EACN Schedule

Last updated: 21.1.2022 14:00.

All times are in Central European Time (CET).

Thursday
Friday
Saturday
Sunday

Thursday 3rd February 2022

15:30 | Coffee (+ Sandwiches)

16:15 | Welcome

16:30 | Dan Kilper (30m)

Driving Forces in Systems Research: from Optical Transmission to Quantum-Optical Transmisison

The early development of fiber optic transmission systems held many similarities to the situation today around the development of entanglement-based quantum communication networks. There were many technologies such as coherent transceivers, all-optical regenerators, and semiconductor optical amplifiers, that emerged as key technologies but, in the end, did not find commercial application, although coherent transceivers finally had their day roughly 20 years later, as several technologies matured. Once optical transmission settled on fiber amplified wavelength division multiplexed systems, research to maximize the bandwidth distance product created a technology race that led to more than five orders of magnitude of capacity growth over several decades. What are the prospects for finding a similar technology evolution in quantum communications that will drive quantum optical transmission systems research? Can it even happen for quantum systems and what can we learn from optical transmission systems?

17:00 | Start Poster Session

18:30 | Dinner

19:30 | After dinner Talk: Matthew Bloch (20m)

20:00 | Panel discussion on security aspects (Füchsel, Lochter)

Friday 4th February 2022

Session 1: QR.X Session

09:00 | Christoph Becher (30m)

Towards elementary quantum repeater links – an overview on the research network QR.X

A quantum repeater enables secure communication in quantum networks based on the distribution of entangled quantum states as a communication resource. In this context, only the concept of quantum repeaters allows for secure communication to be realized over several nodes and thus over arbitrary distances, without having to rely on reliable or secured classical nodes (trusted nodes). The realization of an infrastructure for quantum networks and hardware components for quantum nodes and repeaters is a technically challenging task. Nevertheless, it not only forms the basis for secure quantum communication, but at the same time offers opportunities for other quantum technologies, such as distributed quantum computing or networks of quantum sensors.

The German research network “Quantum Repeater Link – QR.X” investigates a bottom-up approach to realizing basic elements of fiber-based quantum repeaters (QR). QR.X employs three different hardware platforms to realize these elements, i.e. trapped neutral atoms and ions, semiconductor quantum dots and color centers in diamond and created a theoretical model to simulate their performance and guide further developments. The talk will present the basic concepts and an overview on recent experimental achievements in QR.X.

09:30 | Tim van Leent (30m)

Experimental device-independent quantum key distribution

Device-independent quantum key distribution (DIQKD) is the art of establishing secure keys over untrusted channels even when using untrusted devices. It allows the users to check the secure functioning of the underlying quantum devices by leveraging non-classical correlations between measurement results, thereby also ensuring security against implementation flaws—a major vulnerability to quantum key distribution protocols realized so far. Here we present the first experimental system that enables for DIQKD between two distant users. For this, we employ event-ready entanglement between two single-atom quantum memories, independently trapped and manipulated in buildings 400 metres apart. By achieving an entanglement fidelity of 0.892(19) and implementing a DIQKD protocol with random key basis we show that—based on asymptotic security estimates—our system can establish secure keys in a fully device-independent way.

10:15 | Coffee Break

10:35 | Jon Finley (45m)

Hardware for semiconductor-based quantum repeater technologies

Amongst the various hardware platforms explored within the QR.X project, semiconductor quantum dots (QDs) have favorable properties that make them suitable for building quantum links operating over optical fiber channels. They have near-unity quantum efficiencies, can emit near transform-limited single photons at rates approaching ~1GHz, exhibit high photon indistinguishability (>90% HOM) and can generate entangled photon pairs on demand. Their ability to natively emit in the telecoms O- and C-bands and the possibility to integrate them into advanced quantum photonic devices with photon extraction efficiencies >60%, make them highly attractive as quantum sources for field testing of repeater links.

11:20 | Alexander Kubanek (45m)

Towards Quantum Repeater based on SiV- -center in Diamond

Quantum-Repeater and their integration into a Quantum-Networks-Infrastructure is among the most important applications of the upcoming Quantum-Technology. In this talk, I will discuss our recent investigations on SiV- center in diamond towards application as Quantum Repeater. I will discuss main concepts and challenges and focus on the experimental realization of cavity-assisted Spin-Photon interfaces to realize an efficient and scalable platform.

12:05 | Peter van Loock (45m)

Analytical Quantum Repeater Modelling

We give an overview of our efforts to model quantum repeaters for long-range quantum key distribution or more general quantum network applications. Under given experimental assumptions such as the possibility of probabilistic or deterministic entanglement swapping we calculate and optimize the final (secret key) rates for medium-size repeaters including the most important experimental parameters.

