TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and applications
TOM 7 - Thermal radiation and energy management
TOM 8 - Non-linear and Quantum Optics
TOM 9 - Opto-electronic Nanotechnologies and Complex Systems
TOM 10 - Frontiers in Optical Metrology
TOM 11 - Tapered optical fibers, from fundamental to applications
TOM 12 - Optofluidics
TOM 13 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session
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Session Chair: Sile Nic Chormaic, OIST Graduate University, Japan
3rd floor, 32 seats
2:30pm - 3:00pm Invited ID: 162 / TOM8 S02: 1 TOM 8 Non-linear and Quantum Optics
Superfluid light through dissipation
Giel Keijsers1, Torben Ham1, Zhou Geng1, Kevin J. H. Peters1, Michiel Wouters2, Said R. K. Rodriguez1
1AMOLF, Amsterdam, the Netherlands; 2Universiteit Antwerpen, Antwerp, Belgium
Light in a nonlinear cavity is expected to flow without friction - like a superfluid - under certain conditions. Until now, part-light part-matter (i.e., polariton) superfluids have been observed either at liquid helium temperatures in steady state, or at room temperature for sub-picosecond timescales. Here we report superfluid cavity photons (not polaritons) for the first time. When launching a photon fluid against a defect, we observe a suppression of backscattering above a critical density and below a critical velocity. Room-temperature and steady-state photon superfluidity emerges thanks to the strong thermo-optical nonlinearity of our oil-filled cavity. Surprisingly, dissipationless superfluid flow is achieved by absorptive dissipation inducing the thermal nonlinearity. We also show how the thermal relaxation of the oil sets the timescale at which superfluidity emerges. Our experimental observations are reproduced qualitatively by numerical calculations based on a generalized Gross-Pitaevskii equation for photons coupled to a thermal field. The interpretation of superfluid photons is further substantiated by phase dislocations appearing in the wake of a defect at the breakdown of superfluidity. Our results establish thermo-optical nonlinear cavities as platforms for probing photon superfluidity at room temperature, and offer perspectives for exploring superfluidity in arbitrary potential landscapes using structured mirrors.
3:00pm - 3:30pm Invited ID: 115 / TOM8 S02: 2 TOM 8 Non-linear and Quantum Optics
Quantum vacuum excitation of a quasi-normal mode in an analog model of black hole spacetime
Vacuum quantum fluctuations near horizons are known to yield correlated emission by the Hawking effect. In this talk, I will explain how a 1 dimensional flow of microcavity polaritons may be engineered to produce an effective curved spacetime with a black hole horizon. I will present numerical computations of correlated emission on this spacetime and show that, in addition to the Hawking effect at the sonic horizon, quantum fluctuations may result in a sizeable stationary excitation of a quasi-normal mode of the field theory. Observable signatures of the excitation of the quasi-normal mode are found in the spatial density fluctuations as well as in the spectrum of Hawking emission. I will explain how the driven-dissipative dynamics of the polariton fluid are key to observing the quantum excitation of the quasi-normal mode. Nonetheless, this observation suggests a general and intrinsic fluctuation-driven mechanism leading to the quantum excitation of quasi-normal modes on black hole spacetimes.
3:30pm - 3:45pm ID: 116 / TOM8 S02: 3 TOM 8 Non-linear and Quantum Optics
Paraxial quantum fluids light in hot atomic vapors
Murad Abuzarli, Tangui Aladjidi, Nicolas Cherroret, Quentin Glorieux
Hot atomic vapors are widely used in non-linear and quantum optics due to their large Kerr non-linearity. This non-linearity induces effective photon-photon interactions allowing light to behave as a fluid displaying quantum properties such as superfluidity. In this presentation, I will show that we have full control over the Hamiltonian that drives the system and that we can engineer an analogue simulator with light.
Photonic Maxwell's demon: feed-forward methods for photonic thermodynamic tasks
Laboratoire Kastler Brossel, CNRS, France
Maxwell's Demon is at the heart of the interrelation between quantum information processing and thermodynamics. In this thought experiment, a demon extracts work from two thermal baths at equilibrium by gaining information about them at the single-particle level and applying classical feed-forward operations.
In this talk I will show how to implement a photonic version of Maxwell's Demon with active feed-forward in a fiber-based system using ultrafast optical switches.
This is the first realisation of an active Demon.
The experiment shows that, if correlations exist between the two thermal baths, the Demon can extract over an order of magnitude more work than without correlations.
This demonstrates the great potential of photonic experiments -- which provide a unique degree of control on the system -- to access new regimes in quantum thermodynamics.