[Todos] Mini Workshop con el Russian Quantum Center

[Christian Schmiegelow]

Invitamos a la comunidad a participar del mini workshop que se organizó por
la visita de investigadores del Russian Quantum Center a la Argentina. Se
llevará a cabo este* lunes 28 en el aula Federman*, Departamento de Física,
Pab. I, FCEN, UBA.

El evento comenzará con las presentaciones del Programa Interinstitucional
de Fortalecimiento de la Ciencia y Tecnología Cuánticas (Arg.) y del
Russian Quantum Center (RQC). Luego contaremos con 5 charlas científicas a
cargo de investigadores del RUC, de 30 minutos cada una intercaladas con
charlas cortas de perspectivas de las líneas de investigación en cuántica
en el AMBA, Argentina.

El objetivo del encuentro es conocer sobre investigación en común y tender
lazos para futuras colaboraciones.

*Cronograma*
9:45 Reception
10:00 Presentation of the Argentinian Quantum Science and Technology Program
10:30 Presentation of the Russian Quantum Center
11:00 Coffee Break
11:30 Experimental Quantum Physics with atoms in argentina
11:45 RQC presentation "Towards quantum simulations with ultracold thulium
atoms at an optical lattice formed by 1064 nm laser light"
12:15 Theoretical Quantum Physics at UBA
12:30 Theoretical Quantum Physics at UNLP-IFLP
12:45 RQC presentation "Quantum algorithms and software in the NISQ era"
13:15 Lunch Break
14:30 Experimental Quantum Photonics in Argentina
14:45 RQC presentation "Nanophotonics and ultrafast magnetism in
dielectrics; 1D and 2D materials for quantum technologies"
15:15 RQC presentation "Quantum computing with atoms and photons"
15:45 Short break
16:00 Experimental Quantum solid-state physics in argentina.
16:15 RQC presentation "Polariton platform for quantum computing"
16:45 Lab Tours.

Resúmenes de las Charlas del Russian Quantum Center:

*Alexey Akimov, PI of the “Quantum Simulators and Integrated Photonics”
group*

*Towards quantum simulations with ultracold thulium atoms at an optical
lattice formed by 1064 nm laser light*

Bose-Einstein condensation (BEC) is a powerful tool for a wide range of
research activities, a large fraction of which is related to quantum
simulations. Various problems may benefit from different atomic species.
Thulium atoms possess dipole moment of 4 Bohr magneton in the ground state,
allowing long-term interactions. It also has number of non-chaotic
low-field Feshbach resonances, allowing fine control of the near-filed
interactions. It also has relatively simple level structure compared to the
other magnetic lanthanoids and thus is a quite promising subject for
applications in quantum simulations.

Nevertheless, cooling down novel species interesting for quantum
simulations to BEC temperatures requires a substantial amount of
optimization and is usually considered to be a difficult experimental task.
Specifically, previous attempts of cooling thulium atom to Bose-Einstein
condensation temperature at 532 nm dipole trap were not successful.

Here we report on implementation of the Bayesian machine learning technique
to optimize the evaporative cooling of thulium atoms and achieved BEC in an
optical dipole trap. The developed approach could be used to cool down
other novel atomic species to quantum degeneracy without additional studies
of their properties. We also analyzed the atomic loss mechanism for the 532
nm optical trap, used in the Bose-condensation experiment, and compares it
with the alternative and more traditional micron-range optical dipole trap.

While the condensate of the thulium atom has a lot of applications in
quantum simulations and other areas of physics, it can also serve as a
unique diagnostic tool for many atomic experiments. In the present study,
the Bose-Einstein condensate of the thulium atom was successfully utilized
to diagnose an optical lattice and detect unwanted reflections in the
experiments with the 1064 nm optical lattice, which will further be used in
a quantum gas microscope experiment.



