics in terms of exact eigenstates of the electron system, the photon and phonon operators and treat phonon‐assisted transitions within the Markov approximation. In particular, we present quantum Heisenberg‐Langevin equations describing light‐induced excitations in semiconductor systems interacting with the phonon bath. This theoretical framework is applied to study the influence of dephasing and noise due to photoluminescence on polariton quantum correlations generated by parametric emission in microcavities. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics•Jul 5, 2006•0 citations

Emergence of entanglement out of a noisy environment: The case of microcavity polaritons

S. Portolan, Omar Di Stefano, Salvatore Savasta +1 more

We show theoretically that polariton pairs with a high degree of polarization entanglement can be produced through parametric scattering. We demonstrate that it can emerge in coincidence experiments, even at low excitation densities where the dynamics is dominated by incoherent photoluminesce. Our analysis is based on a microscopic quantum statistical approach that treats coherent and incoherent processes on an equal footing, thus allowing for a quantitative assessment of the amount of entanglement under realistic experimental conditions. This result puts forward the robustness of pair correlations in solid-state devices, even when noise dominates one-body correlations.

arXiv:0810.4603•Europhysics Letters (EPL)•Oct 1, 2009•27 citations

Parametric oscillation in semiconductor microcavities: nonlinear and quantum effects

Jean‐Philippe Karr, A. Baas, Marco Romanelli +2 more

Abstract We report the observation of optical bistability in a semiconductor microcavity pumped at the “magic angle” above the parametric oscillation threshold. Experimental evidence is given in the form of a hysteresis cycle of the nonlinear emission as a function of the pump intensity. A model analogous to those developped for triply resonant Optical Parametric Oscillators (OPO) is in good agreement with the experimental findings. In the second part, we study the potential application of the parametric oscillation regime to quantum optics. The quantum correlations between the emitted “signal” and “idler” beams are computed. We show that very strong quantum correlations between the signal and idler polaritons can be achieved. However the quantum effects in the outgoing light fields are strongly reduced due to the large mismatch in the coupling of the signal and idler polaritons to the external photons. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

physica status solidi (a)•Jan 21, 2005•1 citation

Role of Particle Entanglement in the Violation of Bell Inequalities

Tomasz Wasak, Augusto Smerzi, Jan Chwedeńczuk

Entanglement between two separate systems is a necessary resource to violate a Bell inequality in a test of local realism. We demonstrate that to overcome the Bell bound, this correlation must be accompanied by the entanglement between the constituent particles. This happens whenever a super-selection rule prohibits coherences between states with different total number of particles and thus imposes a constraint on feasible local operations in each sub-system. We show that the necessary entanglement between the particles might solely result from their indistinguishability. We also give an example of both mode and particle-entangled pure state, which does not violate any Bell inequality. Our result reveals a fundamental relation between the non-locality and the particle entanglement.

arXiv:1609.01576•Scientific Reports•Jan 23, 2018•13 citations

Nonclassicality of radiation fields propagating in complex material systems

Dmytro Vasylyev, W. Vogel, Günter Manzke +2 more

Abstract The combination of methods of micro‐ and macroscopic QED alows one to describe the influence of the absorbtion/ amplification and dispersion effects on the nonclassical radiation propagating through complex material systems. Within the framework of macroscopic QED the input‐otput formalism can be applied in order to include the arbitrary quantum state of the radiation field. On the other hand, the microscopic derivation of the emission spectra of a bulk semiconductor gives the physical interpretation of the noise current operators in the macroscopic theory. As an example, we investigate the propagation of the field being in squeezed vacuum state through a 5 μm ZnSe slab in absorbing and amplifying regimes. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

