Build up of off-diagonal long-range order in microcavity exciton-polaritons across the parametric threshold

Spano, R.; Cuadra, Jorge; Lingg, C.; Sanvitto, D.; Martin, Michael; Eastham, P. R.; Poel, Mike van der; Hvam, Jørn Märcher; Viña, L.

doi:10.48550/arxiv.1111.4894

Cited by 3 publications

(3 citation statements)

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“…On the other hand, the temporal coherence of each frequency component showed a coherence time in the few 100 ps range, almost a couple of orders of magnitude longer than the polariton lifetime. Even longer coherence times in the ns range was reported in (Spano et al, 2011) using a high-quality sample where the OPO emission enjoys a re- markably good spatial uniformity and spatial coherence: the experimentally observed trends suggest the combined effect of number fluctuations and inter-particle interactions in the condensate as the main source of decoherence according to the single mode model of (Whittaker and Eastham, 2009).…”

Section: Coherence Of the Signal/idler Condensatementioning

confidence: 80%

Quantum fluids of light

2013

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This article reviews recent theoretical and experimental advances in the fundamental understanding and active control of quantum fluids of light in nonlinear optical systems. In presence of effective photon-photon interactions induced by the optical nonlinearity of the medium, a many-photon system can behave collectively as a quantum fluid with a number of novel features stemming from its intrinsically non-equilibrium nature. We present a rich variety of photon hydrodynamical effects that have been recently observed, from the superfluid flow around a defect at low speeds, to the appearance of a Mach-Cherenkov cone in a supersonic flow, to the hydrodynamic formation of topological excitations such as quantized vortices and dark solitons at the surface of large impenetrable obstacles. While our review is mostly focused on a class of semiconductor systems that have been extensively studied in recent years (namely planar semiconductor microcavities in the strong light-matter coupling regime having cavity polaritons as elementary excitations), the very concept of quantum fluids of light applies to a broad spectrum of systems, ranging from bulk nonlinear crystals, to atomic clouds embedded in optical fibers and cavities, to photonic crystal cavities, to superconducting quantum circuits based on Josephson junctions. The conclusive part of our article is devoted to a review of the exciting perspectives to achieve strongly correlated photon gases. In particular, we present different mechanisms to obtain efficient photon blockade, we discuss the novel quantum phases that are expected to appear in arrays of strongly nonlinear cavities, and we point out the rich phenomenology offered by the implementation of artificial gauge fields for photons.Comment: Accepted for publication on Rev. Mod. Phys. (in press, 2012

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Section: Coherence Of the Signal/idler Condensatementioning

confidence: 80%

Quantum fluids of light

2013

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“…Only recently, polariton condensation was experimentally confirmed [4] and it paved the way to the study of many collective quantum phenomena in semiconductor microcavities, such as superfluid properties [5][6][7][8][9][10], or macroscopic phase coherence [11][12][13][14][15]. Many of these results were obtained after quasi-resonant excitation at the inflection point of the lower polariton branch (LPB), in the so-called optical parametric oscillator (OPO) configuration.…”

Section: Introductionmentioning

confidence: 99%

Role of supercurrents on vortices formation in polariton condensates

Anton,

Tosi,

Martin

et al. 2012

Preprint

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Observation of quantized vortices in non-equilibrium polariton condensates has been reported either by spontaneous formation and pinning in the presence of disorder or by imprinting them onto the signal or idler of an optical parametric oscillator (OPO). Here, we report a detailed analysis of the creation and annihilation of polariton vortex-antivortex pairs in the signal state of a polariton OPO by means of a short optical Gaussian pulse at a certain finite pump wave-vector. A time-resolved, interferometric analysis of the emission allows us to extract the phase of the perturbed condensate and to reveal the dynamics of the supercurrents created by the pulsed probe. This flow is responsible for the appearance of the topological defects when counter-propagating to the underlying currents of the OPO signal.

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“…A unique advantage of exciton-polariton condensates is that they can be directly accessed with light, so that various properties such as spin, energy, momentum and phase of the excitation photons are mapped onto polaritons. This attribute has been employed in resonant imprinting of coherence on polariton condensates to generate quantized vortices 16 and to demonstrate long temporal coherence in steady-state condensates using narrowband continuous-wave lasers 18 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced coherence between condensates formed resonantly at different times

et al. 2014

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We demonstrate coherence between exciton-polariton condensates created resonantly at different times. The coherence persists much longer than the individual particle dephasing time, and this persistence increases as the particle density increases. The observed coherence time exceeds that of the injecting laser pulse by more than an order of magnitude. We show that this significant coherence enhancement relies critically on the many-body particle interactions, as verified by its dependence on particle density, interaction strength, and bath temperature, whereas the mass of the particles plays no role in the condensation of resonantly injected polaritons. Furthermore, we observe a large nonlinear phase shift resulting from intra-condensate interaction energy. Our results provide a new approach for probing ultrafast dynamics of resonantly-created condensates and open new directions in the study of coherence in matter.

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Build up of off-diagonal long-range order in microcavity exciton-polaritons across the parametric threshold

Cited by 3 publications

References 1 publication

Quantum fluids of light

Quantum fluids of light

Role of supercurrents on vortices formation in polariton condensates

Enhanced coherence between condensates formed resonantly at different times

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