Contributed Talks 5a
Fri, 6 Sep
, 09:10 - 10:50
- QUBE - A CubeSat mission to demonstrate new building blocks for satellite based quantum key distributionJonas Pudelko (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)); Michael Auer (Ludwig Maximilian University (LMU)); Adomas Baliuka (Ludwig Maximilian University (LMU)); Ömer Bayraktar (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)); Moritz Birkhold (Ludwig Maximilian University (LMU)); Peter Freiwang (Ludwig Maximilian University (LMU)); Matthias Grünefeld (OHB System AG); Roland Haber (Center for Telematics (ZfT)); Martin Hutterer (OHB System AG); Janko Janusch (OHB System AG); Imran Khan (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)); Lukas Knips (Ludwig Maximilian University (LMU)); Norbert Lemke (OHB System AG); Christoph Marquardt (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)); Florian Moll (German Aerospace Center (DLR)); Benjamin Rödiger (German Aerospace Center (DLR)); Klaus Schilling (Center for Telematics (ZfT)); Christopher Schmidt (German Aerospace Center (DLR)); Bhardwaj Shastri (Center for Telematics (ZfT)); Michael Steinberger (Ludwig Maximilian University (LMU); Karina Szych (OHB System AG); Joost Vermeer (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Paul Wagner (German Aerospace Center (DLR IKN) ); Harald Weinfurter (Ludwig Maximilian University (LMU)[abstract]Abstract: The CubeSat mission QUBE aims to evaluate novel, miniaturized Quantum Key Distribution (QKD) building blocks in space including an optical downlink to an optical ground station. The mission will be launched in July 2024 and will provide important insights into new technology which potentially could form the backbone of a cost-effective satellite based QKD system on a global scale.
- Heralded entanglement of solid-state qubits at metropolitan scaleArian Stolk (QuTech, Delft University of Technology); Kian van der Enden (QuTech, Delft University of Technology); Marie-Christine Slater (AIT Austrian Institute of Technology GmbH); Ingmar te Raa-Derckx (QuTech, Delft University of Technology); Pieter Botmar (QuTech, Delft University of Technology); Joris van Rantwijk (QuTech, Delft University of Technology); Benjamin Biemond (Netherlands Organisation for Applied Scientific Research (TNO); Ronald Hagen (Netherlands Organisation for Applied Scientific Research (TNO); Rodolf Herfst (Netherlands Organisation for Applied Scientific Research (TNO); Wouter Koek (Netherlands Organisation for Applied Scientific Research (TNO); Arjan Meskers (Netherlands Organisation for Applied Scientific Research (TNO); René Vollmer (Netherlands Organisation for Applied Scientific Research (TNO); Erwin van Zwet (Netherlands Organisation for Applied Scientific Research (TNO); Matthew Markham (Element Six Innovation); Andrew Edmonds (Element Six Innovation); Fabian Geus (Fraunhofer Institute for Laser Technology ILT); Florian Elsen (Fraunhofer Institute for Laser Technology ILT); Bernd Jungbluth (Fraunhofer Institute for Laser Technology ILT); Constantin Haefner (Fraunhofer Institute for Laser Technology ILT); Christoph Tresp (TOPTICA Photonics AG); Jürgen Stuhler (TOPTICA Photonics AG); Stephan Ritter (TOPTICA Photonics AG); and Ronald Hanson (QuTech, Delft University of Technology)[abstract]Abstract: We present a deployed quantum link between the Dutch cities Delft and The Hague separated by 10 kilometers, capable of generating solid-state heralded entanglement. This link is realized by employing NV center end nodes, connecting them with state-of-the-art Quantum Frequency Converters and a phase-stabilized architecture over 25 kilometers of telecom fiber. By capitalizing on the full heralding capabilities of the network link in combination with real-time feedback logic on the long-lived qubits, we demonstrate the delivery of a predefined entangled state on the nodes irrespective of the detector outcome. The extendable design, real-time control and compatibility with other qubit platforms and makes this architecture an excellent candidate for future metropolitan scale quantum networks.
- Experimental Sample-Efficient Device-Independent Verification and Certification of a 4-qubit GHZ stateLaura dos Santos Martins (LIP6 - Sorbonne Université); Nicolas Laurent-Puig (LIP6 - Sorbonne Université); Ivan Šupić (LIP6 - Sorbonne Université); Pascal Lefebvre (LIP6 - Sorbonne Université); Damian Markham (LIP6 - Sorbonne Université); and Eleni Diamanti (LIP6 - Sorbonne Université)[abstract]Abstract: Authentication of quantum resources is a critical tool in the development of quantum information processing protocols. In particular, the verification of quantum states is often used as a building block for communication tasks, determining whether the communicating parties can trust the resources at hand to exchange information or whether the protocol should be aborted. Self-testing methods have been used to tackle such verification tasks in a device-independent (DI) scenario. However, these approaches commonly consider the limit of large, identically and independently distributed (IID) samples, which weakens the DI claim and poses serious challenges to their experimental implementation. To address these issues, Gocanin et al. [1] developed a protocol to certify quantum states in the few-copies and non-IID regime. In this work, we adopt their protocol to experimentally demonstrate the device-independent verification of a four-photon GHZ state, produced with our compact and high-fidelity multipartite entangled photon source.
