Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Askitopoulos, Alexis"'
Photonic Ising Machines constitute an emergent new paradigm of computation, geared towards tackling combinatorial optimization problems that can be reduced to the problem of finding the ground state of an Ising model. Spatial Photonic Ising Machines
Externí odkaz:
http://arxiv.org/abs/2407.09161
Autor:
Wang, Richard Zhipeng, Cummins, James S., Syed, Marvin, Stroev, Nikita, Pastras, George, Sakellariou, Jason, Tsintzos, Symeon, Askitopoulos, Alexis, Veraldi, Daniele, Strinati, Marcello Calvanese, Gentilini, Silvia, Pierangeli, Davide, Conti, Claudio, Berloff, Natalia G.
We explore the potential of spatial-photonic Ising machines (SPIMs) to address computationally intensive Ising problems that employ low-rank and circulant coupling matrices. Our results indicate that the performance of SPIMs is critically affected by
Externí odkaz:
http://arxiv.org/abs/2406.01400
Autor:
Baryshev, Stepan, Zasedatelev, Anton V., Sigurdsson, Helgi, Gnusov, Ivan, Töpfer, Julian D., Askitopoulos, Alexis, Lagoudakis, Pavlos G.
We implement full polarization tomography on the photon correlations in a spinor exciton-polariton condensate. Our measurements reveal condensate pseudospin mean-field dynamics spanning from stochastic switching between linear polarization components
Externí odkaz:
http://arxiv.org/abs/2012.02774
Autor:
Alyatkin, Sergey, Sigurdsson, Helgi, Askitopoulos, Alexis, Töpfer, Julian D., Lagoudakis, Pavlos G.
One of the recently established paradigms in condensed matter physics is examining a system's behaviour in artificially constructed potentials, giving insight into physical phenomena of quantum fluids in hard-to-reach settings. A prominent example is
Externí odkaz:
http://arxiv.org/abs/2007.02807
Autor:
Askitopoulos, Alexis, Sigurdsson, Helgi, Gnusov, Ivan, Alyatkin, Sergey, Pickup, Lucy, Gippius, Nikolay A., Lagoudakis, Pavlos G.
First order coherence measurements of a polariton condensate, reveal a regime where the condensate pseudo-spin precesses persistently within the driving optical pulse. Within a single 20 $\mu$s optical pulse the condensate pseudo-spin performs over $
Externí odkaz:
http://arxiv.org/abs/2006.01741
Autor:
Gnusov, Ivan, Sigurdsson, Helgi, Baryshev, Stepan, Ermatov, Timur, Askitopoulos, Alexis, Lagoudakis, Pavlos G.
Publikováno v:
Phys. Rev. B 102, 125419 (2020)
We investigate the optical orientation, polarization pinning, and depolarization of optically confined semiconductor exciton-polariton condensates. We perform a complete mapping of the condensate polarization as a function of incident nonresonant exc
Externí odkaz:
http://arxiv.org/abs/2004.11607
Autor:
Askitopoulos, Alexis, Pickup, Lucy, Alyatkin, Sergey, Zasedatelev, Anton, Lagoudakis, Konstantinos G., Langbein, Wolfgang, Lagoudakis, Pavlos G.
Coherent bosonic ensembles offer the promise of harnessing quantum effects in photonic and quantum circuits. In the dynamic equilibrium regime, the application of polariton condensates is hindered by exciton-polariton scattering induced de-coherence
Externí odkaz:
http://arxiv.org/abs/1911.08981
Autor:
Alyatkin, Sergey, Töpfer, Julian D., Askitopoulos, Alexis, Sigurdsson, Helgi, Lagoudakis, Pavlos G.
Publikováno v:
Phys. Rev. Lett. 124, 207402 (2020)
We demonstrate deterministic control of the nearest and next-nearest neighbor coupling in the unit cell of a square lattice of microcavity exciton-polariton condensates. We tune the coupling in a continuous and reversible manner by optically imprinti
Externí odkaz:
http://arxiv.org/abs/1907.08580
Autor:
Georgiou, Kyriacos, Jayaprakash, Rahul, Askitopoulos, Alexis, Coles, David M., Lagoudakis, Pavlos G., Lidzey, David G.
We explore the generation of anti-Stokes fluorescence from strongly coupled organic dye microcavities following resonant ground-state excitation. We observe polariton emission along the lower polariton branch, with our results indicating that this pr
Externí odkaz:
http://arxiv.org/abs/1804.06832
Autor:
Askitopoulos, Alexis
Semiconductor Microcavities in the strong coupling regime are an ideal test bed for studying light matter interactions at the micro-scale. The eigenstates of these systems, exciton-polaritons, are bosonic hybrid light matter quasi-particles that have
Externí odkaz:
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678171