594 citations · 2.8k across the 52 of their papers we have counts for
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Controlling rotations of magnetically levitated superconductors
Fynn Köller, Dominik Maile, Joachim Ankerhold +3
Magnetically trapped type-I superconductors are promising candidates for precision experiments at the quantum-to-classical borderline, with applications in quantum sensing of force…
Niobium Titanium Nitride as a High Tensile Stress Material for Nanomechanics
Korbinian Rubenbauer, Burak E. Bülbüloglu, Thomas Luschmann +6
Over the past decades, high-coherence mechanical resonators have been continuously pushed to new limits, using techniques such as dissipation dilution and clamp-tapering to enhance…
Macroscopic Quantum Interference of the Center-of-Mass Motion of Levitated Superconducting Microparticles enabled by Magnetic Higher-Order Traps
Jaume Cunill-Subiranas, Fabian Resare, Suocheng Zhao +4
We show how magnetostatic higher-order multipole traps can be used to generate macroscopic quantum interference of the motion of levitated superconducting microparticles. An approp…
Nonlinear quantum optomechanics in a Fano-mirror microcavity system
Lei Du, Juliette Monsel, Witlef Wieczorek +1
We study a Fano-mirror optomechanical system in the quantum nonlinear regime. In this system, two strongly lossy optical modes hybridize through both coherent and dissipative coupl…
Efficient flip-chip and on-chip-based modulation of flux-tunable superconducting resonators
Achintya Paradkar, Paul Nicaise, Karim Dakroury +5
We demonstrate the efficient modulation of flux-tunable superconducting resonators (FTRs) using flip-chip or on-chip-based input coils. The FTRs we use are aluminum-based quarter-w…
Coherent feedback control for cavity optomechanical systems with a frequency-dependent mirror
Lei Du, Juliette Monsel, Witlef Wieczorek +1
Ground-state cooling of mechanical resonators is a prerequisite for the observation of various quantum effects in optomechanical systems and thus has always been a crucial task in…
High-Q magnetic levitation and control of superconducting microspheres at millikelvin temperatures
Joachim Hofer, Rudolf Gross, Gerard Higgins +11
We report the levitation of a superconducting lead-tin sphere with 100 micrometer diameter (corresponding to a mass of 5.6 micrograms) in a static magnetic trap formed by two coils…
Superconducting microsphere magnetically levitated in an anharmonic potential with integrated magnetic readout
Martí Gutierrez Latorre, Gerard Higgins, Achintya Paradkar +2
Magnetically levitated superconducting microparticles offer a promising path to quantum experiments with picogram to microgram objects. In this work, we levitate a 700ng $\sim 10^{…
Optomechanical cooling with coherent and squeezed light: the thermodynamic cost of opening the heat valve
Juliette Monsel, Nastaran Dashti, Sushanth Kini Manjeshwar +6
Ground-state cooling of mechanical motion by coupling to a driven optical cavity has been demonstrated in various optomechanical systems. In our work, we provide a so far missing t…
Cavity Optomechanics with Photonic Bound States in the Continuum
Jamie M. Fitzgerald, Sushanth Kini Manjeshwar, Witlef Wieczorek +1
We propose a versatile, free-space cavity optomechanics platform built from two photonic crystal membranes, one of which is freely suspended, and designed to form a microcavity les…
Stationary optomechanical entanglement between a mechanical oscillator and its measurement apparatus
C. Gut, K. Winkler, J. Hoelscher-Obermaier +9
We provide an argument to infer stationary entanglement between light and a mechanical oscillator based on continuous measurement of light only. We propose an experimentally realiz…
Optimal Control of Hybrid Optomechanical Systems for Generating Non-Classical States of Mechanical Motion
Ville Bergholm, Witlef Wieczorek, Thomas Schulte-Herbrueggen +1
Cavity optomechanical systems are one of the leading experimental platforms for controlling mechanical motion in the quantum regime. We exemplify that the control over cavity optom…
Electro-mechanical Casimir effect
Mikel Sanz, Witlef Wieczorek, Simon Gröblacher +1
The dynamical Casimir effect is an intriguing phenomenon in which photons are generated from vacuum due to a non-adiabatic change in some boundary conditions. In particular, it con…
Interferometric autocorrelation in the ultra-violet utilizing spontaneous parametric down-conversion
Patrick Michelberger, Roland Krischek, Witlef Wieczorek +2
Autocorrelation is a common method to estimate the duration of ultra-short laser pulses. In the ultra-violet (UV) regime it is increasingly challenging to employ the standard proce…
Ultrasensitive Inertial and Force Sensors with Diamagnetically Levitated Magnets
J. Prat-Camps, C. Teo, C. C. Rusconi +2
We theoretically show that a magnet can be stably levitated on top of a punctured superconductor sheet in the Meissner state without applying any external field. The trapping poten…
Experimental determination of irreversible entropy production in out-of-equilibrium mesoscopic quantum systems
M. Brunelli, L. Fusco, R. Landig +9
By making use of a recently proposed framework for the inference of thermodynamic irreversibility in bosonic quantum systems, we experimentally measure and characterize the entropy…
Optimal state estimation for cavity optomechanical systems
Witlef Wieczorek, Sebastian G. Hofer, Jason Hoelscher-Obermaier +3
We demonstrate optimal state estimation for a cavity optomechanical system through Kalman filtering. By taking into account nontrivial experimental noise sources, such as colored l…
Highly efficient heralding of entangled single photons
Sven Ramelow, Alexandra Mech, Marissa Giustina +8
Single photons are an important prerequisite for a broad spectrum of quantum optical applications. We experimentally demonstrate a heralded single-photon source based on spontaneou…
Useful Multiparticle Entanglement and Sub-Shot-Noise Sensitivity in Experimental Phase Estimation
Roland Krischek, Christian Schwemmer, Witlef Wieczorek +4
We experimentally demonstrate a general criterion to identify entangled states useful for the estimation of an unknown phase shift with a sensitivity higher than the shot-noise lim…
Quantum entanglement and teleportation in pulsed cavity-optomechanics
Sebastian G. Hofer, Witlef Wieczorek, Markus Aspelmeyer +1
Entangling a mechanical oscillator with an optical mode is an enticing and yet a very challenging goal in cavity optomechanics. Here we consider a pulsed scheme to create Einstein-…
Pulsed Laser Cooling for Cavity-Optomechanical Resonators
Shai Machnes, Javier Cerrillo, Markus Aspelmeyer +3
A pulsed cooling scheme for optomechanical systems is presented that is capable of cooling at much faster rates, shorter overall cooling times, and for a wider set of experimental…
Fisher information and multiparticle entanglement
Philipp Hyllus, Wiesław Laskowski, Roland Krischek +5
The Fisher information gives a limit to the ultimate precision achievable in a phase estimation protocol. It has been shown recently that the Fisher information for a linear tw…
Permutationally invariant quantum tomography
Geza Toth, Witlef Wieczorek, David Gross +3
We present a scalable method for the tomography of large multiqubit quantum registers. It acquires information about the permutationally invariant part of the density operator, whi…
Non-classicality thresholds for multiqubit states - numerical analysis
Jacek Gruca, Wieslaw Laskowski, Marek Zukowski +4
States that strongly violate Bell's inequalities are required in many quantum informational protocols as, for example, in cryptography, secret sharing and the reduction of communic…