Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Max Planck SocietyDE1.5k papers
- Leibniz University HannoverDE902 papers
- California Institute of TechnologyUS583 papers
- Centre National de la Recherche ScientifiqueFR534 papers
- University of BirminghamGB417 papers
- Pennsylvania State UniversityUS402 papers
- University of Maryland, College ParkUS398 papers
- Louisiana State UniversityUS394 papers
- University of Wisconsin–MilwaukeeUS390 papers
- Cardiff UniversityGB371 papers
- University of GlasgowGB367 papers
- Goddard Space Flight CenterUS340 papers
133 papers · 1 filter
Quantum Metrology for Gravitational Wave Astronomy
Roman Schnabel, Nergis Mavalvala, David E. McClelland +1
Einstein's General Theory of Relativity predicts that accelerating mass distributions produce gravitational radiation, analogous to electromagnetic radiation from accelerating char…
Detection of 15 dB Squeezed States of Light and their Application for the Absolute Calibration of Photoelectric Quantum Efficiency
Henning Vahlbruch, Moritz Mehmet, Karsten Danzmann +1
Squeezed states of light belong to the most prominent nonclassical resources. They have compelling applications in metrology, which has been demonstrated by their routine exploitat…
GHZ protocols enhance frequency metrology despite spontaneous decay
Timm Kielinski, Piet O. Schmidt, Klemens Hammerer
The use of correlated states and measurements promises improvements in the accuracy of frequency metrology and the stability of atomic clocks. However, developing strategies robust…
Particle detectors under chronological hazard
Ana Alonso-Serrano, Erickson Tjoa, Luis J. Garay +1
We analyze how the presence of closed timelike curves (CTCs) characterizing a time machine can be discerned by placing a local particle detector in a region of spacetime which is c…
Quantum enhanced balanced heterodyne readout for differential interferometry
Daniel W. Gould, Vaishali B. Adya, Sheon S. Y. Chua +8
Conventional heterodyne readout schemes are now under reconsideration due to the realization of techniques to evade its inherent 3 dB signal-to-noise penalty. The application of hi…
Macroscopic quantum entanglement between an optomechanical cavity and a continuous field in presence of non-Markovian noise
Su Direkci, Klemens Winkler, Corentin Gut +3
Probing quantum entanglement with macroscopic objects allows us to test quantum mechanics in new regimes. One way to realize such behavior is to couple a macroscopic mechanical osc…
Optimal Ramsey interferometry with echo protocols based on one-axis twisting
Maja S. Scharnagl, Timm Kielinski, Klemens Hammerer
We study a variational class of generalised Ramsey protocols that include two one-axis twisting (OAT) operations, one performed before the phase imprint and the other after. In thi…
Security of differential phase shift QKD from relativistic principles
Martin Sandfuchs, Marcus Haberland, V. Vilasini +1
The design of quantum protocols for secure key generation poses many challenges: On the one hand, they need to be practical concerning experimental realisations. On the other hand,…
All-optical coherent quantum-noise cancellation in cascaded optomechanical systems
Jakob Schweer, Daniel Steinmeyer, Klemens Hammerer +1
Coherent quantum noise cancellation (CQNC) can be used in optomechanical sensors to surpass the standard quantum limit (SQL). In this paper, we investigate an optomechanical force…
Direct observation of photon bound states using a single artificial atom
Natasha Tomm, Sahand Mahmoodian, Nadia O. Antoniadis +6
The interaction between photons and a single two-level atom constitutes a fundamental paradigm in quantum physics. The nonlinearity provided by the atom means that the light-matter…
Numerical optimization of amplitude-modulated pulses in microwave-driven entanglement generation
M. Duwe, G. Zarantonello, N. Pulido-Mateo +7
Microwave control of trapped ions can provide an implementation of high-fidelity two-qubit gates free from errors induced by photon scattering. Furthermore, microwave conductors ma…
