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Keynote Lectures

Tailoring Light Emission with Metasurfaces
Jean-Jacques Greffet, Laboratoire Charles Fabry, Institut d'Optique Graduate School, Université Paris-Saclay, France

Quantum Optical Heat Machines: Engines, Refrigerators, Transistors
Gershon Kurizki, Weizmann Institute of Science, Israel


Tailoring Light Emission with Metasurfaces

Jean-Jacques Greffet
Laboratoire Charles Fabry, Institut d'Optique Graduate School, Université Paris-Saclay

Brief Bio
Jean-Jacques Greffet received his PhD in solid state physics in 1988 from Université Paris-Sud. He is a professor at Institut d'Optique, Université Paris-Saclay and a senior member of Institut Universitaire de France. He made several contributions to light scattering of electromagnetic waves and to the theory of near-field microscopy. He then explored the role of surface phonon polaritons to modify near-field radiative heat transfer and discovered coherent thermal emission. He contributed to the field of nanoantennas to control lifetime and directional emission of quantum emitters. His current research interests deals with revisiting fundamental quantum optics experiments with surface plasmons (wave-particle duality, Hong Ou Mandel experiment, photon-plasmon entanglement, electrical emission by tunnel effect) and controlling light-matter interaction at the nanoscale using resonators and collective effects. He is an OSA fellow and the recipient of the Servant prize of the french Academy of Science.

A large number of light sources such as LEDs or incandescent sources operate in the spontaneous emission regime. In this regime, the microscopic emission events are uncorrelated leading to emission of incoherent fields with uncontrolled emission dynamics.  In the case of a single emitter such as an atom or a molecule, it is known that spontaneous emission can be modified by coupling the emitter to a cavity or resonant nanoantenna. In this talk, we consider tailoring light emission by a macroscopic ensemble of thermalized emitters by coupling them to a resonant metasurface. We will discuss how to control spatial coherence, temporal coherence and time dynamics of the emission of this ensemble.



Quantum Optical Heat Machines: Engines, Refrigerators, Transistors

Gershon Kurizki
Weizmann Institute of Science

Brief Bio
Professor Gershon Kurizki joined the Weizmann Institute of Science (WIS) in 1985, where he became tenured Professor in 1991. He holds the G.W. Dunne Professorial Chair in Quantum Optics at WIS since 1998. His fields of international renown include Quantum Thermodynamics and Control of Open Quantum-Systems; Quantum Optics and Quantum Light-Matter Interactions. He has published over 60 high-profile articles (Phys.Rev.Letters, Nature and PNAS) out of 250 publications thus far (h-index: 56; i-10 index: 162, 11000 citations). He has delivered over 250 invited and plenary talks at international conferences/ workshops so far. His recognition includes: the Optical Society of America Fellowship (since 1999); the American Physical Society (APS) Fellowship (since 2002); the UK Institute of Physics Fellowship (since 2004); the Lamb Award in Laser Physics and Quantum Optics (2008); the Humboldt-Meitner Award in Atomic Physics (2009). He publishes philosophical essays and poetry and has written a popular science book (“The Quantum Matrix” Oxford Univ. Press (2020)). Kurizki’s research on the control of open quantum systems, their bath-induced interactions and thermodynamic aspects has yielded a number of groundbreaking discoveries, supported by experiment, that have impacted diverse fields and deepened our understanding of quantum system-bath interactions. One intriguing insight is that “the bath is more a friend than a foe”: it can be a probe, a diagnostic tool or a resource of quantumness. His discoveries have been recognized by his APS Fellow citation (2002): "For discovering innovative approaches to the control of the quantum properties of fields interacting with matter"; the Lamb Award citation (2008): "For his discovery of the anti-Zeno effect and his pioneering contributions to the theory of quantum measurements and decoherence control in quantum open systems " and the Meitner- Humboldt Award laudatio (2009): “In recognition of his exceptional achievements in quantum optics, his ground-breaking contributions to the control of decoherence and his pioneering investigations of the Zeno and anti-Zeno effects in quantum open systems as links between the quantum and classical pictures of the world." 

The upsurge of interest in the field known as quantum thermodynamics (QTD) has not yet resolved the key issue: Are there truly advantageous quantum resources that can boost the performance of thermodynamic (TD) machines? The resolution of this issue requires a grasp of the principles and bounds that rule quantum machines powered by heat[1]. To this end, we invoke the work-capacity of  quantum states[2] and propose a quantum-optical procedure for its conversion  via coherent control and quantum measurements[3] into work. This procedure may allow us to maximize the work extractable from heat machines, as well as operate them as quantum heat transistors or heat diodes. The inverse regime of such machines entails cold-bath refrigeration [4] by heat transfer to a hotter bath. We find that, contrary to common claims, quantum advantage in machines[5] is very hard to come by. We have identified such an advantage, obtained by driving the working medium at a fast rate compatible with the non-Markovian anti-Zeno regime[6-7]. This quantum advantage is manifest by a nearly 10-fold boost in power output. Ongoing experimental efforts to implement the foregoing schemes will be surveyed.

[1] D. Gelbwaser, W. Niedenzu, and G. Kurizki, Adv. At. Mol. Opt. Phys. 64, 329 (2015): 136 citations; A.Ghosh, D.Gelbwaser, W. Niedenzu, A. Lvovski, I. Mazets, M.O. Scully and G. Kurizki, PNAS 115, 9941 (2018):18 citations.
[2] W. Niedenzu, V. Mukherjee, A. Ghosh, A.G. Kofman, and G. Kurizki, Nat. Commun. 9, 165 (2018): 99 citations; NJP 18, 083012 (2016): 80 citations.
[3] T. Opatrný, G. Kurizki, and D.-G. Welsch, Phys. Rev. A 61, 032302 (2000): 393 citations.
[4] M. Kolar, D. Gelbwaser, R. Alicki, and G. Kurizki, Phys. Rev. Lett. 109, 090601 (2012): 89 citations; D. Gelbwaser, R. Alicki, G .Kurizki, PRE 87, 012140 (2013): 129 citations.
[5] G.Kurizki et al, PNAS 112, 3866 (2015): 425 citations. 
[6] N. Erez, G. Gordon, M. Nest, and G. Kurizki, Nature 452, 724 (2008): 198 citations; A.G. Kofman and G. Kurizki, Nature 405, 546 (2000): 519 citations.
[7] V.Mukherjee, A.G. Kofman and G. Kurizki, Commun. Phys. 3, 1 (2020).