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Vincenzo Savona

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Publications associées (95)

Coherent coupling between distant excitons revealed by two-dimensional nonlinear hyperspectral imaging

Vincenzo Savona

Coherent coupling between distant two-level systems is a fundamental process in several physical contexts, from natural photosynthesis to quantum-information processing, where it enables two-qubit operations. For quantum information, qubits based on electr ...

Nature Publishing Group2011

Phonon-Mediated Coupling of InGaAs/GaAs Quantum-Dot Excitons to Photonic Crystal Cavities

Vincenzo Savona, Benjamin Dwir, Elyahou Kapon, Alok Rudra, Kirill Atlasov, Guillaume Jean Tarel, Pascal Gallo, Milan Calic

We demonstrate that the emission characteristics of site-controlled InGaAs/GaAs single quantum dots embedded in photonic crystal slab cavities correspond to single confined excitons coupled to cavity modes, unlike previous reports of similar systems based ...

2011

Polariton Condensation in a One-Dimensional Disordered Potential

Vincenzo Savona, Benoît Marie Joseph Deveaud, Konstantinos Lagoudakis, Barbara Pietka, Luca Fontanesi, Francesco Manni

We study the coherence and density modulation of a nonequilibrium exciton-polariton condensate in a one-dimensional valley with disorder. By means of interferometric measurements we evidence a modulation of the ﬁrst-order coherence function and we relate i ...

American Physical Society2011

Optically Erasing Disorder in Semiconductor Microcavities with Dynamic Nuclear Polarization

Vincenzo Savona, Timothy Chi Hin Liew

The mean squared value of the photonic disorder is found to be reduced by a factor of 100 in a typical GaAs based microcavity when exposed to a circularly polarized continuous wave optical pump without any special spatial patterning. Resonant excitation of ...

American Physical Society2011

Electromagnetic modes of a disordered photonic crystal

Vincenzo Savona

We present a systematic numerical approach to compute the eigenmodes and the related eigenfrequencies of a disordered photonic crystal, characterized by small fluctuations of the otherwise periodic dielectric profile. The field eigenmodes are expanded on t ...

2011

Multipartite polariton entanglement in semiconductor microcavities

Vincenzo Savona, Timothy Chi Hin Liew

We study the entanglement of multiple polariton modes, which results in continuous variable cluster states suitable for quantum computation. Schemes are based on parametric scattering between spin-polarized lower and upper polariton branches in planar micr ...

2011

Fragmentation and the Bose-glass phase transition of the disordered one-dimensional Bose gas

Vincenzo Savona, Luca Fontanesi

We investigate the superfluid-insulator quantum phase transition in a disordered one-dimensional Bose gas in the mean-field limit by studying the probability distribution of the density. The superfluid phase is characterized by a vanishing probability to h ...

2011

Energy relaxation in one-dimensional polariton condensates

Vincenzo Savona, Timothy Chi Hin Liew

We study the kinetics of polariton condensation accounting for the condensation process as well as the energy relaxation of condensed polaritons due to their scattering with phonons and excitons. By assuming a Boltzmann kinetic description of the scatterin ...

2010

Linear spectrum of a quantum dot coupled to a nanocavity

Vincenzo Savona, Guillaume Jean Tarel

We develop a theoretical formalism to model the linear spectrum of a quantum dot embedded in a high-quality cavity, in the presence of an arbitrary mechanism modifying the homogeneous spectrum of the quantum dot. Within the simple assumption of Lorentzian ...

2010

Superfluidity of a nonequilibrium Bose-Einstein condensate of polaritons

Vincenzo Savona

We study theoretically superfluidity in a driven-dissipative Bose gas out of thermal equilibrium, and discuss the relation with conventional superfluids. We show how the superfluid behavior is characterized by a dramatic increase in the lifetime of a quant ...

2010

Single Photons from Coupled Quantum Modes

Vincenzo Savona, Timothy Chi Hin Liew

Single photon emitters often rely on a strong nonlinearity to make the behavior of a quantum mode susceptible to a change in the number of quanta between one and two. In most systems, the strength of nonlinearity is weak, such that changes at the single qu ...

American Physical Society2010

Mean-field phase diagram of the one-dimensional Bose gas in a disorder potential

Vincenzo Savona, Luca Fontanesi

We study the quantum phase transition of the 1D weakly interacting Bose gas in the presence of disorder. We characterize the phase transition as a function of disorder and interaction strengths, by inspecting the long-range behavior of the one-body density ...

2010

Explanation of Photon Correlations in the Far-Off-Resonance Optical Emission from a Quantum-Dot-Cavity System

Vincenzo Savona, Guillaume Jean Tarel, Stefano Portolan

In a coupled quantum-dot–nanocavity system, the photoluminescence from an off-resonance cavity mode exhibits strong quantum correlations with the quantum-dot transitions, even though its autocorrelation function is classical. Using new pump-power dependent ...

American Physical Society2009

Monte Carlo model for the photoluminescence kinetics of a quantum dot embedded in a nanocavity

Vincenzo Savona, Guillaume Jean Tarel

We address the problem of the photoluminescence of a quantum (QD) dot in a nanocavity, with focus on the case of nonzero detuning. In this regime, experiments have shown that strong emission from the cavity-like peak is still present for dot-cavity detunin ...

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2009

Stochastic classical field model for polariton condensates

Vincenzo Savona

We use the truncated Wigner approximation to derive stochastic classical field equations for the description of polariton condensates. Our equations are shown to reduce to the Boltzmann equation in the limit of low polariton density. Monte Carlo simulation ...

2009

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

Vincenzo Savona, Stefano Portolan

We show theoretically that polariton pairs with a high degree of polarization entanglement can be produced through parametric scattering. We demonstrate that entanglement can emerge in coincidence experiments, even at low excitation densities where the dyn ...

IOP Publishing - EPL Association2009

Coherent optical control of the wave function of zero dimensional exciton polaritons

Vincenzo Savona, Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Marcia Portella Oberli, Gaël Nardin, Ounsi El Daïf, Davide Sarchi, Roland Cerna, Barbara Pietka

Control of the wave function of confined microcavity polaritons is demonstrated experimentally and theoretically by means of tailored resonant optical excitation. Three dimensional confinement is achieved by etching mesas on top of the microcavity spacer l ...

2009

Superfluid to Bose-Glass Transition in a 1D Weakly Interacting Bose Gas

Vincenzo Savona, Luca Fontanesi

We study the one-dimensional Bose gas in spatially correlated disorder at zero temperature, using an extended density-phase Bogoliubov method. We analyze, in particular, the decay of the one-body density matrix and the behavior of the Bogoliubov excitation ...

American Physical Society2009

Enhancement of microcavity polariton relaxation under confinement

Vincenzo Savona, Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Gaël Nardin, Ounsi El Daïf, Davide Sarchi, Roland Cerna, Barbara Pietka

We experimentally investigate the relaxation of spatially confined microcavity polaritons. We measure the time- and energy-resolved photoluminescence under resonant excitation and in the low-density regime. In this way, we have access to the time evolution ...

2009

Parametric photoluminescence of spatially confined polaritons in patterned microcavities

Vincenzo Savona

We model the parametric photoluminescence process of laterally confined polaritons in a mesa structure, patterned on a semiconductor microcavity. Parametric processes are described within the lowest order in the polariton-polariton interaction. We show how ...

2008

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