Quantum Science and Nanomaterials (QMat)

⋖QMat Cafe | Academic & Industry Online⋗ series talk from Young Investigators Group at EUR QMat

The speakers for the third edition are:

Dr. Reina Camacho
CNRS/LPNHE | CEVALE2VE and LA-CoNGA Physics

Title : Virtual research and learning networks: the CEVALE2VE and LA-CoNGA Physics cases.

Abstract:
In the information technology era, higher education is becoming more globalized than ever. The links between scientific institutions, universities, society and industry are strengthened. Virtual Research and Learning Networks (VRLC) play a fundamental role in the modernization and internationalization of higher education. VRLCs create and offer new opportunities: multi-institutional links favoring internationalization and diversity, interconnected e-infrastructure, sharing open software and data, cost-effectiveness and increased scientific production (particularly important for small institutions and developing countries). Without going any further, VRLCs contribute to current challenges, such as remote/digital education during the COVID19 pandemic. In this seminar we will talk about VRLCs, in particular we will discuss two cases in Latin America: the Center of high energy studies (CEVALE2VE) and the Latin American alliance for Capacity buildiNG in Advanced Physics (LA-CoNGA physics).

YIG@QMat Organizers:Manuel Morgado - PhD UniStra (morgadovargas@unistra.fr)
Sayali Shevate - PhD UniStra (shevate@ipcms.unistra.fr)Denis Jankovic - Master MCN (denis.jankovic@etu.unistra.fr)

⋖QMat Cafe | Academic & Industry Online⋗ series talk from Young Investigators Group at EUR QMat

The speakers for the third edition are:

Prof. Dr. Isabelle Ripp-Baudot
IPHC - CNRS | Belle II | UniStra

Title : Search for new physics with the Belle II experiment.

Abstract:

The Belle II experiment started to take data last year at the most luminous particle collider in the world. Belle II aims at discovering quantum manifestations of new processes not yet described by known physics laws. This lecture will introduce briefly the standard model of particle physics and explain how particle physicists search for physics beyond it. In a second part, the Belle II experiment will be described and recent hints of intriguing measured discrepancies will be presented, that question what was considered up to now as a fundamental symmetry.



Rashi Jain (PhD Student)
Astronomical Observatory of Strasbourg (ObAS) | UniStra

Title : Globular clusters - Milky Way and beyond.
Link : https://youtu.be/ivwhKt52xbA
Abstract:
Globular clusters are the oldest entities of a galaxy and are close to perfect tracers of history of assembly of their host systems. They are found ubiquitously in all the galaxies. Imaging GCs in galaxies farther away than the local group has been made possible and relatively easily accessible with better optics in ground based telescopes. Beginning from my project in my post graduation, I will take you to visit the basic properties of milky way globular clusters and how these help us understand the basic building blocks that is stars in our own galaxy to the point like GCs in galaxies much farther away to understand their assembly history.

YIG@QMat Organizers:Manuel Morgado - PhD UniStra (morgadovargas@unistra.fr)
Sayali Shevate - PhD UniStra (shevate@ipcms.unistra.fr)Denis Jankovic - Master MCN (denis.jankovic@etu.unistra.fr)

⋖QMat Cafe | Academic & Industry Online⋗ series talk from Young Investigators Group at EUR QMat

The speakers for the third edition are:

Rashi Jain (PhD Student)
Astronomical Observatory of Strasbourg (ObAS) | UniStra

Title : Globular clusters - Milky Way and beyond.

Abstract:
Globular clusters are the oldest entities of a galaxy and are close to perfect tracers of history of assembly of their host systems. They are found ubiquitously in all the galaxies. Imaging GCs in galaxies farther away than the local group has been made possible and relatively easily accessible with better optics in ground based telescopes. Beginning from my project in my post graduation, I will take you to visit the basic properties of milky way globular clusters and how these help us understand the basic building blocks that is stars in our own galaxy to the point like GCs in galaxies much farther away to understand their assembly history.

Prof. Dr. Isabelle Ripp-Baudot
IPHC - CNRS | Belle II | UniStra

Title : Search for new physics with the Belle II experiment.
Link : https://youtu.be/RxT2Ho7Q-54
Abstract:
The Belle II experiment started to take data last year at the most luminous particle collider in the world. Belle II aims at discovering quantum manifestations of new processes not yet described by known physics laws. This lecture will introduce briefly the standard model of particle physics and explain how particle physicists search for physics beyond it. In a second part, the Belle II experiment will be described and recent hints of intriguing measured discrepancies will be presented, that question what was considered up to now as a fundamental symmetry.