13:00 | Lunch

14:00 | Christine Silberhorn (30m)

TBA

To be announced

14:30 | Lee Ray-Kuang [online] (15min)

Machine-learning enhanced quantum state tomography

By implementing machine learning architecture with a convolutional neural network, we illustrate a fast, robust, and precise quantum state tomography for continuous variables, through the experimentally measured data generated from squeezed vacuum states. With the help of machine learning-enhanced quantum state tomography, we also experimentally reconstructed the Wigner’s quantum phase current for the first time. Applications of squeezed states for the implementations of optical cat stats and fault-tolerant quantum computing will also be introduced. At the same time, as a collaborator for LIGO-Virgo-KAGRA gravitational wave network and Einstein Telescope, I will introduce our plan to inject this squeezed vacuum field into the advanced gravitational wave detectors.

14:45 | Alexander Streltsov (15min)

Catalytic Transformations of Pure Entangled States

Abstract: Quantum entanglement of pure states is usually quantified via the entanglement entropy, the von Neumann entropy of the reduced state. Entanglement entropy is closely related to entanglement distillation, a process for converting quantum states into singlets, which can then be used for various quantum technological tasks. The relation between entanglement entropy and entanglement distillation has been known only for the asymptotic setting, and the meaning of entanglement entropy in the single-copy regime has so far remained open. Here we close this gap by considering entanglement catalysis. We prove that entanglement entropy completely characterizes state transformations in the presence of entangled catalysts. Our results imply that entanglement entropy quantifies the amount of entanglement available in a bipartite pure state to be used for quantum information processing, giving asymptotic results an operational meaning also in the single-copy setup.

15:00 | Coffee Break

15:15 | Christian Kurtsiefer (15m)

TBA

To be announced

15:30 | Marcin Jarzyna (15m)

TBA

To be announced

15:45 | Prem Kumar [online] (15m)

TBA

To be announced

16:00 | Francisco Elohim Becerra [online] (15m)

TBA

To be announced

16:15 | Coffee Break

16:45 | Panel Discussion: Quantum Repeater (Becher, Silberhorn, van Loock)

18:00 | Platform meetings (QR.X / 60m)

19:00 | Conference dinner

Saturday 5th February 2022

Industry and Field Trials

09:00 | Marc Geitz (20m)

The OpenQKD/QR.X Testbed in Berlin

The Berlin OpenQKD Testbed demonstrates the integration of QKD technology into a field installed network infrastructure using a PQC secured key management system and hybrid key exchange protocols to secure communication applications. Within QR.X, the testbed’s quantum layer will be enhanced to run entanglement based QKD, demonstrate entanglement swapping and a teleportation experiment under industry lab conditions.

09:20 | Sebastian Schaile (20m)

Compact coolers

To be announced

09:40 | Keavin Füchsel (20m)

From LAB to FAB

To be announced

10:00 | Bart Van der Vecht (20m)

TBA

To be announced

10:20 | Coffee Break

10:40 | Panel (40m)

11:45 | Open Round (45m)

13:00 | Lunch

Networks and Sensing

14:00 | Caspar Hopfmann and Riccardo Bassoli (20m)

Practical quantum networks for 6G: requirements, limitations and perspectives – an experimentalist perspective

In recent years quantum networks have attracted enormous interest due to their enticing promises such as distributed quantum computing, ultra-precise remote synchronization and distributed quantum sensing combined with inherent physically secure communication schemes. While these perspective use-cases and applications have been analyzed from a theoretical view point, the experimental realization of such systems remains a major challenge.

In order to tackle this challenge and realize first practical quantum networks a keen understanding of the current state-of-the-art, the required components as well as their limitations is fundamental. This essential background knowledge will inform current and future research foci of both theory and experiment and enable identification of possible alternatives to existing quantum network paradigms. An example for such an alternative approach are photon graph states – and in particular cluster states – which open up new possibilities for the realization of robust multi-partite entanglement distribution in future quantum networks. Recent experimental advances on photonic graph and cluster-states, high throughput entangled photon pair sources, memory-enhanced entanglement distribution and entanglement swapping bring the goal of practical realization of scalable quantum networks ever closer to reality and promise exciting new perspectives.

14:20 | Wenhan Dai [online] (20m)

14:40 | Kirill Fedorov (20m)

Quantum teleportation of propagating microwaves

To be announced

15:20 | Amit Ashok (20m)

TBA

To be announced

15:40 | Animesh Datta [online] (20m)

TBA

To be announced

16:00 | Coffee Break

16:30 | Panel Discussion (Winter)

18:30 | Dinner

Sunday 6th February 2022

9:30 | Michał Jachura (30m)

TBA

To be announced

10:00 | Michał Parniak (30m)

TBA

To be announced

10:30 | Panel

11:30 | Good Bye

12:00 | Lunch

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