96 citations · 387 across the 24 of their papers we have counts for
25 papers
Probabilistic generation of two-mode binomial cat states using cross-Kerr interactions
S. Zhao, A. Metelmann, S. Qvarfort
Superpositions of macroscopically distinct coherent states, or cat states, are a key resource for quantum technologies. In particular, two-mode binomial cat states can give rise to…
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…
Gravitational wave imprints on spontaneous emission
Jerzy Paczos, Navdeep Arya, Sofia Qvarfort +2
Despite growing interest, there is a scarcity of known predictions in the regime where both quantum and general relativistic effects become observable. Here, we investigate a combi…
Quantum metasurfaces as probes of vacuum particle content
Germain Tobar, Joshua Foo, Sofia Qvarfort +3
The quantum vacuum of the electromagnetic field is inherently entangled across distinct spatial sub-regions, resulting in entangled particle content across these sub-regions. Howev…
Optimizing confidence in negative-partial-transpose-based entanglement criteria
Lydia A. Kanari-Naish, Jack Clarke, Sofia Qvarfort +1
A key requirement of any separable quantum state is that its density matrix has a positive partial transpose. For continuous bipartite quantum states, violation of this condition m…
Metrology of Gravitational Effects with Mechanical Quantum Systems
Daniel Braun, Marta Maria Marchese, Stefan Nimmrichter +3
Mechanical quantum systems, such as resonators and levitated particles, offer unique opportunities for quantum metrology. Particularly, their significant mass and quantum-level con…
Sensing force gradients with cavity optomechanics while evading backaction
Elisabet K. Arvidsson, Ermes Scarano, August K. Roos +2
We study force-gradient sensing with a coherently driven mechanical resonator and phase-sensitive detection of motion through the two-tone backaction evading measurement of cavity…
Fast and robust cat state preparation utilizing higher order nonlinearities in Rydberg ensembles
S. Zhao, M. G. Krauss, T. Bienaime +4
In optical and solid-state architectures, low-order nonlinearities are commonly exploited for quantum state preparation due to their practical accessibility and controllability, wh…
Massive quantum systems as interfaces of quantum mechanics and gravity
Sougato Bose, Ivette Fuentes, Andrew A. Geraci +7
The traditional view from particle physics is that quantum gravity effects should only become detectable at extremely high energies and small length scales. Due to the significant…
Enhanced optomechanical nonlinearity through non-Markovian mechanical noise
Sofia Qvarfort
Cavity optomechanical systems in the quantum regime consist of a cavity mode and mechanical element coupled together through radiation pressure. In the nonlinear optomechanical reg…
Exceptional points and exponential sensitivity for periodically driven Lindblad equations
Jonas Larson, Sofia Qvarfort
In this contribution to the memorial issue of Göran Lindblad, we investigate the periodically driven Lindblad equation for a two-level system. We analyze the system using both adia…
Fast Optomechanical Photon Blockade
Yuxun Ling, Sofia Qvarfort, Florian Mintert
The photon blockade effect is commonly exploited in the development of single-photon sources. While the photon blockade effect could be used to prepare high-fidelity single-photon…
Solving quantum dynamics with a Lie algebra decoupling method
Sofia Qvarfort, Igor Pikovski
At the heart of quantum technology development is the control of quantum systems at the level of individual quanta. Mathematically, this is realised through the study of Hamiltonia…
Optimal quantum parametric feedback cooling
Sreenath K. Manikandan, Sofia Qvarfort
We propose an optimal protocol using phase-preserving quantum measurements and phase-dependent modulations of the trapping potential at parametric resonance to cool a quantum oscil…
Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
Lydia A. Kanari-Naish, Jack Clarke, Sofia Qvarfort +1
Cavity quantum optomechanics has emerged as a new platform for quantum science and technology with applications ranging from quantum-information processing to tests of the foundati…
Constraining modified gravity with quantum optomechanics
Sofia Qvarfort, Dennis Rätzel, Stephen Stopyra
We derive the best possible bounds that can be placed on Yukawa- and chameleon-like modifications to the Newtonian gravitational potential with a cavity optomechanical quantum sens…
Master-equation treatment of nonlinear optomechanical systems with optical loss
Sofia Qvarfort, Michael R. Vanner, P. F. Barker +1
Open-system dynamics play a key role in the experimental and theoretical study of cavity optomechanical systems. In many cases, the quantum Langevin equations have enabled excellen…
Optimal estimation of time-dependent gravitational fields with quantum optomechanical systems
Sofia Qvarfort, A. Douglas K. Plato, David Edward Bruschi +4
We study the fundamental sensitivity that can be achieved with an ideal optomechanical system in the nonlinear regime for measurements of time-dependent gravitational fields. Using…
Quantum metrology with optomechanical systems in the nonlinear regime
Sofia Qvarfort
This thesis focuses on the mathematical description and application of nonlinear cavity optomechanical systems. The first part is concerned with solving the dynamics of the standar…
Hydrogenic entanglement
Sofia Qvarfort, Sougato Bose, Alessio Serafini
Is there any entanglement in the simplest ubiquitous bound system? We study the solutions to the time-independent Schrödinger equation for a Hydrogenic system and devise two entang…
Optimal estimation with quantum optomechanical systems in the nonlinear regime
Fabienne Schneiter, Sofia Qvarfort, Alessio Serafini +4
We study the fundamental bounds on precision measurements of parameters contained in a time-dependent nonlinear optomechanical Hamiltonian, which includes the nonlinear light-matte…
Time-evolution of nonlinear optomechanical systems: Interplay of mechanical squeezing and non-Gaussianity
Sofia Qvarfort, Alessio Serafini, André Xuereb +3
We solve the time evolution of a nonlinear optomechanical Hamiltonian with arbitrary time-dependent mechanical displacement, mechanical single-mode squeezing and a time-dependent o…
Mesoscopic entanglement through central potential interactions
Sofia Qvarfort, Sougato Bose, Alessio Serafini
The generation and detection of entanglement between mesoscopic systems would have major fundamental and applicative implications. In this work, we demonstrate the utility of conti…
Enhanced continuous generation of non-Gaussianity through optomechanical modulation
Sofia Qvarfort, Alessio Serafini, André Xuereb +2
We study the non-Gaussian character of quantum optomechanical systems evolving under the fully nonlinear optomechanical Hamiltonian. By using a measure of non-Gaussianity based on…