*Aleksey Fedorov, PI of the “Quantum Information Technologies” group*

*Quantum algorithms and software in the NISQ era *

Quantum computing is aimed to solve tasks, which are believed to be
exponentially hard to existing computational devices and tools. A prominent
example of such classically hard problems is simulating complex quantum
many-body systems, in particular, for quantum chemistry. However, solving
realistic problems with quantum computers encounters various difficulties,
which are related, first, to limited computational capabilities of existing
quantum devices and, second, to the efficiency of algorithmic approaches.
In the present work, we address the algorithmic side of quantum computing.
I will review recent progress in quantum algorithms for NISQ era devices,
both in the context of their characterization and solving prototypes of
useful tasks with them. I will also cover recent results on qudit-based
computing with trapped ions and other physical platforms.



*Alexander Chernov, PI of the “Quantum Spintronics and Low-Dimensional
Materials” group*

*Nanophotonics and ultrafast magnetism in dielectrics; 1D and 2D materials
for quantum technologies*

Excitation and control of magnons by laser pulses opens up new
possibilities for applications including opto-magnetic magnetization
switching for information recording, all-optical excitation of spin waves,
and also allows new approaches for information processing with ultra-low
energy dissipation. However, the possibility of subwavelength localization
of light in magnetic structures, leading to efficient excitation of
magnons, which by their nature do not absorb light, has so far been
lacking. We have succeeded in combining nanophotonics and laser-induced
ultrafast magnetism to effectively excite and control spin dynamics in
magnetic dielectric structures.

In the second part of the talk, I will demonstrate the experimental results
of induced interaction between magnetic dielectric films and 2D materials
and the way how we intend to study quantum materials at femtosecond
timescales. I will address the opportunities of 1D and 2D materials for
quantum technologies, including quantum simulator based on 2D materials.



*Stanislav Straupe, PI of the “Atomic and optical quantum computing” group*

*Quantum computing with atoms and photons*

I will overview the experimantal research in our group aimed at developing
prototypes of digital quantum computers using two different hardware
platforms. The first platform is based on single trapped neutral atoms in
arrays of optical tweezers. I will describe the techniques which we use to
create uniformly filled arrays of single Rubidium atoms with individual
addressing. We will discuss the implementation of fast and high-fidelity
single qubit oerations on hyperfine qubits and prospects towards realizing
high-fidelity two-qubit operations using targeted Rydberg excitation of
individual atoms. The second part of my talk will describe linear-optical
approach to quantumcomputing. I will present experiments using quantum
dot-based single photon sources and programmable integrated optics created
by femtosecond laser writing. I will also talk about our efforts towards
creating a fully integrated quantum photonic processor based on SiN
integrated waveguides and on-chip superconducting detectors.



*Alexey Kavokin, PI of the “Quantum Polaritonics” group*

*Polariton platform for quantum computing *

Exciton-polaritons are bosinic quasiparticles that combine properties of
photons and excitons: hydrogen-like crystal excitations. The Bose-Einstein
condensation and superfluidity of exciton-polaritons have been
experimentally observed in 2008 and 2015, respectively. In 2018 we have
proposed the concept of a qubit based on a ring shape polariton condensate
with quantized states characterized by discrete topological charges. The
concept has been put in practice. By 2023 an Ising simulator based on 22
polariton qubits has been demonstrated, single and double qubit gates
developed. I will overview the progress in quantum Polaritonics and address
its perspectives.

*Oradores a cargo de la perspectiva argentina:*

Presentation of the Argentinian Quantum Science and Technology Program -
Juan Pablo Paz and Marcos Saraceno
Experimental Quantum Physics with atoms in argentina - Christian Schmiegelow
Theoretical Quantum Physics at UBA - Augusto Roncaglia
Theoretical Quantum Physics at UNLP-IFLP -  Federico Holik
Experimental Quantum Photonics in Argentina - Miguel Larotonda
Experimental Topological Quantum Solid-state Physics in Argentina - Mariano
Real
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