Publications (45)
Temporal and spectral properties of quantum light
Birgit Stiller, Ulrich Seyfarth, Gerd Leuchs
The modes of the electromagnetic field are solutions of Maxwell's equations taking into account the material boundary conditions. The field modes of classical optics - properly nor…
Brillouin-enhanced four-wave mixing with optical chiral states
Xinglin Zeng, Birgit Stiller
Brillouin-enhanced four-wave mixing - also known as Brillouin dynamic gratings - is an important nonlinear effect in photonics that couples four light waves by travelling acoustic…
Stimulated Brillouin scattering in chiral photonic crystal fiber
Xinglin Zeng, Wenbin He, Micahel H. Frosz +5
Stimulated Brillouin scattering (SBS) has many applications, for example, in sensing, microwave photonics and signal processing. Here we report the first experimental study of SBS…
Depolarized guided acoustic wave Brillouin scattering in hollow-core photonic crystal fibers
Wenjia Elser née Zhong, Birgit Stiller, Dominique Elser +3
By performing quantum-noise-limited optical heterodyne detection, we observe polarization noise in light after propagation through a hollow-core photonic crystal fiber (PCF). We co…
Risk analysis of Trojan-horse attacks on practical quantum key distribution systems
Nitin Jain, Birgit Stiller, Imran Khan +3
An eavesdropper Eve may probe a quantum key distribution (QKD) system by sending a bright pulse from the quantum channel into the system and analyzing the back-reflected pulses. Su…
On-chip broadband non-reciprocal light storage
Moritz Merklein, Birgit Stiller, Khu Vu +3
Breaking the symmetry between forward and backward propagating optical modes is of fundamental scientific interest and enables crucial functionalities, such as isolators, circulato…
Brillouin-based storage of QPSK signals with fully tunable phase retrieval
Olivia Saffer, Jesús Humberto Marines Cabello, Steven Becker +2
Photonic memory is an important building block to delay, route and buffer optical information, for instance in optical interconnects or for recurrent optical signal processing. Pho…
Highly localized Brillouin scattering response in a photonic integrated circuit
Atiyeh Zarifi, Birgit Stiller, Moritz Merklein +6
The interaction of optical and acoustic waves via stimulated Brillouin scattering (SBS) has recently reached on-chip platforms, which has opened new fields of applications ranging…
Quantum coherent control in pulsed waveguide optomechanics
Junyin Zhang, Changlong Zhu, Christian Wolff +1
Coherent control of traveling acoustic excitations in a waveguide system is an interesting way to manipulate and transduce classical and quantum information. So far, these interact…
All-optical nonlinear activation function based on stimulated Brillouin scattering
Grigorii Slinkov, Steven Becker, Dirk Englund +1
Photonic neural networks have demonstrated their potential over the past decades, but have not yet reached the full extent of their capabilities. One reason for this lies in an ess…
Nonreciprocal vortex isolator by stimulated Brillouin scattering in chiral photonic crystal fibre
Xinglin Zeng, Philip St. J. Russell, Christian Wolff +3
Optical non-reciprocity, which breaks the symmetry between forward and backward propagating optical waves, has become vital in photonic systems and enables many key devices, such a…
An optoacoustic field-programmable perceptron for recurrent neural networks
Steven Becker, Dirk Englund, Birgit Stiller
A critical feature in signal processing is the ability to interpret correlations in time series signals, such as speech. Machine learning systems process this contextual informatio…
Attacks on practical quantum key distribution systems (and how to prevent them)
Nitin Jain, Birgit Stiller, Imran Khan +3
With the emergence of an information society, the idea of protecting sensitive data is steadily gaining importance. Conventional encryption methods may not be sufficient to guarant…
Spin-orbit interaction in nanofiber-based Brillouin scattering
Maxime Zerbib, Maxime Romanet, Thibaut Sylvestre +4
Angular momentum is an important physical property that plays a key role in light-matter interactions such as spin-orbit interaction. Here, we investigate theoretically and experim…
A chip-integrated coherent photonic-phononic memory
Moritz Merklein, Birgit Stiller, Khu Vu +2
Controlling and manipulating quanta of coherent acoustic vibrations - phonons - in integrated circuits has recently drawn a lot of attention, since phonons can function as unique l…
Optical vortex Brillouin laser
