509 citations · 1.6k across the 39 of their papers we have counts for
39 papers
Beyond Antibunching: Photon Correlation Analysis Reveals Blinking Origin
Patricia Kallert, Santiago Bermúdez-Feijóo, Giorgio De Pascalis +18
A variety of quantum emitters compete in the quest for the best single-photon source for photonic quantum technologies. Consequently, only a consistent approach to analyze the seco…
Quantum survival in hybrid pursuit dynamics - a lion chasing a lamb problem
P. Held, İ. Yalçınkaya, F. Pegoraro +10
Measurement and classical randomness usually degrade coherence; controlling where and when a subsystem is monitored can instead make them a tunable resource. We introduce a photoni…
Dynamic conditioning of two particle discrete-time quantum walks
Federico Pegoraro, Philip Held, Sonja Barkhofen +2
In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum informati…
Experimental Observation of Topological Quantum Criticality
Sonja Barkhofen, Syamsundar De, Jan Sperling +5
We report on the observation of quantum criticality forming at the transition point between topological Anderson insulator phases in a one-dimensional photonic quantum walk with sp…
Realization of high-fidelity unitary operations on up to 64 frequency bins
Syamsundar De, Vahid Ansari, Jan Sperling +3
The ability to apply user-chosen large-scale unitary operations with high fidelity to a quantum state is key to realizing future photonic quantum technologies. Here, we realize the…
Semiclassical Formulae For Wigner Distributions
Sonja Barkhofen, Philipp Schütte, Tobias Weich
In this paper we give an overview over some aspects of the modern mathematical theory of Ruelle resonances for chaotic, i.e. uniformly hyperbolic, dynamical systems and their impli…
Meromorphic Continuation of Weighted Zeta Functions on Open Hyperbolic Systems
Sonja Barkhofen, Philipp Schütte, Tobias Weich
In this article we prove meromorphic continuation of weighted zeta functions in the framework of open hyperbolic systems by using the meromorphically continued restricted resolvent…
Driven Gaussian quantum walks
Philip Held, Melanie Engelkemeier, Syamsundar De +3
Quantum walks function as essential means to implement quantum simulators, allowing one to study complex and often directly inaccessible quantum processes in controllable systems.…
Climbing the Fock ladder: Advancing multiphoton state generation
M. Engelkemeier, J. Sperling, J. Tiedau +5
A scheme for the enhanced generation of higher photon-number states is realized, using an optical time-multiplexing setting that exploits a parametric down-conversion source for an…
Experimental entanglement characterization of two-rebit states
Nidhin Prasannan, Syamsundar De, Sonja Barkhofen +3
We characterize entanglement subject to its definition over real and complex, composite quantum systems. In particular, a method is established to assess quantum correlations with…
Probing the topological Anderson transition with quantum walks
Dmitry Bagrets, Kun Woo Kim, Sonja Barkhofen +5
We consider one-dimensional quantum walks in optical linear networks with synthetically introduced disorder and tunable system parameters allowing for the engineered realization of…
Subdiffusion via Disordered Quantum Walks
Andrea Geraldi, Syamsundar De, Alessandro Laneve +4
Transport phenomena play a crucial role in modern physics and applied sciences. Examples include the dissipation of energy across a large system, the distribution of quantum inform…
Local versus Global Two-Photon Interference in Quantum Networks
Thomas Nitsche, Syamsundar De, Sonja Barkhofen +6
We devise an approach to characterizing the intricate interplay between classical and quantum interference of two-photon states in a network, which comprises multiple time-bin mode…
Experimental Control of the Degree of Non-Classicality via Quantum Coherence
Andrea Smirne, Thomas Nitsche, Dario Egloff +6
The origin of non-classicality in physical systems and its connection to distinctly quantum features such as entanglement and coherence is a central question in quantum physics. Th…
Scalable generation of multi-photon entangled states by active feed-forward and multiplexing
Evan Meyer-Scott, Nidhin Prasannan, Ish Dhand +6
Multi-photon entangled states of light are key to advancing quantum communication, computation, and metrology. Current methods for building such states are based on stitching toget…
Wave-particle duality revisited: Neither wave nor particle
Jan Sperling, Syamsundar De, Thomas Nitsche +4
A textbook interpretation of quantum physics is that quantum objects can be described in a particle or a wave picture, depending on the operations and measurements performed. Beyon…
Eigenvalue Measurement of Topologically Protected Edge states in Split-Step Quantum Walks
Thomas Nitsche, Tobias Geib, Christoph Stahl +5
We study topological phenomena of quantum walks by implementing a novel protocol that extends the range of accessible properties to the eigenvalues of the walk operator. To this en…
Experimental Reconstruction of Entanglement Quasiprobabilities
J. Sperling, E. Meyer-Scott, S. Barkhofen +2
We report on the first experimental reconstruction of an entanglement quasiprobability. In contrast to related techniques, the negativities in our distributions are a necessary and…
Photonic quantum walks with four-dimensional coins
Lennart Lorz, Evan Meyer-Scott, Thomas Nitsche +5
The dimensionality of the internal coin space of discrete-time quantum walks has a strong impact on the complexity and richness of the dynamics of quantum walkers. While two-dimens…
High-performance source of spectrally pure, polarization entangled photon pairs based on hybrid integrated-bulk optics
Evan Meyer-Scott, Nidhin Prasannan, Christof Eigner +4
Entangled photon pair sources based on bulk optics are approaching optimal design and implementation, with high state fidelities, spectral purities and heralding efficiencies, but…
A high dynamic range optical detector for measuring single photons and bright light
Johannes Tiedau, Evan Meyer-Scott, Thomas Nitsche +3
Detecting light is fundamental to all optical experiments and applications. At the single photon level, the quantised nature of light requires specialised detectors, which typicall…
Supersymmetric polarization anomaly in photonic discrete-time quantum walks
Sonja Barkhofen, Lennart Lorz, Thomas Nitsche +2
Quantum anomalies lead to finite expectation values that defy the apparent symmetries of a system. These anomalies are at the heart of topological effects in fundamental, electroni…
Probing Measurement Induced Effects in Quantum Walks via Recurrence
Thomas Nitsche, Sonja Barkhofen, Regina Kruse +7
Measurements on a quantum particle unavoidably affect its state, since the otherwise unitary evolution of the system is interrupted by a non-unitary projection operation. In order…
A detailed study of Gaussian Boson Sampling
Regina Kruse, Craig S. Hamilton, Linda Sansoni +3
Since the development of Boson sampling, there has been a quest to construct more efficient and experimentally feasible protocols to test the computational complexity of sampling f…