YIG@QMat Organizers:Manuel Morgado - PhD UniStra (morgadovargas@unistra.fr)
Sayali Shevate - PhD UniStra (shevate@ipcms.unistra.fr)Denis Jankovic - Master MCN (denis.jankovic@etu.unistra.fr)

⋖QMat Cafe | Academic & Industry Online⋗ series talk from Young Investigators Group at EUR QMat

The speaker for the second edition is:



Prof. Dr. Andreas WallraffDepartment of Physic | Quantum Device Lab (QuDev) | ETH Zürich

Building an error-corrected superconducting quantum processor

Abstract:
Superconducting circuits are a prime contender both for addressing noisy intermediate-scale quantum (NISQ) problems and for realizing universal quantum computation in fault-tolerant processors. Superconducting circuits also play an important role in state-of-the-art quantum optics experiments at microwave frequencies and provide interfaces in hybrid systems when combined with semiconductor quantum dots, color centers or mechanical oscillators. I will begin this talk with an introduction to the quantum physics of superconducting circuits. I will then discuss our experimental efforts towards realizing quantum error correction in superconducting circuits, which is an essential ingredient for reaching the full potential of fault-tolerant universal quantum computation. We pursue an approach based on the surface code in which we redundantly encode a logical qubit into a set of physical qubits. Using seven superconducting qubits, we have experimentally implemented the smallest viable instance of such a surface code, capable of repeatedly detecting any single error. We perform our experiments in a multiplexed device architecture [1], which enables fast, high fidelity, single-shot qubit readout [2], unconditional reset [3], and high fidelity single and two- qubit gates. Using ancilla-based stabilizer measurements, we initialize the cardinal states of the encoded logical qubit with high fidelity. We then repeatedly check for errors using the stabilizer readout and observe that the logical quantum state is preserved with a lifetime and coherence time longer than those of any of the constituent qubits, when no errors are detected [4]. Thus, we demonstrate an enhancement of the conditioned logical qubit coherence times beyond the coherences of its best constituent physical qubits. We are extending our current device architecture to a 17 qubit surface code, capable of not only detecting errors but also correcting errors using real-time feedback as demonstrated in our recent entanglement stabilization experiment [5].

References

[1] J. Heinsoo et al., Phys. Rev. Applied 10, 034040 (2018)
[2] T. Walter et al., Phys. Rev. Applied 7, 054020 (2017)
[3] P. Magnard et al., Phys. Rev. Lett. 121, 060502 (2018)
[4] C. Kraglund Andersen et al., arXiv:1912.09410 (2019)
[5] C. Kraglund Andersen et al., npj Quantum Information 5, 69 (2019)

YIG@QMat Organizers:Manuel Morgado - PhD UniStra (morgadovargas@unistra.fr)
Sayali Shevate - PhD UniStra (shevate@ipcms.unistra.fr)Denis Jankovic - Master MCN (denis.jankovic@etu.unistra.fr)

⋖QMat Cafe | Academic & Industry Online⋗ series talk from Young Investigators Group at EUR QMat

The speakers for the first edition are:

Denis Jankovic - MSc student of Magistere in Physics: MCN | UniStra | QMat fellow
Title: Nuclear spins in Single-Molecule Magnets as qudits. Case study of Pc2Tb.
Abstract:
A qudit is a d-level quantum physical level that can for example allow for a bigger density of quantum information storing, compared to a qubit (2-level system). Terbium Bisphthalocyanine or Pc2Tb is a Single-Molecule Magnet (SMM) with a central ion : Tb^3+. Progress has been made by Wolfgang Wernsdorfer (KIT) and Mario Ruben (IPCMS/KIT) to use the nuclear spin levels (I=3/2) of this central ion as a physical qudit(d=4). This talk will cover the approach used to modelize this SMM energy levels and the electronic wavefunction of the Tb ion, with an emphasis on its hyperfine electric and magnetic interactions. The goal being the quantification of the linear Stark effect arising from applying an electric field on the molecule that in turn affects the hyperfine coupling strength between the electronic states of the central ion and its nuclear states. This effect was shown by S. Thiele (Inst. Néel) et al Science 344, 1135 (2014).

Sergio Cantu - PhD student | MIT | Center of Ultracold Atoms
Link : https://youtu.be/zuNfXPX62lA
Title: Engineering photon states using Rydberg Polaritons
Abstract:
The ability to tune and control strongly interacting systems is one of the central challenges in modern physical science. Although photon−photon interactions are typically negligible in conventional optical media, hybridizing light with ensembles of strongly interacting particles has emerged as a promising route toward achieving few-photon nonlinearities. In this talk, I will cover one approach that interfaces light with highly excited atomic Rydberg states by means of electromagnetically induced transparency (EIT), an approach which allows to induce strong interactions between freely propagating photons in the form of polaritons. These observations pave the way for complex many-body physics of Rydberg polaritons, and as possible interface for hybrid quantum systems.​