Xinglin Zeng, Philip St. J. Russell, Yang Chen +5
Optical vortices, which have been extensively studied over the last decades, offer an additional degree of freedom useful in many applications, such as optical tweezers and quantum…
Classically entangled optical beams for high-speed kinematic sensing
Stefan Berg-Johansen, Falk Töppel, Birgit Stiller +6
Tracking the kinematics of fast-moving objects is an important diagnostic tool for science and engineering. Existing optical methods include high-speed CCD/CMOS imaging, streak cam…
Brillouin light storage for 100 pulse widths
Birgit Stiller, Kevin Jaksch, Johannes Piotrowski +8
Signal processing based on stimulated Brillouin scattering (SBS) is limited by the narrow linewidth of the optoacoustic response, which confines many Brillouin applications to cont…
On-chip multi-stage optical delay based on cascaded Brillouin light storage
Birgit Stiller, Moritz Merklein, Christian Wolff +5
Storing and delaying optical signals plays a crucial role in data centers, phased array antennas, communication and future computing architectures. Here, we show a delay scheme bas…
Brillouin-Mandelstam Scattering-based Cooling of Traveling Acoustic Waves from Cryogenic Temperatures
Lisa Fischer, Laura Blázquez MartÃnez, Robin Chenivière +2
Thermal phonons are a major source of decoherence in quantum mechanical systems. Operating in the quantum ground state is therefore often an experimental prerequisite. Additionally…
Efficient single sideband microwave to optical conversion using an electro-optical whispering gallery mode resonator
Alfredo Rueda, Florian Sedlmeir, Michele C. Collodo +9
Linking classical microwave electrical circuits to the optical telecommunication band is at the core of modern communication. Future quantum information networks will require coher…
Quantum-limited measurements of optical signals from a geostationary satellite
Kevin Günthner, Imran Khan, Dominique Elser +13
The measurement of quantum signals that traveled through long distances is of fundamental and technological interest. We present quantum-limited coherent measurements of optical si…
Coherently refreshed acoustic phonons for extended light storage
Birgit Stiller, Moritz Merklein, Christian Wolff +4
Acoustic waves can serve as memory for optical information, however, acoustic phonons in the GHz regime decay on the nanosecond timescale. Usually this is dominated by intrinsic ac…
A solid-state quantum memory based on a continuous optoacoustic system
Changlong Zhu, Claudiu Genes, Birgit Stiller
Quantum memories for optical states are essential resources for quantum communication and information processing. We propose a quantum memory protocol based on coherent photon-phon…
Multi-dimensional parameter space of higher-order exceptional points induced by Brillouin optoacoustics
Grigorii Slinkov, Anton Montag, Julius T. Gohsrich +4
Exceptional points (EPs) are degeneracies in the spectrum of non-Hermitian systems, where both the eigenvalues and eigenvectors coalesce. In the vicinity of an n-th order EP, the e…
Frequency conversion of vortex states by chiral forward Brillouin scattering in twisted photonic crystal fibre
Xinglin Zeng, Philip St. J. Russell, Birgit Stiller
Optical vortex states-higher optical modes with helical phase progression and carrying orbital angular momentum-have been explored to increase the flexibility and capacity of optic…
Cavity-less Brillouin strong coupling in a solid-state continuous system
Laura Blázquez MartÃnez, Changlong Zhu, Birgit Stiller
Strongly coupling two systems allows them to exchange coherent information before the systems decohere. This important regime in light-matter interactions has predominantly been re…
On-chip correlation-based Brillouin sensing: design, experiment and simulation
Atiyeh Zarifi, Birgit Stiller, Moritz Merklein +10
Wavelength-scale SBS waveguides are enabling novel on-chip functionalities. The micro- and nano-scale SBS structures and the complexity of the SBS waveguides require a characteriza…
Crosstalk-free multi-wavelength coherent light storage via Brillouin interaction
Birgit Stiller, Moritz Merklein, Khu Vu +4
Stimulated Brillouin scattering drives a coherent interaction between optical signals and acoustic phonons and this effect can be used for storing optical information in acoustic w…
Cascaded forward Brillouin scattering to all Stokes orders
Christian Wolff, Birgit Stiller, Benjamin. J. Eggleton +2
Inelastic scattering processes such as Brillouin scattering can often function in cascaded regimes and this is likely to occur in certain integrated opto-acoustic devices. We devel…
