QuSCo on air

Regular students’ led webinar.

QuSCo on air allows all the members of the consortium to take part to network’s wide seminars, which are planned on regular basis. The seminars aims at consolidating the scientific exchange between the partners while serving also as outreach channel. The webinars are, in fact, recorded and published on our youtube channel. This page will also be updated after each new installment has been made public.

The webinar are organised and moderated by the ESRs

Hyperpolarization with NV centers in diamond for magnetic resonance applications – Anna Parker (NVISION)

Hyperpolarization techniques exploit unique spin systems to increase the sensitivity of magnetic resonance applications, including MRI and NMR spectroscopy. These techniques generally involve coupling a highly polarized spin state, with high electron or nuclear spin alignment, to a nuclear spin ensemble of interest for up to orders of magnitude increase in sensitivity. There are many forms of hyperpolarization technologies, each with their own set of advantages and disadvantages. This talk focuses on my dissertation work, which aimed to implement a polarizer using nitrogen vacancy (NV-) centers in diamond with a hyperpolarization technique called dynamic nuclear polarization (DNP). This technique transfers polarization from a source to a target nuclear spin ensemble by driving weakly-allowed, multi-spin transitions with microwaves. NV- centers in diamond were chosen as a polarization source for their optically-polarizable electron spin state and the favorable properties of diamond. A first iteration of a prototype for a DNP polarizer based off the NV center is presented as well as results showing first steps of hyperpolarizing ensembles of 13C in diamond with varying levels of 13C enrichment. A simple four spin model, including the NV- and its three nearest-neighbor 13C, is used to get a basic understanding of the DNP and ODMR behavior of these NV ensembles. Lastly, ODMR of NV- centers in nanodiamond powder, studied at magnetic fields below and above the NV ground state level anticrossing, is presented and discussed

Commercial software development for quantum control” – Micheal Hush (Q-CTRL)

In this talk, Dr Micheal Hush, Head of Quantum Science and Engineering for the startup Q-CTRL, discusses the topic “Commercial software development for quantum control”. Besides presenting their work, he also delves into the topic of moving from Academia into the startup world.

Quantum theory of parameter estimation – Luca Pezzè (LENS)

In this talk, Dr Luca Pezzè (LENS) gives a pedagogical introduction to parameter estimation, focusing on key concepts such as quantum and classical Cramer-Rao bounds, Fisher information and statistical distinguishability.

He focuses, in particular, on the role played by multipartite entanglement for enhancing the estimation sensitivity over the limit achievable with separable states: he introduces the key notion of useful entanglement in quantum metrology. The theory is illustrated with relevant examples and experimental achievements. Finally, Ihe discusses the current research trends: the quantum Fisher information as a witness of entanglement in complex many-body systems and the simultaneous estimation of multiple parameters.

Three-dimensional localization spectroscopy of individual nuclear spins in diamond

Dr Jonathan Zopes, from Prof Degen group (ETH Zurich) , will present the talk “”Three-dimensional localization spectroscopy of individual nuclear spins in diamond”.

In the first part of the talk a protocol to detect time-dependent magnetic field waveforms using a single NV center will be discussed [1]. This spin-echos based method enables to achieve a time-resolution of  ∼ 20 ns and a sensitivity of ∼ 4 μT/.

In the second part of the talk a method to precisely localize in space the 13C nuclear spin surrounding and interacting with an NV center will be discussed. The idea and the methods of the experiments will be explained in order to achieve a better understanding of the results.

A particular attention will be kept on the experimental methods and on the pulses sequences used during the experiments.

[1] Reconstruction-Free Quantum Sensing of Arbitrary Waveforms, J. Zopes and C.L. Degen, Phys. Rev. Applied 12, 054028

[2] Three-dimensional localization spectroscopy of individual nuclear spins with sub-angstrom resolution, Zopes, J. et al. Nat. Commun. 9, 4678 (2018).18.

[3] Three-dimensional nuclear spin positioning using coherent radio-frequency control, Zopes, J., Herb, K., Cujia, K. S. & Degen, C. L. Phys. Rev. Lett. 121, 170801 (2018)

Upon request of the speaker, the webinar is only available to the members of the consortium

QuSCo Idea Factory special – Preparing your first successful project application for a European call

In this special session of our QuSCo on air webinar we are joined by Prof. Tommaso Calarco (FZJ), chair of the Quantum Community Network, who has several years of coordinating successful projects such as AQUTE, SIQS and RySQ. The topic is “Preparing your first successful project application for a European call”

We encourage to visit the website: qt.eu   and to take part to the consultation at this page https://ec.europa.eu/eusurvey/runner/HorizonEurope_Codesign_2021-2024

Quantum Zeno Dynamics (or how to fight a weeping angel)

What does Quantum Zeno Dynamics have to do with the Doctor Who’s weeping angel?

Come and find out in our third QuSCo on air installment, led by Sabrina Patsch (UNIKASSEL)

The slides connected to this presentation can be found here

Suggested readings:

1] A. Signoles, A. Facon, D. Grosso, I. Dotsenko, S. Haroche, J.-M. Raimond, M. Brune, and S. Gleyzes, Confined quantum Zeno dynamics of a watched atomic arrow, Nat. Phys. 10, 715 (2014).
[2] F. Schäfer, I. Herrera, S. Cherukattil, C. Lovecchio, F. S. Cataliotti, F. Caruso, and A. Smerzi, Experimental realization of quantum zeno dynamics, Nat. Commun. 5, 1 (2014).
[3] P. Facchi and S. Pascazio, Quantum Zeno dynamics: mathematical and physical aspects, J. Phys. A 41, 493001 (2008).
[4] S. Patsch, S. Maniscalco, C. P. Koch, Quantum simulation of non-Markovianity using the quantum Zeno effect, arXiv:1906.11492

Cooperative Pulses for Robust Quantum Optimal Control

Prof. Steffen Glaser of Munich Technical University presents an in-depth lecture about Cooperative pulses for roubust quantum optimal control

The slides connected to this presentation can be found here

Introductory lecture

In this first installment, Dr. Shai Machnes (University of Saarland) gives a general introduction on the topic of Quantum Optimal Control.

The slides connected to this presentation can be found here