Boundary theories of critical matchgate tensor networks
Alexander Jahn, Marek Gluza, Charlotte Verhoeven +2
Key aspects of the AdS/CFT correspondence can be captured in terms of tensor network models on hyperbolic lattices. For tensors fulfilling the matchgate constraint, these have prev…
The time traveler's guide to the quantization of zero modes
Ana Alonso-Serrano, Erickson Tjoa, Luis J. Garay +1
We study the relationship between the quantization of a massless scalar field on the two-dimensional Einstein cylinder and in a spacetime with a time machine. We find that the latt…
Approaching the motional ground state of a 10 kg object
Chris Whittle, Evan D. Hall, Sheila Dwyer +197
The motion of a mechanical object -- even a human-sized object -- should be governed by the rules of quantum mechanics. Coaxing them into a quantum state is, however, difficult: th…
Quantum Variational Optimization of Ramsey Interferometry and Atomic Clocks
Raphael Kaubruegger, Denis V. Vasilyev, Marius Schulte +2
We discuss quantum variational optimization of Ramsey interferometry with ensembles of entangled atoms, and its application to atomic clocks based on a Bayesian approach to pha…
Unraveling two-photon entanglement via the squeezing spectrum of light traveling through nanofiber-coupled atoms
Jakob Hinney, Adarsh S. Prasad, Sahand Mahmoodian +5
We observe that a weak guided light field transmitted through an ensemble of atoms coupled to an optical nanofiber exhibits quadrature squeezing. From the measured squeezing spectr…
13dB Squeezed Vacuum States at 1550nm from 12mW external pump power at 775nm
Axel Schönbeck, Fabian Thies, Roman Schnabel
Strongly squeezed light at telecommunication wavelengths is the necessary resource for one-sided device-independent quantum key distribution via fibre networks. Reducing the optica…
Quantum correlations between the light and kilogram-mass mirrors of LIGO
Haocun Yu, L. McCuller, M. Tse +196
Measurement of minuscule forces and displacements with ever greater precision encounters a limit imposed by a pillar of quantum mechanics: the Heisenberg uncertainty principle. A l…
Robust and resource-efficient microwave near-field entangling Be gate
G. Zarantonello, H. Hahn, J. Morgner +5
Microwave trapped-ion quantum logic gates avoid spontaneous emission as a fundamental source of decoherence. However, microwave two-qubit gates are still slower than laser-induced…
Connector tensor networks: a renormalization-type approach to quantum certification
Miguel Navascues, Sukhbinder Singh, Antonio Acin
As quantum technologies develop, we acquire control of an ever-growing number of quantum systems. Unfortunately, current tools to detect relevant quantum properties of quantum stat…
Continuous-wave squeezed states of light via 'up-down' self-phase modulation
Amrit Pal Singh, Stefan Ast, Moritz Mehmet +2
Continuous-wave (cw) squeezed states of light have applications in sensing, metrology and secure communication. In recent decades their efficient generation has been based on param…
Testing of Generalized Uncertainty Principle With Macroscopic Mechanical Oscillators and Pendulums
P. A. Bushev, J. Bourhill, M. Goryachev +5
Recent progress in observing and manipulating mechanical oscillators at quantum regime provides new opportunities of studying fundamental physics, for example, to search for low en…
Negative Wigner function at telecommunication wavelength from homodyne detection
Christoph Baune, Jaromir Fiurasek, Roman Schnabel
Quantum states of light having a Wigner function with negative values represent a key resource in quantum communication and quantum information processing. Here, we present the gen…
Beating the standard sensitivity-bandwidth limit of cavity-enhanced interferometers with internal squeezed-light generation
Mikhail Korobko, Lisa Kleybolte, Stefan Ast +3
The shot-noise limited peak sensitivity of cavity-enhanced interferometric measurement devices, such as gravitational-wave detectors, can be improved by increasing the cavity fines…