Optoacoustic cooling of traveling hypersound waves
Laura Blázquez MartÃnez, Philipp Wiedemann, Changlong Zhu +2
We experimentally demonstrate optoacoustic cooling via stimulated Brillouin-Mandelstam scattering in a 50 cm-long tapered photonic crystal fiber. For a 7.38 GHz acoustic mode, a co…
Roadmap on Neuromorphic Photonics
Daniel Brunner, Bhavin J. Shastri, Mohammed A. Al Qadasi +147
This roadmap consolidates recent advances while exploring emerging applications, reflecting the remarkable diversity of hardware platforms, neuromorphic concepts, and implementatio…
Magnon-mediated microwave to optical time dynamics
Rajkumar Jadhav, Xinglin Zeng, Cedric Traub +6
Optomagnonic modulation techniques are an emerging platform for information transfer from the microwave to the optical domain. However, these techniques focus largely on the spectr…
Optoacoustic entanglement in a continuous Brillouin-active solid state system
Changlong Zhu, Claudiu Genes, Birgit Stiller
Entanglement in hybrid quantum systems comprised of fundamentally different degrees of freedom, such as light and mechanics is of interest for a wide range of applications in quant…
Agile and versatile quantum communication: signatures and secrets
Stefan Richter, Matthew Thornton, Imran Khan +7
Agile cryptography allows for a resource-efficient swap of a cryptographic core in case the security of an underlying classical cryptographic algorithm becomes compromised. Convers…
High-speed coherent photonic random-access memory in long-lasting sound waves
Andreas Geilen, Steven Becker, Birgit Stiller
In recent years, remarkable advances in photonic computing have highlighted the need for photonic memory, particularly high-speed and coherent random-access memory. Addressing the…
Dynamic Brillouin cooling for continuous optomechanical systems
Changlong Zhu, Birgit Stiller
In general, ground state cooling using optomechanical interaction is realized in the regime where optical dissipation is higher than mechanical dissipation. Here, we demonstrate th…
Giant Brillouin gain in frozen CS2 capillaries
Simon Seiderer, Andreas Geilen, Luan N. Sliwa +5
Stimulated Brillouin-Mandelstam scattering offers exceptional capabilities for photonic signal processing, but current platforms demand performance trade-offs between long interact…
Eavesdropper localization for quantum and classical channels via nonlinear scattering
Alexandra Popp, Florian Sedlmeir, Birgit Stiller +1
Optical fiber networks are part of important critical infrastructure and known to be prone to eavesdropping attacks. Hence cryptographic methods have to be used to protect communic…
Higher-order exceptional points in a multimode continuum optoacoustic system
Anton Montag, Julius T. Gohsrich, Quentin Levoy +2
Exceptional points appear in non-Hermitian systems as degeneracies, where not only eigenvalues but also eigenvectors coalesce. They are of great theoretical and experimental intere…
Two-spin-multiplexed optoacoustic light storage in chiral photonic crystal fiber
Xinglin Zeng, Linqiao Gan, Jesús Humberto Marines Cabello +2
The ability to coherently store and manipulate optical information across multiple degrees of freedom is a central requirement for scalable quantum information processing and multi…
Brillouin spectroscopy of a hybrid silicon-chalcogenide waveguide with geometrical variations
Atiyeh Zarifi, Birgit Stiller, Moritz Merklein +10
Recent advances in design and fabrication of photonic-phononic waveguides have enabled stimulated Brillouin scattering (SBS) in silicon-based platforms, such as under-etched silico…
Satellite Quantum Communication via the Alphasat Laser Communication Terminal
Dominique Elser, Kevin Günthner, Imran Khan +12
By harnessing quantum effects, we nowadays can use encryption that is in principle proven to withstand any conceivable attack. These fascinating quantum features have been implemen…
Exploring extreme thermodynamics in nanoliter volumes through stimulated Brillouin-Mandelstam scattering
Andreas Geilen, Alexandra Popp, Debayan Das +6
Examining the physical properties of materials - particularly of toxic liquids - under a wide range of thermodynamic states is a challenging problem due to the extreme conditions t…
Picosecond acoustic dynamics in stimulated Brillouin scattering
Johannes Piotrowski, MikoÅaj K. Schmidt, Birgit Stiller +2
Recent experiments demonstrating storage of optical pulses in acoustic phonons based on stimulated Brillouin scattering raise a number of questions about the spectral and temporal…