- Composable discrete-modulated continuous-variable QKD and its application to urban atmospheric channelsKevin Jaksch (Max Planck Institute for the Science of Light, Erlangen, Germany); Thomas Dirmeier (Max Planck Institute for the Science of Light, Erlangen, Germany); Jan Schreck (Max Planck Institute for the Science of Light, Erlangen, Germany); Yannick Weiser (Max Planck Institute for the Science of Light, Erlangen, Germany); Stefan Richter (Max Planck Institute for the Science of Light, Erlangen, Germany); Ömer Bayraktar (Max Planck Institute for the Science of Light, Erlangen, Germany); Bastian Hacker (Max Planck Institute for the Science of Light, Erlangen, Germany); Conrad Rößler (Max Planck Institute for the Science of Light, Erlangen, Germany); Imran Khan (Max Planck Institute for the Science of Light, Erlangen, Germany); Andrej Krzic (Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany); Markus Rothe (Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany); Markus Leipe (Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany); Nico Döll (Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany); Christopher Spiess (Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany); Matthias Goy (Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany); Stefan Petscharning (Austrian Institute of Technology, Center for Digital Safety&Security, Vienna, Austria); Thomas Grafenauer (Austrian Institute of Technology, Center for Digital Safety&Security, Vienna, Austria); Bernhard Ömer (Austrian Institute of Technology, Center for Digital Safety&Security, Vienna, Austria); Christoph Pacher (Austrian Institute of Technology, Center for Digital Safety&Security, Vienna, Austria); Florian Kanitschar (Austrian Institute of Technology, Center for Digital Safety&Security, Vienna, Austria); Twesh Upadhyaya (Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Canada); Jie Lin (Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Canada); Norbert Lütkenhaus (Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Canada); Gerd Leuchs (Max Planck Institute for the Science of Light, Erlangen, Germany); and Christoph Marquardt (Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany)[abstract]Abstract: In our work, we developed an optical CVQKD system that uses polarization-based QPSK modulation designed for atmospheric quantum communication and a corresponding post-processing pipeline including error correction and privacy amplification. In a first laboratory experiment, we applied the security statement of a recently published security proof to calculate composable key rates with a total security parameter of ε = 1e-10 in the finite size regime against i.i.d. collective attacks. We also used the post-processing pipeline to study the effect of error correction and frame errors on the actual key extraction in a finite-size system – finding that the common approach of going to high frame errors to increase the ECC efficiency β does not optimize the extractable key length.Furthermore, we deployed the system over an ad-hoc atmospheric channel of 1.7 km in Mai 2023 in the city of Jena, Germany. In a first proof-of-principle study, we were able to apply the full optical and post-processing pipeline to extract pseudo-asymptotic keys and discuss the further steps necessary to move the system to the finite-size regime. To the best of our knowledge, this is the first CVQKD demonstration over a real atmospheric channel combining both the new class of DMCVQKD security proofs without Gaussian optimality and error correction steps.
- 28-pixel parallel SNSPDs with low jitter at high detection rates for high-speed quantum communicationLorenzo Stasi (ID Quantique SA and Group of Applied Physics, University of Geneva); Towsif Taher (Group of Applied Physics, University of Geneva); Giovanni V. Resta (ID Quantique SA); Hugo Zbinden (Group of Applied Physics, University of Geneva); Robert Thew (Group of Applied Physics, University of Geneva); and Félix Bussières (ID Quantique SA)[abstract]Abstract: We report the fabrication and characterization of 28-pixel P-SNSPD, reaching 88% system detection efficiency (SDE) at the single photon level. The detector is able to detect single-photon events at 250 Mcps with 50% nominal SDE, using only a single coaxial read-out cable, and maintains a timing jitter below 80 ps until 200 Mcps. Moreover,we achieve 1 Gcps detection rates by using only 4 P-SNSPD detectors and an 1:4 commercially available optical splitter Finally, we show how the P-SNSPD architecture allows us to maintain a very low jitter even at the high detection rates. We finally analyze the PNR capability of the array and measure efficiencies of 75% at 2-photon and 60% at 3-photon at 1550nm.