physica status solidi (b)•Nov 26, 2008•5 citations
Abstract We investigate the influence of environmental noise on polariton entangled pairs in the self‐stimulated regime. By adopting a recent separability criterion, we show that self‐stimulation may suppress the detrimental influence of noise on entanglement, but once effective, a noise‐equipped classical model of parametric emission provides the same results of quantum theory with respect to the separability criterion. More generally we show that, in the macroscopic limit, it is not possible to observe violations of local realism with measurements of finite order n ‐particle correlations only. These results provide a prototypical case of the emergence of macroscopic local realism in the presence of strong entanglement even in the absence of decoherence. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We investigate the influence of environmental noise on polarization entangled light generated by parametric emission in a cavity. By adopting a recent separability criterion, we show that (i) self-stimulation may suppress the detrimental influence of noise on entanglement, but (ii) once it becomes effective, a noise-equipped classical model of parametric emission provides the same results of quantum theory with respect to the separability criterion. More generally we also show that, in the macroscopic limit, it is not possible to observe violations of local realism with measurements of finite order nnn-particle correlations only. These results provide a prototypical case of the emergence of macroscopic local realism in the presence of strong entanglement even in the absence of decoherence.
Abstract We present an extension of the previous descriptions based on the Dynamics Controlled Truncation Scheme of light‐matter interaction beyond mean‐field, including the microscopic description of the exciton‐photon interaction. This enables the microscopic analysis of the influence of decoherence and noise on the polariton quantum correlations originating from nonlinear optical processes. We expand the operators involved in the dynamics in terms of exact eigenstates of the electron system, the photon and phonon operators and treat phonon‐assisted transitions within the Markov approximation. In particular, we present quantum Heisenberg‐Langevin equations describing light‐induced excitations in semiconductor systems interacting with the phonon bath. This theoretical framework is applied to study the influence of dephasing and noise due to photoluminescence on polariton quantum correlations generated by parametric emission in microcavities. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We show theoretically that polariton pairs with a high degree of polarization entanglement can be produced through parametric scattering. We demonstrate that it can emerge in coincidence experiments, even at low excitation densities where the dynamics is dominated by incoherent photoluminesce. Our analysis is based on a microscopic quantum statistical approach that treats coherent and incoherent processes on an equal footing, thus allowing for a quantitative assessment of the amount of entanglement under realistic experimental conditions. This result puts forward the robustness of pair correlations in solid-state devices, even when noise dominates one-body correlations.
Abstract We report the observation of optical bistability in a semiconductor microcavity pumped at the “magic angle” above the parametric oscillation threshold. Experimental evidence is given in the form of a hysteresis cycle of the nonlinear emission as a function of the pump intensity. A model analogous to those developped for triply resonant Optical Parametric Oscillators (OPO) is in good agreement with the experimental findings. In the second part, we study the potential application of the parametric oscillation regime to quantum optics. The quantum correlations between the emitted “signal” and “idler” beams are computed. We show that very strong quantum correlations between the signal and idler polaritons can be achieved. However the quantum effects in the outgoing light fields are strongly reduced due to the large mismatch in the coupling of the signal and idler polaritons to the external photons. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Entanglement between two separate systems is a necessary resource to violate a Bell inequality in a test of local realism. We demonstrate that to overcome the Bell bound, this correlation must be accompanied by the entanglement between the constituent particles. This happens whenever a super-selection rule prohibits coherences between states with different total number of particles and thus imposes a constraint on feasible local operations in each sub-system. We show that the necessary entanglement between the particles might solely result from their indistinguishability. We also give an example of both mode and particle-entangled pure state, which does not violate any Bell inequality. Our result reveals a fundamental relation between the non-locality and the particle entanglement.
Abstract The combination of methods of micro‐ and macroscopic QED alows one to describe the influence of the absorbtion/ amplification and dispersion effects on the nonclassical radiation propagating through complex material systems. Within the framework of macroscopic QED the input‐otput formalism can be applied in order to include the arbitrary quantum state of the radiation field. On the other hand, the microscopic derivation of the emission spectra of a bulk semiconductor gives the physical interpretation of the noise current operators in the macroscopic theory. As an example, we investigate the propagation of the field being in squeezed vacuum state through a 5 μm ZnSe slab in absorbing and amplifying regimes. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)