QuantumFrontiers Newsletter #17 (Mar 2024)

Integrated light as a key to future computers
While computer chips are getting smaller and faster every year, one challenge remains unsolved: combining electronics and photonics on a single chip. In the OptoGaN project, researchers from the TU Braunschweig and the Friedrich Schiller University Jena are working on a new type of etching process, that could be the decisive breakthrough for combining light sources and optical fibres.

APS March Meeting 2024 in Minneapolis
As one of eight members of the Quantum Alliance, QuantumFrontiers represented Germany’s research in the fields of quantum science and technologies from 3 to 8 March in Minneapolis at the March Meeting of the American Physical Society.

Diversity, Equity & Inclusion
QuantumFrontiers wants to focus more on equity and diversity in the cluster and how we achieve structural change. Learn about our cluster values: On the revised website, we have compiled all the relevant information as well as news, events and contacts. Also: We're looking for Diversity Ambassadors who are willing to spread the word and work together with DEI Coordinator Janna-Lee Steenblock. Please get in contact if interested!

One-of-a-kind atomic gravimeter comparison at HITec
Researchers and manufacturers from Germany, France, Italy, Poland and the USA therefore met at the Hannover Institute for Technology (HITec) at the end of January for a workshop and a comparison campaign with five commercially available atomic quantum gravimeters. The aim of this unique campaign was to test the measurement accuracy and consistency of the various devices and bring users one step closer to application.

QuantumFrontiers at Hannover Messe
QuantumFrontiers is part of the QVLS pavilion at Hannover Messe 2024 and members are cordially invited to visit our booth. Register here for a free day ticket.

ESA gives go-ahead for flagship gravitational-wave observatory in space
LISA, the Laser Interferometer Space Antenna, has passed a major review with flying colours: the entire concept – from the definition of the overall mission and operations to the space hardware to be built – stood up to the intense scrutiny of ESA’s reviewers. Now the space agency’s Science Programme Committee (SPC) has confirmed that LISA is sufficiently mature and that mission development can proceed as planned. LISA should go into orbit in the mid 2030s.

Open day at Braunschweig's electrical engineering
around 60 pupils explored the wide range of opportunities in electrical engineering at TU Braunschweig. In addition to institutes for high-voltage, communications technology and control engineering, the LENA research centre also opened its doors to young people in years 9 to 12 and provided an introduction to the topics of the QuantumFrontiers Cluster of Excellence.

Upcoming Meetings

QuantumFrontiers Days 2024
The QuantumFrontiers Days are devoted to the science within the cluster and internal and external networking and exchange. It will be held on May 27 and 28, 2024 at the Maritim Airport Hotel Hannover. The final programme will be announced before the event.

Research Highlights

Relativistically accurate - measuring height differences with atomic clocks
Optical clocks measure differences in the Earth's gravitational field and thus open up new applications in geodesy

Entanglement dynamics of photon pairs and quantum memories in the gravitational field of the earth
Researchers from ZARM present the first analysis of relativistic gravitational effects on space-based quantum memories which are expected to be an important ingredient for global quantum communication networks.

Do you have a research highlight you'd like to add to the QF Website and announce in the Newsletter? Please contact office@quantumfrontiers.uni-hannover.de.

Awards

Alexander von Humboldt Professorship for Daniel Prades and Robert Raußendorf
The twelve Humboldt Professorships 2024, Germany's most highly endowed research award, were presented by the Alexander von Humboldt Foundation in Berlin on 13 May. Two of the professorships, Daniel Prades and Robert Raußendorf, will strengthen the QuantumFrontiers Cluster of Excellence at the Universities of Braunschweig and Hanover.

Kekulé scholarship for Tim Seifert
The Kekulé Scholarship from the Fonds der Chemischen Industrie (FCI) supports highly talented young scientists in chemistry and chemistry-related subjects for two years. In addition to outstanding academic achievements within the standard period of study, the FCI requires the recipient to be working on a doctorate in a scientifically renowned research group.

Recent publications

Arazo M, Gallemí A, Guilleumas M, Mayol R and Santos L
Self-bound crystals of antiparallel dipolar mixtures
Physical Review Research, 5(4) (2023)

Roy Barzel, Mustafa Gündoğan, Markus Krutzik, Dennis Rätzel, and Claus Lämmerzahl
Entanglement dynamics of photon pairs and quantum memories in the gravitational field of the earth
Quantum 8, 1273 (2024)

Bondza SA, Leopold T, Schwarz R and Lisdat C
Achromatic, planar Fresnel-reflector for a single-beam magneto-optical trap
Review of Scientific Instruments, 95(1) (2024)

Cieślik A, Hackmann E and Mach P
Kerr geodesics in terms of Weierstrass elliptic functions
Physical Review D, 108(2) (2023)

Frost TC
Gravitational lensing of massive particles in the charged NUT spacetime
Physical Review D, 108(12) (2023).

Herbst A, Estrampes T, Albers H, Vollenkemper V, Stolzenberg K, Bode S, Charron E, Rasel EM, Gaaloul N and Schlippert D
High-flux source system for matter-wave interferometry exploiting tunable interactions
Physical Review Research, 6(1) (2024)

Hetzel M, Pezzè L, Pür C, Quensen M, Hüper A, Geng J, Kruse J, Santos L, Ertmer W, Smerzi A and Klempt C
Tomography of a Number-Resolving Detector by Reconstruction of an Atomic Many-Body Quantum State
Physical Review Letters, 131(26) (2023)

Lämmerzahl C and Perlick V
Potentials for general-relativistic geodesy
Physical Review D, Vol. 109(4) (2024)

Manglano Clavero I, Margenfeld C, Hartmann J and Waag A
Reshaping of 3D GaN Structures during Annealing: Phenomenological Description and Mathematical Model
Crystal Growth & Design, Vol. 24(1) (2023)

Meyer-Hoppe B, Anders F, Feldmann P, Santos L and Klempt C
Excited-State Phase Diagram of a Ferromagnetic Quantum Gas
Physical Review Letters, 131(24) (2023)

Morais PH, Lobo IP, Pfeifer C, Alves Batista R and Bezerra VB
Modified particle lifetimes as a signature of deformed relativity
Physics Letters B, 848, 138380 (2024)

Pichery A, Meister M, Piest B, Böhm J, Rasel EM, Charron E and Gaaloul N
Efficient numerical description of the dynamics of interacting multispecies quantum gases
AVS Quantum Science, 5(4) (2023)

Raudonis M, Roura A, Meister M, Lotz C, Overmeyer L, Herrmann S, Gierse A, Lämmerzahl C, Bigelow NP, Lachmann M, Piest B, Gaaloul N, Rasel EM, Schubert C, Herr W, Deppner C, Ahlers H, Ertmer W, R Williams J, Lundblad N and Wörner L
Microgravity facilities for cold atom experiments
Quantum Science and Technology, 8(4), 044001 (2023)

Shammout B, Karpa L, Ospelkaus S, Tiemann E and Dulieu O
Modeling Photoassociative Spectra of Ultracold NaK + K
The Journal of Physical Chemistry A, 127(38) (2023)

Sterin P, Hühn K, Glazov MM, Hübner J and Oestreich M
Two-way photoeffectlike occupancy dynamics in a single (InGa)As quantum dot
Physical Review B, 108(12) (2023)

Stottmeister A and Osborne TJ
On the renormalization group fixed point of the two-dimensional Ising model at criticality
Scientific Reports, 13(1) (2023)

Wolf F, Heip JC, Zawierucha MJ, Shi C, Ospelkaus S and Schmidt PO
Prospect for precision quantum logic spectroscopy of vibrational overtone transitions in molecular oxygen ions
New Journal of Physics, Vol. 26(1), 013028 (2024)

Wu X, Borca B, Sen S, Koslowski S, Abb S, Rosenblatt DP, Gallardo A, Mendieta-Moreno JI, Nachtigall M, Jelinek P, Rauschenbach S, Kern K and Schlickum U
Molecular sensitised probe for amino acid recognition within peptide sequences
Nature Communications, 14(1) (2023)

Xu S, Li R, Xia Y, Siercke M and Ospelkaus S
Blue-detuned molecular magneto-optical trap schemes based on Bayesian optimization
Physical Review A, 108(3) (2023)

Yeh C-H, Grensemann KC, Dreissen LS, Fürst HA and Mehlstäubler TE
Robust and scalable rf spectroscopy in first-order magnetic sensitive states at second-long coherence time
New Journal of Physics, 25(9), 093054 (2023)

Zhang M, Müller J and Biskupek L
Advantages of combining Lunar Laser Ranging and Differential Lunar Laser Ranging
Astronomy & Astrophysics, 681 (2023)

Zhao M, Tao Y, Weber K, Kaune T, Schuster S, Hao Z and Wanner G
Method Comparison for Simulating Non-Gaussian Beams and Diffraction for Precision Interferometry
Sensors, 23(22), 9024 (2023)

Funding opportunities

Internal: Next round of Flexible Fund proposals
The next Flexible Funds round will take place at the Science Board Meeting on 3 June. Proposal deadlines will be announced well in advance.